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powerpc/ftrace: Fix stack teardown in ftrace_no_trace 

commit 4b3338aaa7 upstream.

Commit 41a506ef71 ("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: 41a506ef71 ("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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen N Rao 2023-12-15 16:41:22 +05:30 committed by Greg Kroah-Hartman
parent ae9be85078
commit 75fbe0d9d5
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/trace/ftrace_64_mprofile.S
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@ -54,7 +54,7 @@ _GLOBAL(ftrace_caller)
SAVE_10GPRS(22, 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 */