Commit Graph

150 Commits

Author SHA1 Message Date
Noam Camus
7e5122190b ARC: [SMP] Fix IPI IRQ registration
Handle it just like timer. Current request_percpu_irq() would fail on
non-boot cpus and thus IRQ will remian unmasked on those cpus.

[vgupta: fix changelong]
Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26 11:58:25 +05:30
Anton Kolesov
a4b6cb735b ARC: Implement ptrace(PTRACE_GET_THREAD_AREA)
This patch adds implementation of GET_THREAD_AREA ptrace request type. This
is required by GDB to debug NPTL applications.

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26 10:14:08 +05:30
Vineet Gupta
bef444a330 ARC: optimize kernel bss clearing in early boot code
using ARC ZOL which reduces tot num of instructions by half

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26 10:14:05 +05:30
Vineet Gupta
ba25915fb2 ARC: Fix build breakage for !CONFIG_ARC_DW2_UNWIND
Fixes: ec7ac6afd0 (ARC: switch to generic ENTRY/END assembler annotations)
Reported-by: Anton Kolesov <akolesov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26 10:14:02 +05:30
Vineet Gupta
760ecbc7d0 ARC: fix build warning in devtree
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-23 11:50:26 +05:30
Linus Torvalds
9b651cc227 Nothing too exciting here, just minor fixes/cleanup. Only noteworthy ones are:
* Moving cache disabling to early boot
 * ARC UART enabled only if earlyprintk setup in cmdline
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Merge tag 'arc-v3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC updates from Vineet Gupta:
 "Nothing too exciting here, just minor fixes/cleanup.  Only noteworthy
  ones are:

   - Moving cache disabling to early boot
   - ARC UART enabled only if earlyprintk setup in cmdline"

* tag 'arc-v3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: Disable caches in early boot if so configured
  ARC: [arcfpga] Early ARC UART to be only activated by cmdline
  ARC: [arcfpga] Get rid of legacy BVCI latency unit support
  ARC: remove duplicate header exports
  ARC: arc_local_timer_setup() need not pass own cpu id
  ARC: Fixed spelling errors within comments
  ARC: make start_thread() out-of-line
  ARC: fix mmuv2 warning
  ARC: [SMP] ISS SMP extension bitrot
2014-06-09 18:05:11 -07:00
Davidlohr Bueso
5040573e49 arc: call find_vma with the mmap_sem held
Performing vma lookups without taking the mm->mmap_sem is asking for
trouble.  While doing the search, the vma in question can be modified or
even removed before returning to the caller.  Take the lock (shared) in
order to avoid races while iterating through the vmacache and/or rbtree.

[akpm@linux-foundation.org: CSE current->active_mm, per Vineet]
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-04 16:54:00 -07:00
Vineet Gupta
ef680cdc24 ARC: Disable caches in early boot if so configured
Requested-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-03 15:14:48 +05:30
Vineet Gupta
2d4899f6bd ARC: arc_local_timer_setup() need not pass own cpu id
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-03 13:26:52 +05:30
Rob Herring
eafd370dfe Merge branch 'dt-bus-name' into for-next 2014-05-13 18:34:35 -05:00
Terence Eden
f63f98ea25 ARC: Fixed spelling errors within comments
[vgupta: fixed changelong + added Randy's suggestion]
Signed-off-by: Terence Eden <github.com@shkspr.mobi>
Acked-by: Randy Dunlap <rdunlap@infradead.org>

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-05-05 14:22:12 +05:30
Vineet Gupta
2ab402dfd6 ARC: make start_thread() out-of-line
Helps move out ISA specific bits from a arch exported header

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-05-05 14:22:12 +05:30
Vineet Gupta
9a091d9e84 ARC: [SMP] ISS SMP extension bitrot
* Move extension specific code out of common SMP code
* Don't enable it by default for SMP

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-05-05 14:22:12 +05:30
Vineet Gupta
8aa9e85ada ARC: !PREEMPT: Ensure Return to kernel mode is IRQ safe
There was a very small race window where resume to kernel mode from a
Exception Path (or pure kernel mode which is true for most of ARC
exceptions anyways), was not disabling interrupts in restore_regs,
clobbering the exception regs

Anton found the culprit call flow (after many sleepless nights)

| 1. we got a Trap from user land
| 2. started to service it.
| 3. While doing some stuff on user-land memory (I think it is padzero()),
|     we got a DataTlbMiss
| 4. On return from it we are taking "resume_kernel_mode" path
| 5. NEED_RESHED is not set, so we go to "return from exception" path in
|     restore regs.
| 6. there seems to be IRQ happening

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: <stable@vger.kernel.org>   #3.10, 3.12, 3.13, 3.14
Cc: Anton Kolesov <Anton.Kolesov@synopsys.com>
Cc: Francois Bedard <Francois.Bedard@synopsys.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-30 08:21:43 -07:00
Rob Herring
9d0c4dfedd of/fdt: update of_get_flat_dt_prop in prep for libfdt
Make of_get_flat_dt_prop arguments compatible with libfdt fdt_getprop
call in preparation to convert FDT code to use libfdt. Make the return
value const and the property length ptr type an int.

Signed-off-by: Rob Herring <robh@kernel.org>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Tested-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-30 00:59:15 -05:00
Vineet Gupta
c3441edd2d ARC: [SMP] General Fixes
-Pass the expected arg to non-boot park'ing routine
 (It worked so far because existing SMP backends don't use the arg)

-CONFIG_DEBUG_PREEMPT warning
2014-04-05 14:46:42 +05:30
Vineet Gupta
f8b34c3fd5 ARC: [clockevent] simplify timer ISR
* Remove one liner IRQ ACK accessor, it was coming in the way of readability.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-03-26 14:31:30 +05:30
Vineet Gupta
35571f4bdc ARC: [clockevent] can't be SoC specific
So no point keeping it weak

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-03-26 14:31:29 +05:30
Vineet Gupta
ec7ac6afd0 ARC: switch to generic ENTRY/END assembler annotations
With commit 9df62f0544 "arch: use ASM_NL instead of ';'" the generic
macros can handle the arch specific newline quirk. Hence we can get rid
of ARC asm macros and use the "C" style macros.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-03-26 14:31:28 +05:30
Vineet Gupta
e57d339a62 ARC: [cmdline] support External Device Trees from u-boot
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-01-16 18:53:16 +05:30
Vineet Gupta
59ed941353 ARC: [cmdline] uboot cmdline handling rework
* Moved cmdline copy from asm to "C" - allows for more robust checking
  of pointer validity etc.

* Remove the Kconfig option to do so, base it on a runtime value passed
  by u-boot

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-01-16 18:49:38 +05:30
Vineet Gupta
d8e8c7dda1 ARC: [SMP] optimize IPI send and receive
* Don't send an IPI if receiver already has a pending IPI.
  Atomically piggyback the new msg with pending msg.

* IPI receiver looping on xchg() not required

References: https://lkml.org/lkml/2013/11/25/232
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23 12:05:04 +05:30
Vineet Gupta
f2a4aa5646 ARC: [SMP] simplify IPI code
* ipi_data is just a word, no need to keep it as struct

* find_next_bit() not needed to loop thru a 32bit word, ffs suffices
2013-12-23 12:05:04 +05:30
Vineet Gupta
53dc110c97 ARC: [SMP] cpu halt interface doesn't need "self" cpu-id
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23 12:05:04 +05:30
Vineet Gupta
ccdaa6e0c8 ARC: [SMP] IPI ACK interface doesn't need "self" cpu-id
The interface is confusing, it feels like we are getting "sender" info,
whereas it is the "receiver", which can very well be retrived by
smp_processor_id(), if need be.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23 12:05:04 +05:30
Vineet Gupta
ddf84433f4 ARC: [SMP] cpumask not needed in IPI send path
The current IPI sending callstack needlessly involves cpumask.

   arch_send_call_function_single_ipi(cpu) / smp_send_reschedule(cpu)
      ipi_send_msg(cpumask_of(cpu))	--> [cpu to cpumask]
         plat_smp_ops.ipi_send(callmap)
            for_each_cpu(callmap)	--> [cpuask to cpu]
               do_plat_specific_ipi_PER_CPU

Given that current backends are not capable of 1:N IPIs, lets simplify
the interface for now, by keeping "a" cpu all along.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23 12:05:04 +05:30
Vineet Gupta
da990a4f2d ARC: [perf] Fix a few thinkos
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-28 15:49:59 +05:30
Linus Torvalds
dec8e46178 Final set of ARC changes for 3.13-rc1
* Support for Perf from Mischa
 * Enabling GPIO/Pinctrl drivers for Abilis TB10x platform
 * New defconfig for buildroot
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Merge tag 'arc-v3.13-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull second set of ARC changes from Vineet Gupta:
 - Support for Perf from Mischa
 - Enabling GPIO/Pinctrl drivers for Abilis TB10x platform
 - New defconfig for buildroot

* tag 'arc-v3.13-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: [plat-arcfpga] Add defconfig without initramfs location
  ARC: perf: ARC 700 PMU doesn't support sampling events
  ARC: Add documentation on DT binding for ARC700 PMU
  ARC: Add perf support for ARC700 cores
  ARC: [TB10x] Updates for GPIO and pinctrl
2013-11-19 11:44:15 -08:00
Linus Torvalds
9073e1a804 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
Pull trivial tree updates from Jiri Kosina:
 "Usual earth-shaking, news-breaking, rocket science pile from
  trivial.git"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (23 commits)
  doc: usb: Fix typo in Documentation/usb/gadget_configs.txt
  doc: add missing files to timers/00-INDEX
  timekeeping: Fix some trivial typos in comments
  mm: Fix some trivial typos in comments
  irq: Fix some trivial typos in comments
  NUMA: fix typos in Kconfig help text
  mm: update 00-INDEX
  doc: Documentation/DMA-attributes.txt fix typo
  DRM: comment: `halve' -> `half'
  Docs: Kconfig: `devlopers' -> `developers'
  doc: typo on word accounting in kprobes.c in mutliple architectures
  treewide: fix "usefull" typo
  treewide: fix "distingush" typo
  mm/Kconfig: Grammar s/an/a/
  kexec: Typo s/the/then/
  Documentation/kvm: Update cpuid documentation for steal time and pv eoi
  treewide: Fix common typo in "identify"
  __page_to_pfn: Fix typo in comment
  Correct some typos for word frequency
  clk: fixed-factor: Fix a trivial typo
  ...
2013-11-15 16:47:22 -08:00
Mischa Jonker
230c4aadcc ARC: perf: ARC 700 PMU doesn't support sampling events
The ARC 700 does not have an interrupt associated with it, and as
such it cannot trigger when a counter overflows. As the counters are
48 bit, it will usually take at least 100 days before a counter
overflows, so for mere counting of events, there is no problem.
Sampling is not supported though.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-15 10:52:28 +05:30
Linus Torvalds
10d0c9705e DeviceTree updates for 3.13. This is a bit larger pull request than
usual for this cycle with lots of clean-up.
 
 - Cross arch clean-up and consolidation of early DT scanning code.
 - Clean-up and removal of arch prom.h headers. Makes arch specific
   prom.h optional on all but Sparc.
 - Addition of interrupts-extended property for devices connected to
   multiple interrupt controllers.
 - Refactoring of DT interrupt parsing code in preparation for deferred
   probe of interrupts.
 - ARM cpu and cpu topology bindings documentation.
 - Various DT vendor binding documentation updates.
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Merge tag 'devicetree-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull devicetree updates from Rob Herring:
 "DeviceTree updates for 3.13.  This is a bit larger pull request than
  usual for this cycle with lots of clean-up.

   - Cross arch clean-up and consolidation of early DT scanning code.
   - Clean-up and removal of arch prom.h headers.  Makes arch specific
     prom.h optional on all but Sparc.
   - Addition of interrupts-extended property for devices connected to
     multiple interrupt controllers.
   - Refactoring of DT interrupt parsing code in preparation for
     deferred probe of interrupts.
   - ARM cpu and cpu topology bindings documentation.
   - Various DT vendor binding documentation updates"

* tag 'devicetree-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (82 commits)
  powerpc: add missing explicit OF includes for ppc
  dt/irq: add empty of_irq_count for !OF_IRQ
  dt: disable self-tests for !OF_IRQ
  of: irq: Fix interrupt-map entry matching
  MIPS: Netlogic: replace early_init_devtree() call
  of: Add Panasonic Corporation vendor prefix
  of: Add Chunghwa Picture Tubes Ltd. vendor prefix
  of: Add AU Optronics Corporation vendor prefix
  of/irq: Fix potential buffer overflow
  of/irq: Fix bug in interrupt parsing refactor.
  of: set dma_mask to point to coherent_dma_mask
  of: add vendor prefix for PHYTEC Messtechnik GmbH
  DT: sort vendor-prefixes.txt
  of: Add vendor prefix for Cadence
  of: Add empty for_each_available_child_of_node() macro definition
  arm/versatile: Fix versatile irq specifications.
  of/irq: create interrupts-extended property
  microblaze/pci: Drop PowerPC-ism from irq parsing
  of/irq: Create of_irq_parse_and_map_pci() to consolidate arch code.
  of/irq: Use irq_of_parse_and_map()
  ...
2013-11-12 16:52:17 +09:00
Mischa Jonker
0dd450fe13 ARC: Add perf support for ARC700 cores
This adds basic perf support for ARC700 cores. Most PERF_COUNT_HW* events
are supported now.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-12 09:45:38 +05:30
Rob Herring
b5480950c6 Merge remote-tracking branch 'grant/devicetree/next' into for-next 2013-11-07 10:34:46 -06:00
Jiang Liu
06b93c347c smp, ARC: kill SMP single function call interrupt
Commit 9a46ad6d6d "smp: make smp_call_function_many() use logic
similar to smp_call_function_single()" has unified the way to handle
single and multiple cross-CPU function calls. Now only one interrupt
is needed for architecture specific code to support generic SMP function
call interfaces, so kill the redundant single function call interrupt.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-07 14:34:31 +05:30
Vineet Gupta
7d0857a54a ARC: [SMP] Disallow RTSC
RTSC is strictly incore and must not be allowed in SMP configs

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-07 14:34:31 +05:30
Vineet Gupta
57e26e5745 ARC: [SMP] Fix build failures for large NR_CPUS
ST.as only takes S9 (255) for offset. This was going out of range when
accessing a task_struct field with 4k NR_CPUS (due to 128b of coumaks
itself in there).

Workaround by using an intermediate register to do the address scaling.

There is some duplication of fix for ctx_sw.c and ctx_sw_asm.S however
given that C version will go away soon I'm not bothering to factor out
the common code.

Reported-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:46 +05:30
Vineet Gupta
5ea72a9026 ARC: [SMP] TLB flush
- Add mm_cpumask setting (aggregating only, unlike some other arches)
  used to restrict the TLB flush cross-calling

- cross-calling versions of TLB flush routines (thanks to Noam)

Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:45 +05:30
Chen Gang
b6fe8e7c01 arc: export symbol for pm_power_off in reset.c
Need export symbol for it, or can not pass compiling, the related error
with allmodconfig:

    MODPOST 2994 modules
  ERROR: "pm_power_off" [drivers/mfd/retu-mfd.ko] undefined!
  ERROR: "pm_power_off" [drivers/char/ipmi/ipmi_poweroff.ko] undefined!

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:44 +05:30
Chen Gang
8f146d0204 arc: export symbol for save_stack_trace() in stacktrace.c
Need export its symbol just like other architectures done, or can not
pass compiling with allmodconfig, the related error:

    MODPOST 2994 modules
  ERROR: "save_stack_trace" [kernel/backtracetest.ko] undefined!
  ERROR: "save_stack_trace" [drivers/md/persistent-data/dm-persistent-data.ko] undefined!

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:44 +05:30
Chen Gang
4782f7f9ae arc: remove '__init' for get_hw_config_num_irq()
get_hw_config_num_irq() may be called by normal iss_model_init_smp()
which is a function pointer for 'init_smp' which may be called by
first_lines_of_secondary() which also need be normal too.

The related warning (with allmodconfig):

    MODPOST vmlinux.o
  WARNING: vmlinux.o(.text+0x5814): Section mismatch in reference from the function iss_model_init_smp() to the function .init.text:get_hw_config_num_irq()
  The function iss_model_init_smp() references
  the function __init get_hw_config_num_irq().
  This is often because iss_model_init_smp lacks a __init
  annotation or the annotation of get_hw_config_num_irq is wrong.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
2013-11-06 10:41:43 +05:30
Chen Gang
8f5d221b06 arc: remove '__init' for first_lines_of_secondary()
first_lines_of_secondary() is a '__init' function, but it may be called
by __cpu_up() by _cpu_up() by cpu_up() which is a normal export symbol
function. So recommend to remove '__init'.

The related warning (with allmodconfig):

    MODPOST vmlinux.o
  WARNING: vmlinux.o(.text+0x315c): Section mismatch in reference from the function __cpu_up() to the function .init.text:first_lines_of_secondary()
  The function __cpu_up() references
  the function __init first_lines_of_secondary().
  This is often because __cpu_up lacks a __init
  annotation or the annotation of first_lines_of_secondary is wrong.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
2013-11-06 10:41:43 +05:30
Chen Gang
3d01c1ce41 arc: kgdb: add default implementation for kgdb_roundup_cpus()
arc supports kgdb, but need update -- add function kgdb_roundup_cpus(),
or can not pass compiling. At present, add the simple generic one just
like other architectures(e.g. tile, mips ...).

The related error (with allmodconfig):

  kernel/built-in.o: In function `kgdb_cpu_enter':
  kernel/debug/debug_core.c:580: undefined reference to `kgdb_roundup_cpus'

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:41 +05:30
Vineet Gupta
0dafafc3ef ARC: Add support for irqflags tracing and lockdep
Lockdep required a small fix to stacktrace API which was incorrectly
unwindign out of __switch_to for the current call frame.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:40 +05:30
Vineet Gupta
54c8bff14d ARC: Reset the value of Interrupt Priority Register
In case bootloader has changed the priority of one/more IRQ lines

Reported-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:40 +05:30
Vineet Gupta
07ba69a46c ARC: Reduce #ifdef'ery for unaligned access emulation
Emulation not enabled is treated as if the fixup failed, so no need for
special #ifdef checks.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:39 +05:30
Vineet Gupta
21a63b5604 ARC: Change calling convention of do_page_fault()
switch the args (address, pt_regs) to match with all the other "C"
exception handlers.

This removes the awkwardness in EV_ProtV for page fault vs. unaligned
access.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:41:39 +05:30
Vineet Gupta
064a626924 ARC: use __weak instead of __attribute__((weak))
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:40:37 +05:30
Vineet Gupta
8e457d6a75 ARC: Annotate some functions as static
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06 10:40:37 +05:30
Christoph Lameter
6855e95ce3 arc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of them is
address calculation via the form &__get_cpu_var(x). This calculates the address for
the instance of the percpu variable of the current processor based on an offset.

Other use cases are for storing and retrieving data from the current processors percpu area.
__get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment.

__get_cpu_var() is defined as :

#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))

__get_cpu_var() always only does an address determination. However, store and retrieve operations
could use a segment prefix (or global register on other platforms) to avoid the address calculation.

this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use
optimized assembly code to read and write per cpu variables.

This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr()
or into a use of this_cpu operations that use the offset. Thereby address calcualtions are avoided
and less registers are used when code is generated.

At the end of the patchset all uses of __get_cpu_var have been removed so the macro is removed too.

The patchset includes passes over all arches as well. Once these operations are used throughout then
specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by
f.e. using a global register that may be set to the per cpu base.

Transformations done to __get_cpu_var()

1. Determine the address of the percpu instance of the current processor.

	DEFINE_PER_CPU(int, y);
	int *x = &__get_cpu_var(y);

    Converts to

	int *x = this_cpu_ptr(&y);

2. Same as #1 but this time an array structure is involved.

	DEFINE_PER_CPU(int, y[20]);
	int *x = __get_cpu_var(y);

    Converts to

	int *x = this_cpu_ptr(y);

3. Retrieve the content of the current processors instance of a per cpu variable.

	DEFINE_PER_CPU(int, u);
	int x = __get_cpu_var(y)

   Converts to

	int x = __this_cpu_read(y);

4. Retrieve the content of a percpu struct

	DEFINE_PER_CPU(struct mystruct, y);
	struct mystruct x = __get_cpu_var(y);

   Converts to

	memcpy(this_cpu_ptr(&x), y, sizeof(x));

5. Assignment to a per cpu variable

	DEFINE_PER_CPU(int, y)
	__get_cpu_var(y) = x;

   Converts to

	this_cpu_write(y, x);

6. Increment/Decrement etc of a per cpu variable

	DEFINE_PER_CPU(int, y);
	__get_cpu_var(y)++

   Converts to

	this_cpu_inc(y)

Acked-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
2013-11-06 10:40:37 +05:30
Anoop Thomas Mathew
23d6d3db66 doc: typo on word accounting in kprobes.c in mutliple architectures
Signed-off-by: Anoop Thomas Mathew <atm@profoundis.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2013-10-14 15:46:39 +02:00