diff options
| author | Jan Beulich <jbeulich@novell.com> | 2007-10-16 23:29:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:56 -0700 |
| commit | 004429956b4875e6bc2a31833f75363ce48cbea9 (patch) | |
| tree | b137a191e02dd086a7c9aaa41fb88b7bdd362ce4 /lib/bust_spinlocks.c | |
| parent | b311e921b385b5a848f0806df16276aca1ecae07 (diff) | |
| download | lwn-004429956b4875e6bc2a31833f75363ce48cbea9.tar.gz lwn-004429956b4875e6bc2a31833f75363ce48cbea9.zip | |
handle recursive calls to bust_spinlocks()
Various architectures may call bust_spinlocks() recursively; the function
itself, however, doesn't appear to be meant to be called in this manner.
Nevertheless, this doesn't appear to be a problem as long as
bust_spinlocks(0) doesn't get called twice in a row (otherwise,
unblank_screen() may enter the scheduler). However, at least on i386 die()
has been capable of returning (and on other architectures this should
really be that way, too) when notify_die() returns NOTIFY_STOP.
Short of getting a reply to a respective query, this patch makes
bust_spinlocks() increment/decrement oops_in_progress, and wake klogd only
when the count drops back to zero.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/bust_spinlocks.c')
| -rw-r--r-- | lib/bust_spinlocks.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/bust_spinlocks.c b/lib/bust_spinlocks.c index accb35658169..486da62b2b07 100644 --- a/lib/bust_spinlocks.c +++ b/lib/bust_spinlocks.c @@ -17,13 +17,13 @@ void __attribute__((weak)) bust_spinlocks(int yes) { if (yes) { - oops_in_progress = 1; + ++oops_in_progress; } else { #ifdef CONFIG_VT unblank_screen(); #endif - oops_in_progress = 0; - wake_up_klogd(); + if (--oops_in_progress == 0) + wake_up_klogd(); } } |