From bca73f595a566f0262967535bb5b2ea9c4271d9a Mon Sep 17 00:00:00 2001
From: Michael Neuling <mikey@neuling.org>
Date: Thu, 28 Sep 2017 22:37:35 -0500
Subject: [PATCH] powerpc: Fix workaround for spurious MCE on POWER9
References: bsc#1055117
Patch-mainline: v4.14-rc4
Git-commit: bca73f595a566f0262967535bb5b2ea9c4271d9a
In the recent commit d8bd9f3f0925 ("powerpc: Handle MCE on POWER9 with
only DSISR bit 30 set") I screwed up the bit number. It should be bit
25 (IBM bit 38).
Fixes: d8bd9f3f0925 ("powerpc: Handle MCE on POWER9 with only DSISR bit 30 set")
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/mce_power.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c
index f523125b9d34..72f153c6f3fa 100644
--- a/arch/powerpc/kernel/mce_power.c
+++ b/arch/powerpc/kernel/mce_power.c
@@ -626,7 +626,7 @@ long __machine_check_early_realmode_p9(struct pt_regs *regs)
{
/*
* On POWER9 DD2.1 and below, it's possible to get a machine check
- * caused by a paste instruction where only DSISR bit 30 is set. This
+ * caused by a paste instruction where only DSISR bit 25 is set. This
* will result in the MCE handler seeing an unknown event and the kernel
* crashing. An MCE that occurs like this is spurious, so we don't need
* to do anything in terms of servicing it. If there is something that
@@ -634,7 +634,7 @@ long __machine_check_early_realmode_p9(struct pt_regs *regs)
* correct DSISR so that it can be serviced properly. So detect this
* case and mark it as handled.
*/
- if (SRR1_MC_LOADSTORE(regs->msr) && regs->dsisr == 0x40000000)
+ if (SRR1_MC_LOADSTORE(regs->msr) && regs->dsisr == 0x02000000)
return 1;
return mce_handle_error(regs, mce_p9_derror_table, mce_p9_ierror_table);
--
2.10.2