This is a note to let you know that I've just added the patch titled
powerpc/ftrace: Fix stack teardown in ftrace_no_trace
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-ftrace-fix-stack-teardown-in-ftrace_no_trace.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4b3338aaa74d7d4ec5b6734dc298f0db94ec83d2 Mon Sep 17 00:00:00 2001
From: Naveen N Rao <naveen@xxxxxxxxxx>
Date: Thu, 30 Nov 2023 12:29:47 +0530
Subject: powerpc/ftrace: Fix stack teardown in ftrace_no_trace
From: Naveen N Rao <naveen@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx # v6.5+
Signed-off-by: Naveen N Rao <naveen@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20231130065947.2188860-1-naveen@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/trace/ftrace_entry.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/powerpc/kernel/trace/ftrace_entry.S
+++ b/arch/powerpc/kernel/trace/ftrace_entry.S
@@ -62,7 +62,7 @@
.endif
/* Save previous stack pointer (r1) */
- addi r8, r1, SWITCH_FRAME_SIZE
+ addi r8, r1, SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE
PPC_STL r8, GPR1(r1)
.if \allregs == 1
@@ -182,7 +182,7 @@ 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
#endif
Patches currently in stable-queue which might be from naveen@xxxxxxxxxx are
queue-6.6/powerpc-ftrace-fix-stack-teardown-in-ftrace_no_trace.patch
