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FAILED: Patch "LoongArch: Guard percpu handler under !CONFIG_PREEMPT_RT" failed to apply to 6.12-stable tree

PATCH Sasha Levin 2 participants 2 messages Mar 1

Subsystems (3)
Stable branch LoongArch Real-time Linux (PREEMPT_RT)
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Sasha Levin

author maintainer
#0 lore raw

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 <[email protected]>.

Thanks,
Sasha

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

From 70b0faae3590c628a98a627a10e5d211310169d4 Mon Sep 17 00:00:00 2001
From: Tiezhu Yang <[email protected]>
Date: Tue, 10 Feb 2026 19:31:13 +0800
Subject: [PATCH] LoongArch: Guard percpu handler under !CONFIG_PREEMPT_RT

After commit 88fd2b70120d ("LoongArch: Fix sleeping in atomic context for PREEMPT_RT"), it should guard percpu handler under !CONFIG_PREEMPT_RT to avoid redundant operations.

Cc [email protected]
Signed-off-by Tiezhu Yang <[email protected]>
Signed-off-by Huacai Chen <[email protected]>
---
 arch/loongarch/kernel/unwind_prologue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
arch/loongarch/kernel/unwind_prologue.c +1 -1
index 729e775bd40dd..ee1c29686ab05 100644
@@ -65,7 +65,7 @@ static inline bool scan_handlers(unsigned long entry_offset)
 
 static inline bool fix_exception(unsigned long pc)
 {
-#ifdef CONFIG_NUMA
+#if defined(CONFIG_NUMA) && !defined(CONFIG_PREEMPT_RT)
 	int cpu;
 
 	for_each_possible_cpu(cpu) {
Signature · 1 line
2.51.0
maintainer
#1 lore raw

Hi, Sasha,

Quoted 5 lines · 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 <[email protected]>.

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

Quoted 42 lines

Thanks,
Sasha

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

From 70b0faae3590c628a98a627a10e5d211310169d4 Mon Sep 17 00:00:00 2001
From: Tiezhu Yang <[email protected]>
Date: Tue, 10 Feb 2026 19:31:13 +0800
Subject: [PATCH] LoongArch: Guard percpu handler under !CONFIG_PREEMPT_RT

After commit 88fd2b70120d ("LoongArch: Fix sleeping in atomic context for PREEMPT_RT"), it should guard percpu handler under !CONFIG_PREEMPT_RT to avoid redundant operations.

Cc [email protected]
Signed-off-by Tiezhu Yang <[email protected]>
Signed-off-by Huacai Chen <[email protected]>
---
 arch/loongarch/kernel/unwind_prologue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
arch/loongarch/kernel/unwind_prologue.c +1 -2
index 729e775bd40dd..ee1c29686ab05 100644
@@ -65,7 +65,7 @@ static inline bool scan_handlers(unsigned long entry_offset)
 
 static inline bool fix_exception(unsigned long pc)
 {
-#ifdef CONFIG_NUMA
+#if defined(CONFIG_NUMA) && !defined(CONFIG_PREEMPT_RT)
        int cpu;
 
        for_each_possible_cpu(cpu) {
--

2.51.0