From: Nicholas Piggin <npiggin@gmail.com>
Date: Wed, 8 Jul 2020 07:49:42 +0000 (+1000)
Subject: powerpc/64s/exception: Fix 0x1500 interrupt handler crash
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4557ac6b344b8cdf948ff8b007e8e1de34832f2e;p=linux.git

powerpc/64s/exception: Fix 0x1500 interrupt handler crash

A typo caused the interrupt handler to branch immediately to the
common "unknown interrupt" handler and skip the special case test for
denormal cause.

This does not affect KVM softpatch handling (e.g., for POWER9 TM
assist) because the KVM test was moved to common code by commit
9600f261acaa ("powerpc/64s/exception: Move KVM test to common code")
just before this bug was introduced.

Fixes: 3f7fbd97d07d ("powerpc/64s/exception: Clean up SRR specifiers")
Reported-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Paul Menzel <pmenzel@molgen.mpg.de>
[mpe: Split selftest into a separate patch]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200708074942.1713396-1-npiggin@gmail.com
---

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index fa080694e581e..0fc8bad878b2d 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -2551,7 +2551,7 @@ EXC_VIRT_NONE(0x5400, 0x100)
 INT_DEFINE_BEGIN(denorm_exception)
 	IVEC=0x1500
 	IHSRR=1
-	IBRANCH_COMMON=0
+	IBRANCH_TO_COMMON=0
 	IKVM_REAL=1
 INT_DEFINE_END(denorm_exception)