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riscv: stacktrace: Fixup ftrace_graph_ret_addr retp argument

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The 'retp' is a pointer to the return address on the stack, so we
must pass the current return address pointer as the 'retp'
argument to ftrace_push_return_trace(). Not parent function's
return address on the stack.

Fixes: b785ec129bd9 ("riscv/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support")
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20221109064937.3643993-2-guoren@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Guo Ren 2022-11-09 01:49:36 -05:00 committed by Palmer Dabbelt
parent cbc32023dd
commit 5c3022e4a6
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1 changed files with 1 additions and 1 deletions
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arch/riscv/kernel/stacktrace.c
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@ -58,7 +58,7 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
} else { } else {
fp = frame->fp; fp = frame->fp;
pc = ftrace_graph_ret_addr(current, NULL, frame->ra, pc = ftrace_graph_ret_addr(current, NULL, frame->ra,
(unsigned long *)(fp - 8)); &frame->ra);
} }
} }