Commit b96bae3ae2cb ("powerpc/32: Replace ASM exception exit by C
exception exit from ppc64") erroneouly copied to powerpc/32 the logic
from powerpc/64 based on feature CPU_FTR_STCX_CHECKS_ADDRESS which is
always 0 on powerpc/32.
Re-instate the logic implemented by commit b64f87c16f3c ("[POWERPC]
Avoid unpaired stwcx. on some processors") which is based on
CPU_FTR_NEED_PAIRED_STWCX feature.
Fixes: b96bae3ae2cb ("powerpc/32: Replace ASM exception exit by C exception
exit from ppc64")
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
v2: Fixed the commit message (Wrong patch reference in the beginning)
---
arch/powerpc/kernel/entry_32.S | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 61ffd2989e7b..16f8ee6cb2cd 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -275,10 +275,9 @@ interrupt_return:
mtspr SPRN_SRR1,r12
BEGIN_FTR_SECTION
+ lwarx r0,0,r1
+END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
stwcx. r0,0,r1 /* to clear the reservation */
-FTR_SECTION_ELSE
- lwarx r0,0,r1
-ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
lwz r3,_CCR(r1)
lwz r4,_LINK(r1)
@@ -319,10 +318,9 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
mtspr SPRN_SRR1,r12
BEGIN_FTR_SECTION
+ lwarx r0,0,r1
+END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
stwcx. r0,0,r1 /* to clear the reservation */
-FTR_SECTION_ELSE
- lwarx r0,0,r1
-ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
lwz r3,_LINK(r1)
lwz r4,_CTR(r1)
--
2.49.0
