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authorCatalin Marinas <catalin.marinas@arm.com>2009-09-18 23:27:05 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2009-09-18 23:30:11 +0100
commit200b812d0084f800bc52465e273b118ff5f8141f (patch)
tree6dbef78960ad7b83a76df064751275913583068c /virt/kvm
parentdf58bee21ed218cb7dfb561a590b1bd2a99531cf (diff)
downloadblackbird-op-linux-200b812d0084f800bc52465e273b118ff5f8141f.tar.gz
blackbird-op-linux-200b812d0084f800bc52465e273b118ff5f8141f.zip
Clear the exclusive monitor when returning from an exception
The patch adds a CLREX or dummy STREX to the exception return path. This is needed because several atomic/locking operations use a pair of LDREX/STREXEQ and the EQ condition may not always be satisfied. This would leave the exclusive monitor status set and may cause problems with atomic/locking operations in the interrupted code. With this patch, the atomic_set() operation can be a simple STR instruction (on SMP systems, the global exclusive monitor is cleared by STR anyway). Clearing the exclusive monitor during context switch is no longer needed as this is handled by the exception return path anyway. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Jamie Lokier <jamie@shareable.org>
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