Patch "parisc: Extend disabled preemption in copy_user_page" has been added to the 4.9-stable tree

Patch "parisc: Extend disabled preemption in copy_user_page" has been added to the 4.9-stable tree

[gregkh]

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@vger.kernel.org> know about it.


>From 56008c04ebc099940021b714da2d7779117cf6a7 Mon Sep 17 00:00:00 2001
From: John David Anglin <dave.anglin@bell.net>
Date: Tue, 25 Jul 2017 17:23:35 -0400
Subject: parisc: Extend disabled preemption in copy_user_page

From: John David Anglin <dave.anglin@bell.net>

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@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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@bell.net 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