FAILED: Patch "LoongArch: Use %px to print unmodified unwinding address" failed to apply to 6.12-stable tree

FAILED: Patch "LoongArch: Use %px to print unmodified unwinding address" failed to apply to 6.12-stable tree

[Sasha Levin]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 77403a06d845db1caf9a6b0867b43e9dd8de8e4a Mon Sep 17 00:00:00 2001
From: Tiezhu Yang <yangtiezhu@loongson.cn>
Date: Tue, 10 Feb 2026 19:31:13 +0800
Subject: [PATCH] LoongArch: Use %px to print unmodified unwinding address

Currently, use %p to prevent leaking information about the kernel memory
layout when printing the PC address, but the kernel log messages are not
useful to debug problem if bt_address() returns 0. Given that the type of
"pc" variable is unsigned long, it should use %px to print the unmodified
unwinding address.

Cc: stable@vger.kernel.org
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
 arch/loongarch/kernel/unwind_orc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/unwind_orc.c b/arch/loongarch/kernel/unwind_orc.c
index 8a6e3429a860e..d6b3688a1ce97 100644
--- a/arch/loongarch/kernel/unwind_orc.c
+++ b/arch/loongarch/kernel/unwind_orc.c
@@ -494,7 +494,7 @@ bool unwind_next_frame(struct unwind_state *state)
 
 	state->pc = bt_address(pc);
 	if (!state->pc) {
-		pr_err("cannot find unwind pc at %p\n", (void *)pc);
+		pr_err("cannot find unwind pc at %px\n", (void *)pc);
 		goto err;
 	}
 
-- 
2.51.0

Re: FAILED: Patch "LoongArch: Use %px to print unmodified unwinding address" failed to apply to 6.12-stable tree

[Huacai Chen]

Hi, Sasha,

On Sun, Mar 1, 2026 at 9:27 AM Sasha Levin <sashal@kernel.org> wrote:
>
> The patch below does not apply to the 6.12-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
I'm very confused because it can be applied and already here:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-6.12

Huacai

>
> Thanks,
> Sasha
>
> ------------------ original commit in Linus's tree ------------------
>
> From 77403a06d845db1caf9a6b0867b43e9dd8de8e4a Mon Sep 17 00:00:00 2001
> From: Tiezhu Yang <yangtiezhu@loongson.cn>
> Date: Tue, 10 Feb 2026 19:31:13 +0800
> Subject: [PATCH] LoongArch: Use %px to print unmodified unwinding address
>
> Currently, use %p to prevent leaking information about the kernel memory
> layout when printing the PC address, but the kernel log messages are not
> useful to debug problem if bt_address() returns 0. Given that the type of
> "pc" variable is unsigned long, it should use %px to print the unmodified
> unwinding address.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
> ---
>  arch/loongarch/kernel/unwind_orc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/loongarch/kernel/unwind_orc.c b/arch/loongarch/kernel/unwind_orc.c
> index 8a6e3429a860e..d6b3688a1ce97 100644
> --- a/arch/loongarch/kernel/unwind_orc.c
> +++ b/arch/loongarch/kernel/unwind_orc.c
> @@ -494,7 +494,7 @@ bool unwind_next_frame(struct unwind_state *state)
>
>         state->pc = bt_address(pc);
>         if (!state->pc) {
> -               pr_err("cannot find unwind pc at %p\n", (void *)pc);
> +               pr_err("cannot find unwind pc at %px\n", (void *)pc);
>                 goto err;
>         }
>
> --
> 2.51.0
>
>
>
>
>