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author | Tejun Heo <tj@kernel.org> | 2010-07-22 12:14:25 (GMT) |
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committer | Tejun Heo <tj@kernel.org> | 2010-07-22 20:39:22 (GMT) |
commit | e120153ddf8620fd0a194d301e9c5a8b28483bb5 (patch) | |
tree | 953ef1a61ca29d0486a6c8c3bb72dd8bbc080419 /Makefile | |
parent | f2e005aaff4878a8ea93d5fb033a21389b72579a (diff) | |
download | linux-e120153ddf8620fd0a194d301e9c5a8b28483bb5.tar.xz |
workqueue: fix how cpu number is stored in work->data
Once a work starts execution, its data contains the cpu number it was
on instead of pointing to cwq. This is added by commit 7a22ad75
(workqueue: carry cpu number in work data once execution starts) to
reliably determine the work was last on even if the workqueue itself
was destroyed inbetween.
Whether data points to a cwq or contains a cpu number was
distinguished by comparing the value against PAGE_OFFSET. The
assumption was that a cpu number should be below PAGE_OFFSET while a
pointer to cwq should be above it. However, on architectures which
use separate address spaces for user and kernel spaces, this doesn't
hold as PAGE_OFFSET is zero.
Fix it by using an explicit flag, WORK_STRUCT_CWQ, to mark what the
data field contains. If the flag is set, it's pointing to a cwq;
otherwise, it contains a cpu number.
Reported on s390 and microblaze during linux-next testing.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Sachin Sant <sachinp@in.ibm.com>
Reported-by: Michal Simek <michal.simek@petalogix.com>
Reported-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Tested-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Tested-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions