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| author | Andi Kleen <andi@firstfloor.org> | 2008-10-15 22:01:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-16 11:21:31 -0700 |
| commit | 25ddbb18aae33ad255eb9f35aacebe3af01e1e9c (patch) | |
| tree | 8df1f840a226ed640c2096710b7d0f1f4d1b88aa /kernel/softlockup.c | |
| parent | 889d51a10712b6fd6175196626de2116858394f4 (diff) | |
| download | linux-25ddbb18aae33ad255eb9f35aacebe3af01e1e9c.tar.gz linux-25ddbb18aae33ad255eb9f35aacebe3af01e1e9c.tar.bz2 linux-25ddbb18aae33ad255eb9f35aacebe3af01e1e9c.zip | |
Make the taint flags reliable
It's somewhat unlikely that it happens, but right now a race window
between interrupts or machine checks or oopses could corrupt the tainted
bitmap because it is modified in a non atomic fashion.
Convert the taint variable to an unsigned long and use only atomic bit
operations on it.
Unfortunately this means the intvec sysctl functions cannot be used on it
anymore.
It turned out the taint sysctl handler could actually be simplified a bit
(since it only increases capabilities) so this patch actually removes
code.
[akpm@linux-foundation.org: remove unneeded include]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/softlockup.c')
| -rw-r--r-- | kernel/softlockup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/softlockup.c b/kernel/softlockup.c index cb838ee93a82..3953e4aed733 100644 --- a/kernel/softlockup.c +++ b/kernel/softlockup.c @@ -226,7 +226,7 @@ static void check_hung_uninterruptible_tasks(int this_cpu) * If the system crashed already then all bets are off, * do not report extra hung tasks: */ - if ((tainted & TAINT_DIE) || did_panic) + if (test_taint(TAINT_DIE) || did_panic) return; read_lock(&tasklist_lock); |