[PATCH v9 04/11] arm64: Make return_address() use arch_stack_walk()

madvenka
2021-10-15T02:35:06Z

From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>

Currently, return_address() in ARM64 code walks the stack using
start_backtrace() and walk_stackframe(). Make it use arch_stack_walk()
instead. This makes maintenance easier.

Signed-off-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com>
---
arch/arm64/kernel/return_address.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/return_address.c b/arch/arm64/kernel/return_address.c
index a6d18755652f..92a0f4d434e4 100644
--- a/arch/arm64/kernel/return_address.c
+++ b/arch/arm64/kernel/return_address.c
@@ -35,15 +35,11 @@ NOKPROBE_SYMBOL(save_return_addr);
void *return_address(unsigned int level)
{
struct return_address_data data;
- struct stackframe frame;

data.level = level + 2;
data.addr = NULL;

- start_backtrace(&frame,
- (unsigned long)__builtin_frame_address(0),
- (unsigned long)return_address);
- walk_stackframe(current, &frame, save_return_addr, &data);
+ arch_stack_walk(save_return_addr, &data, current, NULL);

if (!data.level)
return data.addr;
--
2.25.1