This is a note to let you know that I've just added the patch titled
parisc: Use num_present_cpus() in alternative patching code
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
parisc-use-num_present_cpus-in-alternative-patching-code.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b6405f0829d7b1dd926ba3ca5f691cab835abfaa Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Fri, 19 May 2023 12:12:06 +0200
Subject: parisc: Use num_present_cpus() in alternative patching code
From: Helge Deller <deller@xxxxxx>
commit b6405f0829d7b1dd926ba3ca5f691cab835abfaa upstream.
When patching the kernel code some alternatives depend on SMP vs. !SMP.
Use the value of num_present_cpus() instead of num_online_cpus() to
decide, otherwise we may run into issues if and additional CPU is
enabled after having loaded a module while only one CPU was enabled.
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.1+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/alternative.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/parisc/kernel/alternative.c b/arch/parisc/kernel/alternative.c
index 66f5672c70bd..25c4d6c3375d 100644
--- a/arch/parisc/kernel/alternative.c
+++ b/arch/parisc/kernel/alternative.c
@@ -25,7 +25,7 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
{
struct alt_instr *entry;
int index = 0, applied = 0;
- int num_cpus = num_online_cpus();
+ int num_cpus = num_present_cpus();
u16 cond_check;
cond_check = ALT_COND_ALWAYS |
--
2.40.1
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-6.1/parisc-allow-to-reboot-machine-after-system-halt.patch
queue-6.1/parisc-handle-kgdb-breakpoints-only-in-kernel-context.patch
queue-6.1/parisc-handle-kprobes-breakpoints-only-in-kernel-context.patch
queue-6.1/parisc-use-num_present_cpus-in-alternative-patching-code.patch
queue-6.1/parisc-fix-flush_dcache_page-for-usage-from-irq-context.patch
queue-6.1/parisc-enable-lockdep-support.patch
