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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 9e3961a097 ("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>
hifive-unleashed-5.1
Heiko Carstens 2016-03-17 14:21:38 -07:00 committed by Linus Torvalds
parent 26a247fd9f
commit d7b85cab74
1 changed files with 11 additions and 0 deletions
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11
lib/bug.c
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@ -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();