This is a note to let you know that I've just added the patch titled
parisc: Extend disabled preemption in copy_user_page
to the 4.9-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-extend-disabled-preemption-in-copy_user_page.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 56008c04ebc099940021b714da2d7779117cf6a7 Mon Sep 17 00:00:00 2001
From: John David Anglin <dave.anglin@xxxxxxxx>
Date: Tue, 25 Jul 2017 17:23:35 -0400
Subject: parisc: Extend disabled preemption in copy_user_page
From: John David Anglin <dave.anglin@xxxxxxxx>
commit 56008c04ebc099940021b714da2d7779117cf6a7 upstream.
It's always bothered me that we only disable preemption in
copy_user_page around the call to flush_dcache_page_asm.
This patch extends this to after the copy.
Signed-off-by: John David Anglin <dave.anglin@xxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
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
@@ -452,8 +452,8 @@ void copy_user_page(void *vto, void *vfr
before it can be accessed through the kernel mapping. */
preempt_disable();
flush_dcache_page_asm(__pa(vfrom), vaddr);
- preempt_enable();
copy_page_asm(vto, vfrom);
+ preempt_enable();
}
EXPORT_SYMBOL(copy_user_page);
Patches currently in stable-queue which might be from dave.anglin@xxxxxxxx are
queue-4.9/parisc-prevent-tlb-speculation-on-flushed-pages-on-cpus-that-only-support-equivalent-aliases.patch
queue-4.9/parisc-extend-disabled-preemption-in-copy_user_page.patch