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authorJoshua Wise <jwise@google.com>2007-06-23 17:16:45 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-24 08:59:12 -0700
commit4f84e4be53a04a65d97bf0faa0c8f99e29bc0170 (patch)
tree3371de51ff061cde22dc824f83f4a66c7701dc67 /fs/binfmt_misc.c
parentd8aaf12142d066d3982475d58a9094c85a06a5a9 (diff)
x86_64: fix misplaced `continue' in mce.c
Background: When a userspace application wants to know about machine check events, it opens /dev/mcelog and does a read(). Usually, we found that this interface works well, but in some cases, when the system was taking large numbers of machine check exceptions, the read() would hang. The system would output a soft-lockup warning, and the daemon reading from /dev/mcelog would suck up as much of a single CPU as it could spinning in system space. Description: This patch fixes this bug. In particular, there was a "continue" inside a timeout loop that presumably was intended to break out of the outer loop, but instead caused the inner loop to continue. This patch also makes the condition for the break-out a little more evident by changing a !time_before to a time_after_eq. Result: The read() no longer hangs in this test case. Testing: On my system, I could replicate the bug with the following command: # for i in `seq 15000`; do ./inject_sbe.sh; done where inject_sbe.sh contains commands to inject a single-bit error into the next memory write transaction. Patch: This patch is against git f1518a088bde6aea49e7c472ed6ab96178fcba3e. Signed-off-by: Joshua Wise <jwise@google.com> Signed-off-by: Tim Hockin <thockin@google.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/binfmt_misc.c')
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