From fa5f992dcf89452229ecca7e3c5e9c883242bf0b Mon Sep 17 00:00:00 2001 From: Naveen N Rao Date: Fri, 15 Dec 2023 16:44:33 +0530 Subject: [PATCH] powerpc/ftrace: Fix stack teardown in ftrace_no_trace commit 4b3338aaa74d7d4ec5b6734dc298f0db94ec83d2 upstream. Commit 41a506ef71eb ("powerpc/ftrace: Create a dummy stackframe to fix stack unwind") added use of a new stack frame on ftrace entry to fix stack unwind. However, the commit missed updating the offset used while tearing down the ftrace stack when ftrace is disabled. Fix the same. In addition, the commit missed saving the correct stack pointer in pt_regs. Update the same. Fixes: 41a506ef71eb ("powerpc/ftrace: Create a dummy stackframe to fix stack unwind") Cc: stable@vger.kernel.org # v6.5+ Signed-off-by: Naveen N Rao Signed-off-by: Michael Ellerman Link: https://msgid.link/20231130065947.2188860-1-naveen@kernel.org Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/trace/ftrace_64_mprofile.S b/arch/powerpc/kernel/trace/ftrace_64_mprofile.S index 0b827a4b727f..5b6ea1c33998 100644 --- a/arch/powerpc/kernel/trace/ftrace_64_mprofile.S +++ b/arch/powerpc/kernel/trace/ftrace_64_mprofile.S @@ -54,7 +54,7 @@ _GLOBAL(ftrace_regs_caller) SAVE_GPRS(12, 31, r1) /* Save previous stack pointer (r1) */ - addi r8, r1, SWITCH_FRAME_SIZE + addi r8, r1, SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE std r8, GPR1(r1) /* Load special regs for save below */ @@ -147,7 +147,7 @@ ftrace_no_trace: mflr r3 mtctr r3 REST_GPR(3, r1) - addi r1, r1, SWITCH_FRAME_SIZE + addi r1, r1, SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE mtlr r0 bctr