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arm64: unwind: remove sp from struct stackframe

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The unwind code sets the sp member of struct stackframe to
'frame pointer + 0x10' unconditionally, without regard for whether
doing so produces a legal value. So let's simply remove it now that
we have stopped using it anyway.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Ard Biesheuvel
2017-07-23 09:05:38 +01:00
committed by Mark Rutland
parent 7326749801
commit 31e43ad3b7
7 changed files with 1 additions and 14 deletions
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5
arch/arm64/kernel/process.c
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@@ -382,15 +382,12 @@ unsigned long get_wchan(struct task_struct *p)
return 0;
frame.fp = thread_saved_fp(p);
frame.sp = thread_saved_sp(p);
frame.pc = thread_saved_pc(p);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = p->curr_ret_stack;
#endif
do {
if (frame.sp < stack_page ||
frame.sp >= stack_page + THREAD_SIZE ||
unwind_frame(p, &frame))
if (unwind_frame(p, &frame))
goto out;
if (!in_sched_functions(frame.pc)) {
ret = frame.pc;