This is a note to let you know that I've just added the patch titled
parisc: Ensure page alignment in flush functions
to the 6.3-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-ensure-page-alignment-in-flush-functions.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d755bd2caeb47fd806e12399fe8b56798fa5d2cc Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Wed, 15 Mar 2023 19:25:15 +0100
Subject: parisc: Ensure page alignment in flush functions
From: Helge Deller <deller@xxxxxx>
commit d755bd2caeb47fd806e12399fe8b56798fa5d2cc upstream.
Matthew Wilcox noticed, that if ARCH_HAS_FLUSH_ON_KUNMAP is defined
(which is the case for PA-RISC), __kunmap_local() calls
kunmap_flush_on_unmap(), which may call the parisc flush functions with
a non-page-aligned address and thus the page might not be fully flushed.
This patch ensures that flush_kernel_dcache_page_asm() and
flush_kernel_dcache_page_asm() will always operate on page-aligned
addresses.
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/pacache.S | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/parisc/kernel/pacache.S
+++ b/arch/parisc/kernel/pacache.S
@@ -889,6 +889,7 @@ ENDPROC_CFI(flush_icache_page_asm)
ENTRY_CFI(flush_kernel_dcache_page_asm)
88: ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
+ depi_safe 0, 31,PAGE_SHIFT, %r26 /* Clear any offset bits */
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
@@ -925,6 +926,7 @@ ENDPROC_CFI(flush_kernel_dcache_page_asm
ENTRY_CFI(purge_kernel_dcache_page_asm)
88: ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
+ depi_safe 0, 31,PAGE_SHIFT, %r26 /* Clear any offset bits */
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-6.3/fbdev-mmp-fix-deferred-clk-handling-in-mmphw_probe.patch
queue-6.3/parisc-ensure-page-alignment-in-flush-functions.patch
queue-6.3/parisc-fix-argument-pointer-in-real64_call_asm.patch
