Patch "x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

    x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()

to the 4.4-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:

     x86-vm86-32-switch-to-flush_tlb_mm_range-in-mark_screen_rdonly.patch

and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andy Lutomirski <[email protected]>
Date: Sat, 22 Apr 2017 00:01:19 -0700
Subject: x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()

From: Andy Lutomirski <[email protected]>

commit 9ccee2373f0658f234727700e619df097ba57023 upstream.

mark_screen_rdonly() is the last remaining caller of flush_tlb(). flush_tlb_mm_range() is potentially faster and isn't obsolete.

Compile-tested only because I don't know whether software that uses this mechanism even exists.

---
 arch/x86/kernel/vm86_32.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -187,7 +187,7 @@ static void mark_screen_rdonly(struct mm
 	pte_unmap_unlock(pte, ptl);
 out:
 	up_write(&mm->mmap_sem);
-	flush_tlb();
+	flush_tlb_mm_range(mm, 0xA0000, 0xA0000 + 32*PAGE_SIZE, 0UL);
 }
 
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/x86-vm86-32-switch-to-flush_tlb_mm_range-in-mark_screen_rdonly.patch queue-4.4/x86-mm-make-flush_tlb_mm_range-more-predictable.patch queue-4.4/x86-mm-remove-flush_tlb-and-flush_tlb_current_task.patch