This is a note to let you know that I've just added the patch titled
parisc: BTLB: Fix crash when setting up BTLB at CPU bringup
to the 6.7-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-btlb-fix-crash-when-setting-up-btlb-at-cpu-bringup.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 913b9d443a0180cf0de3548f1ab3149378998486 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Wed, 31 Jan 2024 13:37:25 +0100
Subject: parisc: BTLB: Fix crash when setting up BTLB at CPU bringup
From: Helge Deller <deller@xxxxxx>
commit 913b9d443a0180cf0de3548f1ab3149378998486 upstream.
When using hotplug and bringing up a 32-bit CPU, ask the firmware about the
BTLB information to set up the static (block) TLB entries.
For that write access to the static btlb_info struct is needed, but
since it is marked __ro_after_init the kernel segfaults with missing
write permissions.
Fix the crash by dropping the __ro_after_init annotation.
Fixes: e5ef93d02d6c ("parisc: BTLB: Initialize BTLB tables at CPU startup")
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.6+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/cache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -58,7 +58,7 @@ int pa_serialize_tlb_flushes __ro_after_
struct pdc_cache_info cache_info __ro_after_init;
#ifndef CONFIG_PA20
-struct pdc_btlb_info btlb_info __ro_after_init;
+struct pdc_btlb_info btlb_info;
#endif
DEFINE_STATIC_KEY_TRUE(parisc_has_cache);
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-6.7/parisc-btlb-fix-crash-when-setting-up-btlb-at-cpu-bringup.patch
queue-6.7/parisc-prevent-hung-tasks-when-printing-inventory-on-serial-console.patch
queue-6.7/parisc-fix-random-data-corruption-from-exception-handler.patch
