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powerpc/ftrace: Fix stack teardown in ftrace_no_trace

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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 16:44:33 +05:30
committed by Greg Kroah-Hartman
parent 4624f5f298
commit fa5f992dcf
1 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/powerpc/kernel/trace/ftrace_64_mprofile.S
+2 -2
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@@ -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