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Commit 0d2c6298 authored by Naveen N Rao's avatar Naveen N Rao Committed by Greg Kroah-Hartman
Browse files

powerpc/ftrace: Fix stack teardown in ftrace_no_trace 



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@vger.kernel.org # v6.5+
Signed-off-by: default avatarNaveen N Rao <naveen@kernel.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231130065947.2188860-1-naveen@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent efe775c7

arch/powerpc/kernel/trace/ftrace_64_mprofile.S

+2 −2
Original line number Diff line number Diff line
@@ -59,7 +59,7 @@ _GLOBAL(ftrace_regs_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 */
@@ -154,7 +154,7 @@ 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