c6ae41e7d4
Since percpu_xxx() serial functions are duplicated with this_cpu_xxx(). Removing percpu_xxx() definition and replacing them by this_cpu_xxx() in code. There is no function change in this patch, just preparation for later percpu_xxx serial function removing. On x86 machine the this_cpu_xxx() serial functions are same as __this_cpu_xxx() without no unnecessary premmpt enable/disable. Thanks for Stephen Rothwell, he found and fixed a i386 build error in the patch. Also thanks for Andrew Morton, he kept updating the patchset in Linus' tree. Signed-off-by: Alex Shi <alex.shi@intel.com> Acked-by: Christoph Lameter <cl@gentwo.org> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Tejun Heo <tj@kernel.org>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
#ifndef _ASM_X86_MMU_CONTEXT_H
|
|
#define _ASM_X86_MMU_CONTEXT_H
|
|
|
|
#include <asm/desc.h>
|
|
#include <linux/atomic.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/paravirt.h>
|
|
#ifndef CONFIG_PARAVIRT
|
|
#include <asm-generic/mm_hooks.h>
|
|
|
|
static inline void paravirt_activate_mm(struct mm_struct *prev,
|
|
struct mm_struct *next)
|
|
{
|
|
}
|
|
#endif /* !CONFIG_PARAVIRT */
|
|
|
|
/*
|
|
* Used for LDT copy/destruction.
|
|
*/
|
|
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
|
|
void destroy_context(struct mm_struct *mm);
|
|
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
|
|
this_cpu_write(cpu_tlbstate.state, TLBSTATE_LAZY);
|
|
#endif
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
unsigned cpu = smp_processor_id();
|
|
|
|
if (likely(prev != next)) {
|
|
#ifdef CONFIG_SMP
|
|
this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
|
|
this_cpu_write(cpu_tlbstate.active_mm, next);
|
|
#endif
|
|
cpumask_set_cpu(cpu, mm_cpumask(next));
|
|
|
|
/* Re-load page tables */
|
|
load_cr3(next->pgd);
|
|
|
|
/* stop flush ipis for the previous mm */
|
|
cpumask_clear_cpu(cpu, mm_cpumask(prev));
|
|
|
|
/*
|
|
* load the LDT, if the LDT is different:
|
|
*/
|
|
if (unlikely(prev->context.ldt != next->context.ldt))
|
|
load_LDT_nolock(&next->context);
|
|
}
|
|
#ifdef CONFIG_SMP
|
|
else {
|
|
this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
|
|
BUG_ON(this_cpu_read(cpu_tlbstate.active_mm) != next);
|
|
|
|
if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next))) {
|
|
/* We were in lazy tlb mode and leave_mm disabled
|
|
* tlb flush IPI delivery. We must reload CR3
|
|
* to make sure to use no freed page tables.
|
|
*/
|
|
load_cr3(next->pgd);
|
|
load_LDT_nolock(&next->context);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#define activate_mm(prev, next) \
|
|
do { \
|
|
paravirt_activate_mm((prev), (next)); \
|
|
switch_mm((prev), (next), NULL); \
|
|
} while (0);
|
|
|
|
#ifdef CONFIG_X86_32
|
|
#define deactivate_mm(tsk, mm) \
|
|
do { \
|
|
lazy_load_gs(0); \
|
|
} while (0)
|
|
#else
|
|
#define deactivate_mm(tsk, mm) \
|
|
do { \
|
|
load_gs_index(0); \
|
|
loadsegment(fs, 0); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_MMU_CONTEXT_H */
|