From: Ganesh Goudar ganeshgr@linux.ibm.com
[ Upstream commit e7ca44ed3ba77fc26cf32650bb71584896662474 ]
Since commit 4388c9b3a6ee ("powerpc: Do not send system reset request through the oops path"), pstore dmesg file is not updated when dump is triggered from HMC. This commit modified system reset (sreset) handler to invoke fadump or kdump (if configured), without pushing dmesg to pstore. This leaves pstore to have old dmesg data which won't be much of a help if kdump fails to capture the dump. This patch fixes that by calling kmsg_dump() before heading to fadump ot kdump.
Fixes: 4388c9b3a6ee ("powerpc: Do not send system reset request through the oops path") Reviewed-by: Mahesh Salgaonkar mahesh@linux.vnet.ibm.com Reviewed-by: Nicholas Piggin npiggin@gmail.com Signed-off-by: Ganesh Goudar ganeshgr@linux.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20190904075949.15607-1-ganeshgr@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kernel/traps.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 47df30982de1b..c8ea3a253b815 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -472,6 +472,7 @@ void system_reset_exception(struct pt_regs *regs) if (debugger(regs)) goto out;
+ kmsg_dump(KMSG_DUMP_OOPS); /* * A system reset is a request to dump, so we always send * it through the crashdump code (if fadump or kdump are