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parisc: BTLB: Fix crash when setting up BTLB at CPU bringup

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commit 913b9d443a 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: e5ef93d02d ("parisc: BTLB: Initialize BTLB tables at CPU startup")
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v6.6+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller 2024-01-31 13:37:25 +01:00 committed by Greg Kroah-Hartman
parent 2524299b61
commit 54944f4547
1 changed files with 1 additions and 1 deletions
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2
arch/parisc/kernel/cache.c
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@ -58,7 +58,7 @@ int pa_serialize_tlb_flushes __ro_after_init;
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);