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
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asm	ARM: 7659/1: mm: make mm->context.id an atomic64_t variable	2013-03-03 22:54:14 +00:00
debug	arm-soc: soc-specific updates	2013-02-21 15:27:22 -08:00
uapi/asm	ARM: KVM: VGIC accept vcpu and dist base addresses from user space	2013-02-11 18:59:01 +00:00