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authorHeiko Carstens <heiko.carstens@de.ibm.com>2016-03-17 14:21:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-17 15:09:34 -0700
commitd7b85cab74edef84a9330c476478ba8cd732b6a9 (patch)
tree5a99a97f671fa04b9a0bdcad5d5791c8402e67a2
parent26a247fd9f8d2df1965b7f22c9be2fb3a48603f3 (diff)
downloadlinux-d7b85cab74edef84a9330c476478ba8cd732b6a9.tar.bz2
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>
-rw-r--r--lib/bug.c11
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();