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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2016-03-17 14:21:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-17 15:09:34 -0700 |
| commit | d7b85cab74edef84a9330c476478ba8cd732b6a9 (patch) | |
| tree | 5a99a97f671fa04b9a0bdcad5d5791c8402e67a2 /lib/bug.c | |
| parent | 26a247fd9f8d2df1965b7f22c9be2fb3a48603f3 (diff) | |
| download | linux-d7b85cab74edef84a9330c476478ba8cd732b6a9.tar.gz linux-d7b85cab74edef84a9330c476478ba8cd732b6a9.tar.xz | |
lib/bug.c: make panic_on_warn available for all architectures
Christian Borntraeger reported that panic_on_warn doesn't have any
effect on s390.
The panic_on_warn feature was introduced with 9e3961a09798 ("kernel: add
panic_on_warn"). However it did care only for the case when
WANT_WARN_ON_SLOWPATH is defined. This is turn is only the case for
architectures which do not have an own __WARN_TAINT defined.
Other architectures which do have __WARN_TAINT defined call report_bug()
for warnings within lib/bug.c which does not call panic() in case
panic_on_warn is set.
Let's simply enable the panic_on_warn feature by adding the same code
like it was added to warn_slowpath_common() in panic.c.
This enables panic_on_warn also for arm64, parisc, powerpc, s390 and sh.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Prarit Bhargava <prarit@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Tested-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/bug.c')
| -rw-r--r-- | lib/bug.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/bug.c b/lib/bug.c index cff145f032a5..6cde380f09de 100644 --- a/lib/bug.c +++ b/lib/bug.c @@ -175,6 +175,17 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs) pr_warn("WARNING: at %p [verbose debug info unavailable]\n", (void *)bugaddr); + if (panic_on_warn) { + /* + * This thread may hit another WARN() in the panic path. + * Resetting this prevents additional WARN() from + * panicking the system on this thread. Other threads + * are blocked by the panic_mutex in panic(). + */ + panic_on_warn = 0; + panic("panic_on_warn set ...\n"); + } + print_modules(); show_regs(regs); print_oops_end_marker(); |