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kernel-ark/arch/arm/mm
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Will Deacon 8a4e3a9ead ARM: 7659/1: mm: make mm->context.id an atomic64_t variable 
mm->context.id is updated under asid_lock when a new ASID is allocated
to an mm_struct. However, it is also read without the lock when a task
is being scheduled and checking whether or not the current ASID
generation is up-to-date.

If two threads of the same process are being scheduled in parallel and
the bottom bits of the generation in their mm->context.id match the
current generation (that is, the mm_struct has not been used for ~2^24
rollovers) then the non-atomic, lockless access to mm->context.id may
yield the incorrect ASID.

This patch fixes this issue by making mm->context.id and atomic64_t,
ensuring that the generation is always read consistently. For code that
only requires access to the ASID bits (e.g. TLB flushing by mm), then
the value is accessed directly, which GCC converts to an ldrb.

Cc: <stable@vger.kernel.org> # 3.8
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-03-03 22:54:14 +00:00
..
abort-ev4.S
abort-ev4t.S
abort-ev5t.S
abort-ev5tj.S
abort-ev6.S ARM: 7396/1: errata: only handle ARM erratum #326103 on affected cores 2012-04-23 14:21:52 +01:00
abort-ev7.S
abort-lv4t.S
abort-macro.S
abort-nommu.S
alignment.c ARM: fix scheduling while atomic warning in alignment handling code 2013-02-25 16:10:42 +00:00
cache-aurora-l2.h ARM: 7547/4: cache-l2x0: add support for Aurora L2 cache ctrl 2012-11-06 19:47:35 +00:00
cache-fa.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
cache-feroceon-l2.c ARM: move CP15 definitions to separate header file 2012-03-28 18:30:01 +01:00
cache-l2x0.c ARM: 7616/1: cache-l2x0: aurora: Use writel_relaxed instead of writel 2013-01-07 15:04:17 +00:00
cache-tauros2.c ARM: cache: add dt support for tauros2 cache 2012-08-16 16:16:50 +08:00
cache-v3.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
cache-v4.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
cache-v4wb.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
cache-v4wt.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
cache-v6.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
cache-v7.S arm: Add v7_invalidate_l1 to cache-v7.S 2013-02-11 19:37:24 -08:00
cache-xsc3l2.c ARM: move CP15 definitions to separate header file 2012-03-28 18:30:01 +01:00
context.c ARM: 7659/1: mm: make mm->context.id an atomic64_t variable 2013-03-03 22:54:14 +00:00
copypage-fa.c arm: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:14 +08:00
copypage-feroceon.c arm: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:14 +08:00
copypage-v4mc.c Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
copypage-v4wb.c arm: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:14 +08:00
copypage-v4wt.c arm: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:14 +08:00
copypage-v6.c Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
copypage-xsc3.c arm: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:14 +08:00
copypage-xscale.c Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
dma-mapping.c ARM: DMA-mapping: fix memory leak in IOMMU dma-mapping implementation 2013-02-25 15:30:44 +01:00
extable.c
fault-armv.c mm: replace vma prio_tree with an interval tree 2012-10-09 16:22:39 +09:00
fault.c readahead: fault retry breaks mmap file read random detection 2012-10-09 16:22:47 +09:00
fault.h ARM: LPAE: Add fault handling support 2011-12-08 10:30:40 +00:00
flush.c mm: replace vma prio_tree with an interval tree 2012-10-09 16:22:39 +09:00
fsr-2level.c ARM: LPAE: Move the FSR definitions to separate files 2011-12-08 10:30:37 +00:00
fsr-3level.c ARM: LPAE: Add fault handling support 2011-12-08 10:30:40 +00:00
highmem.c Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
idmap.c ARM: Section based HYP idmap 2013-01-23 13:29:09 -05:00
init.c ARM: Allow arm_memblock_steal() to remove memory from any RAM region 2012-08-13 00:22:28 +01:00
iomap.c arm/PCI: remove arch pci_flags definition 2012-02-23 20:18:56 -07:00
ioremap.c ARM: 7646/1: mm: use static_vm for managing static mapped areas 2013-02-16 17:54:22 +00:00
Kconfig ARM: virt: hide CONFIG_ARM_VIRT_EXT from user 2013-01-10 21:09:33 +00:00
Makefile ARM: 7644/1: vmregion: remove vmregion code entirely 2013-02-16 17:54:21 +00:00
mm.h ARM: 7645/1: ioremap: introduce an infrastructure for static mapped area 2013-02-16 17:54:22 +00:00
mmap.c Merge branch 'akpm' (Andrew's patchbomb) 2012-12-11 18:05:37 -08:00
mmu.c Merge branch 'for-linus-2' of git://git.linaro.org/people/rmk/linux-arm 2013-02-20 14:29:37 -08:00
nommu.c ARM: 7383/1: nommu: populate vectors page from paging_init 2012-04-13 14:05:42 +01:00
pabort-legacy.S
pabort-v6.S
pabort-v7.S
pgd.c ARM: move CP15 definitions to separate header file 2012-03-28 18:30:01 +01:00
proc-arm7tdmi.S ARM: proc-*.S: place cpu_reset functions into .idmap.text section 2011-12-06 14:04:14 +00:00
proc-arm9tdmi.S ARM: proc-*.S: place cpu_reset functions into .idmap.text section 2011-12-06 14:04:14 +00:00
proc-arm720.S ARM: proc-*.S: place cpu_reset functions into .idmap.text section 2011-12-06 14:04:14 +00:00
proc-arm740.S ARM: proc-*.S: place cpu_reset functions into .idmap.text section 2011-12-06 14:04:14 +00:00
proc-arm920.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm922.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm925.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm926.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm940.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm946.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm1020.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm1020e.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm1022.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-arm1026.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-fa526.S Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
proc-feroceon.S ARM: 7542/1: mm: fix cache LoUIS API for xscale and feroceon 2012-09-28 21:09:50 +01:00
proc-macros.S ARM: 7649/1: mm: mm->context.id fix for big-endian 2013-02-16 17:54:26 +00:00
proc-mohawk.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-sa110.S ARM: proc-*.S: place cpu_reset functions into .idmap.text section 2011-12-06 14:04:14 +00:00
proc-sa1100.S ARM: proc-*.S: place cpu_reset functions into .idmap.text section 2011-12-06 14:04:14 +00:00
proc-syms.c
proc-v6.S ARM: 7650/1: mm: replace direct access to mm->context.id with new macro 2013-02-16 17:54:27 +00:00
proc-v7-2level.S ARM: 7650/1: mm: replace direct access to mm->context.id with new macro 2013-02-16 17:54:27 +00:00
proc-v7-3level.S ARM: 7652/1: mm: fix missing use of 'asid' to get asid value from mm->context.id 2013-03-03 22:54:12 +00:00
proc-v7.S ARM: 7614/1: mm: fix wrong branch from Cortex-A9 to PJ4b 2013-01-06 17:54:08 +00:00
proc-xsc3.S ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
proc-xscale.S ARM: 7542/1: mm: fix cache LoUIS API for xscale and feroceon 2012-09-28 21:09:50 +01:00
tlb-fa.S
tlb-v4.S
tlb-v4wb.S
tlb-v4wbi.S
tlb-v6.S
tlb-v7.S ARM: 7489/1: errata: fix workaround for erratum #720789 on UP systems 2012-08-11 09:16:00 +01:00