Patch "powerpc/ftrace: Fix stack teardown in ftrace_no_trace" has been added to the 5.15-stable tree

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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 5.15-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-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From stable+bounces-6808-greg=kroah.com@xxxxxxxxxxxxxxx Fri Dec 15 12:18:31 2023
From: Naveen N Rao <naveen@xxxxxxxxxx>
Date: Fri, 15 Dec 2023 16:44:33 +0530
Subject: powerpc/ftrace: Fix stack teardown in ftrace_no_trace
To: <stable@xxxxxxxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Message-ID: <20231215111433.2362641-2-naveen@xxxxxxxxxx>

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_64_mprofile.S |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 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
 


Patches currently in stable-queue which might be from kroah.com@xxxxxxxxxxxxxxx are

queue-5.15/powerpc-ftrace-create-a-dummy-stackframe-to-fix-stack-unwind.patch
queue-5.15/powerpc-ftrace-fix-stack-teardown-in-ftrace_no_trace.patch




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