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asm-generic: mmu-context cleanup

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This is a cleanup series from Nicholas Piggin, preparing for
 later changes. The asm/mmu_context.h header are generalized
 and common code moved to asm-gneneric/mmu_context.h.
 
 This saves a bit of code and makes it easier to change in
 the future.
 
 Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Merge tag 'asm-generic-mmu-context-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pull asm-generic mmu-context cleanup from Arnd Bergmann:
 "This is a cleanup series from Nicholas Piggin, preparing for later
  changes. The asm/mmu_context.h header are generalized and common code
  moved to asm-gneneric/mmu_context.h.

  This saves a bit of code and makes it easier to change in the future"

* tag 'asm-generic-mmu-context-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (25 commits)
  h8300: Fix generic mmu_context build
  m68k: mmu_context: Fix Sun-3 build
  xtensa: use asm-generic/mmu_context.h for no-op implementations
  x86: use asm-generic/mmu_context.h for no-op implementations
  um: use asm-generic/mmu_context.h for no-op implementations
  sparc: use asm-generic/mmu_context.h for no-op implementations
  sh: use asm-generic/mmu_context.h for no-op implementations
  s390: use asm-generic/mmu_context.h for no-op implementations
  riscv: use asm-generic/mmu_context.h for no-op implementations
  powerpc: use asm-generic/mmu_context.h for no-op implementations
  parisc: use asm-generic/mmu_context.h for no-op implementations
  openrisc: use asm-generic/mmu_context.h for no-op implementations
  nios2: use asm-generic/mmu_context.h for no-op implementations
  nds32: use asm-generic/mmu_context.h for no-op implementations
  mips: use asm-generic/mmu_context.h for no-op implementations
  microblaze: use asm-generic/mmu_context.h for no-op implementations
  m68k: use asm-generic/mmu_context.h for no-op implementations
  ia64: use asm-generic/mmu_context.h for no-op implementations
  hexagon: use asm-generic/mmu_context.h for no-op implementations
  csky: use asm-generic/mmu_context.h for no-op implementations
  ...
This commit is contained in:
Linus Torvalds 2020-12-15 23:58:04 -08:00
commit 157807123c
31 changed files with 183 additions and 277 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/alpha/include/asm/mmu_context.h
View File

@ -214,8 +214,6 @@ ev4_activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
tbiap();
}
#define deactivate_mm(tsk,mm) do { } while (0)
#ifdef CONFIG_ALPHA_GENERIC
# define switch_mm(a,b,c) alpha_mv.mv_switch_mm((a),(b),(c))
# define activate_mm(x,y) alpha_mv.mv_activate_mm((x),(y))
@ -229,6 +227,7 @@ ev4_activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
# endif
#endif
#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@ -242,12 +241,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}
extern inline void
destroy_context(struct mm_struct *mm)
{
/* Nothing to do. */
}
#define enter_lazy_tlb enter_lazy_tlb
static inline void
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
@ -255,6 +249,8 @@ enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
= ((unsigned long)mm->pgd - IDENT_ADDR) >> PAGE_SHIFT;
}
#include <asm-generic/mmu_context.h>
#ifdef __MMU_EXTERN_INLINE
#undef __EXTERN_INLINE
#undef __MMU_EXTERN_INLINE

17
arch/arc/include/asm/mmu_context.h
View File

@ -102,6 +102,7 @@ set_hw:
* Initialize the context related info for a new mm_struct
* instance.
*/
#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@ -113,6 +114,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}
#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
unsigned long flags;
@ -153,13 +155,13 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
/*
* Called at the time of execve() to get a new ASID
* Note the subtlety here: get_new_mmu_context() behaves differently here
* vs. in switch_mm(). Here it always returns a new ASID, because mm has
* an unallocated "initial" value, while in latter, it moves to a new ASID,
* only if it was unallocated
* activate_mm defaults (in asm-generic) to switch_mm and is called at the
* time of execve() to get a new ASID Note the subtlety here:
* get_new_mmu_context() behaves differently here vs. in switch_mm(). Here
* it always returns a new ASID, because mm has an unallocated "initial"
* value, while in latter, it moves to a new ASID, only if it was
* unallocated
*/
#define activate_mm(prev, next) switch_mm(prev, next, NULL)
/* it seemed that deactivate_mm( ) is a reasonable place to do book-keeping
* for retiring-mm. However destroy_context( ) still needs to do that because
@ -168,8 +170,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* there is a good chance that task gets sched-out/in, making it's ASID valid
* again (this teased me for a whole day).
*/
#define deactivate_mm(tsk, mm) do { } while (0)
#define enter_lazy_tlb(mm, tsk)
#include <asm-generic/mmu_context.h>
#endif /* __ASM_ARC_MMU_CONTEXT_H */

26
arch/arm/include/asm/mmu_context.h
View File

@ -26,6 +26,8 @@ void __check_vmalloc_seq(struct mm_struct *mm);
#ifdef CONFIG_CPU_HAS_ASID
void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk);
#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@ -92,32 +94,10 @@ static inline void finish_arch_post_lock_switch(void)
#endif /* CONFIG_MMU */
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
return 0;
}
#endif /* CONFIG_CPU_HAS_ASID */
#define destroy_context(mm) do { } while(0)
#define activate_mm(prev,next) switch_mm(prev, next, NULL)
/*
* This is called when "tsk" is about to enter lazy TLB mode.
*
* mm: describes the currently active mm context
* tsk: task which is entering lazy tlb
* cpu: cpu number which is entering lazy tlb
*
* tsk->mm will be NULL
*/
static inline void
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
/*
* This is the actual mm switch as far as the scheduler
* is concerned. No registers are touched. We avoid
@ -149,6 +129,6 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
#endif
}
#define deactivate_mm(tsk,mm) do { } while (0)
#include <asm-generic/mmu_context.h>
#endif

8
arch/arm64/include/asm/mmu_context.h
View File

@ -174,9 +174,9 @@ static inline void cpu_replace_ttbr1(pgd_t *pgdp)
* Setting a reserved TTBR0 or EPD0 would work, but it all gets ugly when you
* take CPU migration into account.
*/
#define destroy_context(mm) do { } while(0)
void check_and_switch_context(struct mm_struct *mm);
#define init_new_context(tsk, mm) init_new_context(tsk, mm)
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@ -208,6 +208,7 @@ static inline void update_saved_ttbr0(struct task_struct *tsk,
}
#endif
#define enter_lazy_tlb enter_lazy_tlb
static inline void
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
@ -248,15 +249,14 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
update_saved_ttbr0(tsk, next);
}
#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm(prev,next) switch_mm(prev, next, current)
void verify_cpu_asid_bits(void);
void post_ttbr_update_workaround(void);
unsigned long arm64_mm_context_get(struct mm_struct *mm);
void arm64_mm_context_put(struct mm_struct *mm);
#include <asm-generic/mmu_context.h>
#endif /* !__ASSEMBLY__ */
#endif /* !__ASM_MMU_CONTEXT_H */

6
arch/c6x/include/asm/mmu_context.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef _ASM_C6X_MMU_CONTEXT_H
#define _ASM_C6X_MMU_CONTEXT_H
#include <asm-generic/nommu_context.h>
#endif /* _ASM_C6X_MMU_CONTEXT_H */

8
arch/csky/include/asm/mmu_context.h
View File

@ -24,11 +24,6 @@
#define cpu_asid(mm) (atomic64_read(&mm->context.asid) & ASID_MASK)
#define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.asid, 0); 0; })
#define activate_mm(prev,next) switch_mm(prev, next, current)
#define destroy_context(mm) do {} while (0)
#define enter_lazy_tlb(mm, tsk) do {} while (0)
#define deactivate_mm(tsk, mm) do {} while (0)
void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
@ -46,4 +41,7 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
flush_icache_deferred(next);
}
#include <asm-generic/mmu_context.h>
#endif /* __ASM_CSKY_MMU_CONTEXT_H */

6
arch/h8300/include/asm/mmu_context.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef _ASM_H8300_MMU_CONTEXT_H
#define _ASM_H8300_MMU_CONTEXT_H
#include <asm-generic/nommu_context.h>
#endif /* _ASM_H8300_MMU_CONTEXT_H */

33
arch/hexagon/include/asm/mmu_context.h
View File

@ -15,39 +15,13 @@
#include <asm/pgalloc.h>
#include <asm/mem-layout.h>
static inline void destroy_context(struct mm_struct *mm)
{
}
/*
* VM port hides all TLB management, so "lazy TLB" isn't very
* meaningful. Even for ports to architectures with visble TLBs,
* this is almost invariably a null function.
*
* mm->context is set up by pgd_alloc, so no init_new_context required.
*/
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
/*
* Architecture-specific actions, if any, for memory map deactivation.
*/
static inline void deactivate_mm(struct task_struct *tsk,
struct mm_struct *mm)
{
}
/**
* init_new_context - initialize context related info for new mm_struct instance
* @tsk: pointer to a task struct
* @mm: pointer to a new mm struct
*/
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
/* mm->context is set up by pgd_alloc */
return 0;
}
/*
* Switch active mm context
@ -74,6 +48,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
/*
* Activate new memory map for task
*/
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
unsigned long flags;
@ -86,4 +61,6 @@ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
/* Generic hooks for arch_dup_mmap and arch_exit_mmap */
#include <asm-generic/mm_hooks.h>
#include <asm-generic/mmu_context.h>
#endif

17
arch/ia64/include/asm/mmu_context.h
View File

@ -49,11 +49,6 @@ DECLARE_PER_CPU(u8, ia64_need_tlb_flush);
extern void mmu_context_init (void);
extern void wrap_mmu_context (struct mm_struct *mm);
static inline void
enter_lazy_tlb (struct mm_struct *mm, struct task_struct *tsk)
{
}
/*
* When the context counter wraps around all TLBs need to be flushed because
* an old context number might have been reused. This is signalled by the
@ -116,6 +111,7 @@ out:
* Initialize context number to some sane value. MM is guaranteed to be a
* brand-new address-space, so no TLB flushing is needed, ever.
*/
#define init_new_context init_new_context
static inline int
init_new_context (struct task_struct *p, struct mm_struct *mm)
{
@ -123,12 +119,6 @@ init_new_context (struct task_struct *p, struct mm_struct *mm)
return 0;
}
static inline void
destroy_context (struct mm_struct *mm)
{
/* Nothing to do. */
}
static inline void
reload_context (nv_mm_context_t context)
{
@ -178,11 +168,10 @@ activate_context (struct mm_struct *mm)
} while (unlikely(context != mm->context));
}
#define deactivate_mm(tsk,mm) do { } while (0)
/*
* Switch from address space PREV to address space NEXT.
*/
#define activate_mm activate_mm
static inline void
activate_mm (struct mm_struct *prev, struct mm_struct *next)
{
@ -196,5 +185,7 @@ activate_mm (struct mm_struct *prev, struct mm_struct *next)
#define switch_mm(prev_mm,next_mm,next_task) activate_mm(prev_mm, next_mm)
#include <asm-generic/mmu_context.h>
# endif /* ! __ASSEMBLY__ */
#endif /* _ASM_IA64_MMU_CONTEXT_H */

38
arch/m68k/include/asm/mmu_context.h
View File

@ -5,10 +5,6 @@
#include <asm-generic/mm_hooks.h>
#include <linux/mm_types.h>
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
#ifdef CONFIG_MMU
#if defined(CONFIG_COLDFIRE)
@ -58,6 +54,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
/*
* We're finished using the context for an address space.
*/
#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
if (mm->context != NO_CONTEXT) {
@ -83,6 +80,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *active_mm,
struct mm_struct *mm)
{
@ -90,8 +88,6 @@ static inline void activate_mm(struct mm_struct *active_mm,
set_context(mm->context, mm->pgd);
}
#define deactivate_mm(tsk, mm) do { } while (0)
#define prepare_arch_switch(next) load_ksp_mmu(next)
static inline void load_ksp_mmu(struct task_struct *task)
@ -176,6 +172,7 @@ extern unsigned long get_free_context(struct mm_struct *mm);
extern void clear_context(unsigned long context);
/* set the context for a new task to unmapped */
#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@ -192,6 +189,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
}
/* flush context if allocated... */
#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
if (mm->context != SUN3_INVALID_CONTEXT)
@ -210,8 +208,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
activate_context(tsk->mm);
}
#define deactivate_mm(tsk, mm) do { } while (0)
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
@ -224,6 +221,7 @@ static inline void activate_mm(struct mm_struct *prev_mm,
#include <asm/page.h>
#include <asm/cacheflush.h>
#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@ -231,8 +229,6 @@ static inline int init_new_context(struct task_struct *tsk,
return 0;
}
#define destroy_context(mm) do { } while(0)
static inline void switch_mm_0230(struct mm_struct *mm)
{
unsigned long crp[2] = {
@ -300,8 +296,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, str
}
}
#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
@ -315,24 +310,11 @@ static inline void activate_mm(struct mm_struct *prev_mm,
#endif
#include <asm-generic/mmu_context.h>
#else /* !CONFIG_MMU */
static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
return 0;
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
{
}
#define destroy_context(mm) do { } while (0)
#define deactivate_mm(tsk,mm) do { } while (0)
static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
{
}
#include <asm-generic/nommu_context.h>
#endif /* CONFIG_MMU */
#endif /* __M68K_MMU_CONTEXT_H */

2
arch/microblaze/include/asm/mmu_context.h
View File

@ -2,5 +2,5 @@
#ifdef CONFIG_MMU
# include <asm/mmu_context_mm.h>
#else
# include <asm-generic/mmu_context.h>
# include <asm-generic/nommu_context.h>
#endif

8
arch/microblaze/include/asm/mmu_context_mm.h
View File

@ -33,10 +33,6 @@
to represent all kernel pages as shared among all contexts.
*/
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
# define NO_CONTEXT 256
# define LAST_CONTEXT 255
# define FIRST_CONTEXT 1
@ -105,6 +101,7 @@ static inline void get_mmu_context(struct mm_struct *mm)
/*
* We're finished using the context for an address space.
*/
#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
if (mm->context != NO_CONTEXT) {
@ -126,6 +123,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *active_mm,
struct mm_struct *mm)
{
@ -136,5 +134,7 @@ static inline void activate_mm(struct mm_struct *active_mm,
extern void mmu_context_init(void);
#include <asm-generic/mmu_context.h>
# endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_MMU_CONTEXT_H */

3
arch/microblaze/include/asm/processor.h
View File

@ -122,9 +122,6 @@ unsigned long get_wchan(struct task_struct *p);
# define KSTK_EIP(task) (task_pc(task))
# define KSTK_ESP(task) (task_sp(task))
/* FIXME */
# define deactivate_mm(tsk, mm) do { } while (0)
# define STACK_TOP TASK_SIZE
# define STACK_TOP_MAX STACK_TOP

11
arch/mips/include/asm/mmu_context.h
View File

@ -124,10 +124,6 @@ static inline void set_cpu_context(unsigned int cpu,
#define cpu_asid(cpu, mm) \
(cpu_context((cpu), (mm)) & cpu_asid_mask(&cpu_data[cpu]))
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
extern void get_new_mmu_context(struct mm_struct *mm);
extern void check_mmu_context(struct mm_struct *mm);
extern void check_switch_mmu_context(struct mm_struct *mm);
@ -136,6 +132,7 @@ extern void check_switch_mmu_context(struct mm_struct *mm);
* Initialize the context related info for a new mm_struct
* instance.
*/
#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@ -180,14 +177,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* Destroy context related info for an mm_struct that is about
* to be put to rest.
*/
#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
dsemul_mm_cleanup(mm);
}
#define activate_mm(prev, next) switch_mm(prev, next, current)
#define deactivate_mm(tsk, mm) do { } while (0)
static inline void
drop_mmu_context(struct mm_struct *mm)
{
@ -237,4 +232,6 @@ drop_mmu_context(struct mm_struct *mm)
local_irq_restore(flags);
}
#include <asm-generic/mmu_context.h>
#endif /* _ASM_MMU_CONTEXT_H */

10
arch/nds32/include/asm/mmu_context.h
View File

@ -9,6 +9,7 @@
#include <asm/proc-fns.h>
#include <asm-generic/mm_hooks.h>
#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@ -16,8 +17,6 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}
#define destroy_context(mm) do { } while(0)
#define CID_BITS 9
extern spinlock_t cid_lock;
extern unsigned int cpu_last_cid;
@ -47,10 +46,6 @@ static inline void check_context(struct mm_struct *mm)
__new_context(mm);
}
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
@ -62,7 +57,6 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
}
#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm(prev,next) switch_mm(prev, next, NULL)
#include <asm-generic/mmu_context.h>
#endif

21
arch/nios2/include/asm/mmu_context.h
View File

@ -26,16 +26,13 @@ extern unsigned long get_pid_from_context(mm_context_t *ctx);
*/
extern pgd_t *pgd_current;
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
/*
* Initialize the context related info for a new mm_struct instance.
*
* Set all new contexts to 0, that way the generation will never match
* the currently running generation when this context is switched in.
*/
#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@ -43,26 +40,16 @@ static inline int init_new_context(struct task_struct *tsk,
return 0;
}
/*
* Destroy context related info for an mm_struct that is about
* to be put to rest.
*/
static inline void destroy_context(struct mm_struct *mm)
{
}
void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk);
static inline void deactivate_mm(struct task_struct *tsk,
struct mm_struct *mm)
{
}
/*
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
#define activate_mm activate_mm
void activate_mm(struct mm_struct *prev, struct mm_struct *next);
#include <asm-generic/mmu_context.h>
#endif /* _ASM_NIOS2_MMU_CONTEXT_H */

8
arch/openrisc/include/asm/mmu_context.h
View File

@ -17,13 +17,13 @@
#include <asm-generic/mm_hooks.h>
#define init_new_context init_new_context
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
#define destroy_context destroy_context
extern void destroy_context(struct mm_struct *mm);
extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk);
#define deactivate_mm(tsk, mm) do { } while (0)
#define activate_mm(prev, next) switch_mm((prev), (next), NULL)
/* current active pgd - this is similar to other processors pgd
@ -32,8 +32,6 @@ extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
extern volatile pgd_t *current_pgd[]; /* defined in arch/openrisc/mm/fault.c */
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
#include <asm-generic/mmu_context.h>
#endif

12
arch/parisc/include/asm/mmu_context.h
View File

@ -7,16 +7,13 @@
#include <linux/atomic.h>
#include <asm-generic/mm_hooks.h>
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
/* on PA-RISC, we actually have enough contexts to justify an allocator
* for them. prumpf */
extern unsigned long alloc_sid(void);
extern void free_sid(unsigned long);
#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@ -26,6 +23,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}
#define destroy_context destroy_context
static inline void
destroy_context(struct mm_struct *mm)
{
@ -71,8 +69,7 @@ static inline void switch_mm(struct mm_struct *prev,
}
#define switch_mm_irqs_off switch_mm_irqs_off
#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
/*
@ -90,4 +87,7 @@ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
switch_mm(prev,next,current);
}
#include <asm-generic/mmu_context.h>
#endif

13
arch/powerpc/include/asm/mmu_context.h
View File

@ -14,7 +14,9 @@
/*
* Most if the context management is out of line
*/
#define init_new_context init_new_context
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
#define destroy_context destroy_context
extern void destroy_context(struct mm_struct *mm);
#ifdef CONFIG_SPAPR_TCE_IOMMU
struct mm_iommu_table_group_mem_t;
@ -235,27 +237,26 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
#define switch_mm_irqs_off switch_mm_irqs_off
#define deactivate_mm(tsk,mm) do { } while (0)
/*
* After we have set current->mm to a new value, this activates
* the context for the new mm so we see the new mappings.
*/
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
switch_mm_irqs_off(prev, next, current);
}
/* We don't currently use enter_lazy_tlb() for anything */
#ifdef CONFIG_PPC_BOOK3E_64
#define enter_lazy_tlb enter_lazy_tlb
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
/* 64-bit Book3E keeps track of current PGD in the PACA */
#ifdef CONFIG_PPC_BOOK3E_64
get_paca()->pgd = NULL;
#endif
}
#endif
extern void arch_exit_mmap(struct mm_struct *mm);
@ -298,5 +299,7 @@ static inline int arch_dup_mmap(struct mm_struct *oldmm,
return 0;
}
#include <asm-generic/mmu_context.h>
#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_MMU_CONTEXT_H */

22
arch/riscv/include/asm/mmu_context.h
View File

@ -13,34 +13,16 @@
#include <linux/mm.h>
#include <linux/sched.h>
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *task)
{
}
/* Initialize context-related info for a new mm_struct */
static inline int init_new_context(struct task_struct *task,
struct mm_struct *mm)
{
return 0;
}
static inline void destroy_context(struct mm_struct *mm)
{
}
void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *task);
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev,
struct mm_struct *next)
{
switch_mm(prev, next, NULL);
}
static inline void deactivate_mm(struct task_struct *task,
struct mm_struct *mm)
{
}
#include <asm-generic/mmu_context.h>
#endif /* _ASM_RISCV_MMU_CONTEXT_H */

9
arch/s390/include/asm/mmu_context.h
View File

@ -15,6 +15,7 @@
#include <asm/ctl_reg.h>
#include <asm-generic/mm_hooks.h>
#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@ -69,8 +70,6 @@ static inline int init_new_context(struct task_struct *tsk,
return 0;
}
#define destroy_context(mm) do { } while (0)
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
@ -104,9 +103,7 @@ static inline void finish_arch_post_lock_switch(void)
__ctl_load(S390_lowcore.user_asce, 7, 7);
}
#define enter_lazy_tlb(mm,tsk) do { } while (0)
#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev,
struct mm_struct *next)
{
@ -115,4 +112,6 @@ static inline void activate_mm(struct mm_struct *prev,
__ctl_load(S390_lowcore.user_asce, 7, 7);
}
#include <asm-generic/mmu_context.h>
#endif /* __S390_MMU_CONTEXT_H */

7
arch/sh/include/asm/mmu_context.h
View File

@ -84,6 +84,7 @@ static inline void get_mmu_context(struct mm_struct *mm, unsigned int cpu)
* Initialize the context related info for a new mm_struct
* instance.
*/
#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@ -120,9 +121,7 @@ static inline void switch_mm(struct mm_struct *prev,
activate_context(next, cpu);
}
#define activate_mm(prev, next) switch_mm((prev),(next),NULL)
#define deactivate_mm(tsk,mm) do { } while (0)
#define enter_lazy_tlb(mm,tsk) do { } while (0)
#include <asm-generic/mmu_context.h>
#else
@ -133,7 +132,7 @@ static inline void switch_mm(struct mm_struct *prev,
#define set_TTB(pgd) do { } while (0)
#define get_TTB() (0)
#include <asm-generic/mmu_context.h>
#include <asm-generic/nommu_context.h>
#endif /* CONFIG_MMU */

9
arch/sh/include/asm/mmu_context_32.h
View File

@ -2,15 +2,6 @@
#ifndef __ASM_SH_MMU_CONTEXT_32_H
#define __ASM_SH_MMU_CONTEXT_32_H
/*
* Destroy context related info for an mm_struct that is about
* to be put to rest.
*/
static inline void destroy_context(struct mm_struct *mm)
{
/* Do nothing */
}
#ifdef CONFIG_CPU_HAS_PTEAEX
static inline void set_asid(unsigned long asid)
{

10
arch/sparc/include/asm/mmu_context_32.h
View File

@ -6,13 +6,10 @@
#include <asm-generic/mm_hooks.h>
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
/* Initialize a new mmu context. This is invoked when a new
* address space instance (unique or shared) is instantiated.
*/
#define init_new_context init_new_context
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
/* Destroy a dead context. This occurs when mmput drops the
@ -20,17 +17,18 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
* all the page tables have been flushed. Our job is to destroy
* any remaining processor-specific state.
*/
#define destroy_context destroy_context
void destroy_context(struct mm_struct *mm);
/* Switch the current MM context. */
void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm,
struct task_struct *tsk);
#define deactivate_mm(tsk,mm) do { } while (0)
/* Activate a new MM instance for the current task. */
#define activate_mm(active_mm, mm) switch_mm((active_mm), (mm), NULL)
#include <asm-generic/mmu_context.h>
#endif /* !(__ASSEMBLY__) */
#endif /* !(__SPARC_MMU_CONTEXT_H) */

10
arch/sparc/include/asm/mmu_context_64.h
View File

@ -16,17 +16,16 @@
#include <asm-generic/mm_hooks.h>
#include <asm/percpu.h>
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
extern spinlock_t ctx_alloc_lock;
extern unsigned long tlb_context_cache;
extern unsigned long mmu_context_bmap[];
DECLARE_PER_CPU(struct mm_struct *, per_cpu_secondary_mm);
void get_new_mmu_context(struct mm_struct *mm);
#define init_new_context init_new_context
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
#define destroy_context destroy_context
void destroy_context(struct mm_struct *mm);
void __tsb_context_switch(unsigned long pgd_pa,
@ -136,7 +135,6 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str
spin_unlock_irqrestore(&mm->context.lock, flags);
}
#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm(active_mm, mm) switch_mm(active_mm, mm, NULL)
#define __HAVE_ARCH_START_CONTEXT_SWITCH
@ -187,6 +185,8 @@ static inline void finish_arch_post_lock_switch(void)
}
}
#include <asm-generic/mmu_context.h>
#endif /* !(__ASSEMBLY__) */
#endif /* !(__SPARC64_MMU_CONTEXT_H) */

12
arch/um/include/asm/mmu_context.h
View File

@ -37,10 +37,9 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
* end asm-generic/mm_hooks.h functions
*/
#define deactivate_mm(tsk,mm) do { } while (0)
extern void force_flush_all(void);
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
{
/*
@ -66,13 +65,12 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
}
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
#define init_new_context init_new_context
extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
#define destroy_context destroy_context
extern void destroy_context(struct mm_struct *mm);
#include <asm-generic/mmu_context.h>
#endif

6
arch/x86/include/asm/mmu_context.h
View File

@ -91,12 +91,14 @@ static inline void switch_ldt(struct mm_struct *prev, struct mm_struct *next)
}
#endif
#define enter_lazy_tlb enter_lazy_tlb
extern void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk);
/*
* Init a new mm. Used on mm copies, like at fork()
* and on mm's that are brand-new, like at execve().
*/
#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@ -116,6 +118,8 @@ static inline int init_new_context(struct task_struct *tsk,
init_new_context_ldt(mm);
return 0;
}
#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
destroy_context_ldt(mm);
@ -214,4 +218,6 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
unsigned long __get_current_cr3_fast(void);
#include <asm-generic/mmu_context.h>
#endif /* _ASM_X86_MMU_CONTEXT_H */

11
arch/xtensa/include/asm/mmu_context.h
View File

@ -111,6 +111,7 @@ static inline void activate_context(struct mm_struct *mm, unsigned int cpu)
* to -1 says the process has never run on any core.
*/
#define init_new_context init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
@ -136,24 +137,18 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
activate_context(next, cpu);
}
#define activate_mm(prev, next) switch_mm((prev), (next), NULL)
#define deactivate_mm(tsk, mm) do { } while (0)
/*
* Destroy context related info for an mm_struct that is about
* to be put to rest.
*/
#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
invalidate_page_directory();
}
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
/* Nothing to do. */
}
#include <asm-generic/mmu_context.h>
#endif /* CONFIG_MMU */
#endif /* _XTENSA_MMU_CONTEXT_H */

26
arch/xtensa/include/asm/nommu_context.h
View File

@ -7,28 +7,4 @@ static inline void init_kio(void)
{
}
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
static inline int init_new_context(struct task_struct *tsk,struct mm_struct *mm)
{
return 0;
}
static inline void destroy_context(struct mm_struct *mm)
{
}
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
}
static inline void deactivate_mm(struct task_struct *tsk, struct mm_struct *mm)
{
}
#include <asm-generic/nommu_context.h>

60
include/asm-generic/mmu_context.h
View File

@ -3,44 +3,74 @@
#define __ASM_GENERIC_MMU_CONTEXT_H
/*
* Generic hooks for NOMMU architectures, which do not need to do
* anything special here.
* Generic hooks to implement no-op functionality.
*/
#include <asm-generic/mm_hooks.h>
struct task_struct;
struct mm_struct;
/*
* enter_lazy_tlb - Called when "tsk" is about to enter lazy TLB mode.
*
* @mm: the currently active mm context which is becoming lazy
* @tsk: task which is entering lazy tlb
*
* tsk->mm will be NULL
*/
#ifndef enter_lazy_tlb
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
#endif
/**
* init_new_context - Initialize context of a new mm_struct.
* @tsk: task struct for the mm
* @mm: the new mm struct
* @return: 0 on success, -errno on failure
*/
#ifndef init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
return 0;
}
#endif
/**
* destroy_context - Undo init_new_context when the mm is going away
* @mm: old mm struct
*/
#ifndef destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
}
#endif
static inline void deactivate_mm(struct task_struct *task,
struct mm_struct *mm)
{
}
static inline void switch_mm(struct mm_struct *prev,
struct mm_struct *next,
struct task_struct *tsk)
{
}
/**
* activate_mm - called after exec switches the current task to a new mm, to switch to it
* @prev_mm: previous mm of this task
* @next_mm: new mm
*/
#ifndef activate_mm
static inline void activate_mm(struct mm_struct *prev_mm,
struct mm_struct *next_mm)
{
switch_mm(prev_mm, next_mm, current);
}
#endif
/**
* dectivate_mm - called when an mm is released after exit or exec switches away from it
* @tsk: the task
* @mm: the old mm
*/
#ifndef deactivate_mm
static inline void deactivate_mm(struct task_struct *tsk,
struct mm_struct *mm)
{
}
#endif
#endif /* __ASM_GENERIC_MMU_CONTEXT_H */

19
include/asm-generic/nommu_context.h Normal file
View File

@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_GENERIC_NOMMU_H
#define __ASM_GENERIC_NOMMU_H
/*
* Generic hooks for NOMMU architectures, which do not need to do
* anything special here.
*/
#include <asm-generic/mm_hooks.h>
static inline void switch_mm(struct mm_struct *prev,
struct mm_struct *next,
struct task_struct *tsk)
{
}
#include <asm-generic/mmu_context.h>
#endif /* __ASM_GENERIC_NOMMU_H */