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powerpc/ftrace: Fix stack teardown in ftrace_no_trace 

commit 4b3338aaa74d7d4ec5b6734dc298f0db94ec83d2 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 2023-11-30 12:29:47 +05:30 committed by Greg Kroah-Hartman
parent 903a1a1949
commit fd72844980
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/kernel/trace/ftrace_entry.S
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@ -62,7 +62,7 @@
.endif .endif
/* Save previous stack pointer (r1) */ /* 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) PPC_STL r8, GPR1(r1)
.if \allregs == 1 .if \allregs == 1
@ -182,7 +182,7 @@ ftrace_no_trace:
mflr r3 mflr r3
mtctr r3 mtctr r3
REST_GPR(3, r1) REST_GPR(3, r1)
addi r1, r1, SWITCH_FRAME_SIZE addi r1, r1, SWITCH_FRAME_SIZE+STACK_FRAME_MIN_SIZE
mtlr r0 mtlr r0
bctr bctr
#endif #endif