mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-19 08:05:27 +08:00
004429956b
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>
31 lines
588 B
C
31 lines
588 B
C
/*
|
|
* lib/bust_spinlocks.c
|
|
*
|
|
* Provides a minimal bust_spinlocks for architectures which don't have one of their own.
|
|
*
|
|
* bust_spinlocks() clears any spinlocks which would prevent oops, die(), BUG()
|
|
* and panic() information from reaching the user.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/vt_kern.h>
|
|
|
|
|
|
void __attribute__((weak)) bust_spinlocks(int yes)
|
|
{
|
|
if (yes) {
|
|
++oops_in_progress;
|
|
} else {
|
|
#ifdef CONFIG_VT
|
|
unblank_screen();
|
|
#endif
|
|
if (--oops_in_progress == 0)
|
|
wake_up_klogd();
|
|
}
|
|
}
|
|
|
|
|