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-rw-r--r--arch/powerpc/kernel/entry_32.S15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 56212bc0ab08..4f80cf1ce77b 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -215,7 +215,22 @@ reenable_mmu: /* re-enable mmu so we can */
stw r9,8(r1)
stw r11,12(r1)
stw r3,ORIG_GPR3(r1)
+ /*
+ * The trace_hardirqs_off will use CALLER_ADDR0 and CALLER_ADDR1.
+ * If from user mode there is only one stack frame on the stack, and
+ * accessing CALLER_ADDR1 will cause oops. So we need create a dummy
+ * stack frame to make trace_hardirqs_off happy.
+ */
+ andi. r12,r12,MSR_PR
+ beq 11f
+ stwu r1,-16(r1)
+ bl trace_hardirqs_off
+ addi r1,r1,16
+ b 12f
+
+11:
bl trace_hardirqs_off
+12:
lwz r0,GPR0(r1)
lwz r3,ORIG_GPR3(r1)
lwz r4,GPR4(r1)