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powerpc: Fix workaround for spurious MCE on POWER9

PATCH Applied Michael Neuling 2 participants 2 messages Sep 29, 2017 PowerPC

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Michael Neuling

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PATCH 1/1 powerpc: Fix workaround for spurious MCE on POWER9

In the recent commit:
d8bd9f3f09 powerpc: Handle MCE on POWER9 with only DSISR bit 30 set
I screwed up the bit. It should be bit 25 (IBM bit 38).

Signed-off-by Michael Neuling <[email protected]>
---
 arch/powerpc/kernel/mce_power.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
arch/powerpc/kernel/mce_power.c +2 -2
index f523125b9d..72f153c6f3 100644
@@ -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);
Signature · 1 line
2.11.0