FAILED: patch "[PATCH] powerpc/ftrace: Fix stack teardown in ftrace_no_trace" failed to apply to 6.1-stable tree

FAILED: patch "[PATCH] powerpc/ftrace: Fix stack teardown in ftrace_no_trace" failed to apply to 6.1-stable tree

[gregkh]

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 4b3338aaa74d7d4ec5b6734dc298f0db94ec83d2
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023121112-image-dreadlock-4677@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

4b3338aaa74d ("powerpc/ftrace: Fix stack teardown in ftrace_no_trace")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 4b3338aaa74d7d4ec5b6734dc298f0db94ec83d2 Mon Sep 17 00:00:00 2001
From: Naveen N Rao <naveen@kernel.org>
Date: Thu, 30 Nov 2023 12:29:47 +0530
Subject: [PATCH] powerpc/ftrace: Fix stack teardown in ftrace_no_trace

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 <naveen@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231130065947.2188860-1-naveen@kernel.org

diff --git a/arch/powerpc/kernel/trace/ftrace_entry.S b/arch/powerpc/kernel/trace/ftrace_entry.S
index 90701885762c..40677416d7b2 100644
--- 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