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 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
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-4.9 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 9ccee2373f0658f234727700e619df097ba57023 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski luto@kernel.org 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 luto@kernel.org
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.
Signed-off-by: Andy Lutomirski luto@kernel.org Cc: Andrew Morton akpm@linux-foundation.org Cc: Borislav Petkov bp@alien8.de Cc: Brian Gerst brgerst@gmail.com Cc: Dave Hansen dave.hansen@intel.com Cc: Denys Vlasenko dvlasenk@redhat.com Cc: H. Peter Anvin hpa@zytor.com Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Michal Hocko mhocko@suse.com Cc: Nadav Amit namit@vmware.com Cc: Peter Zijlstra peterz@infradead.org Cc: Rik van Riel riel@redhat.com Cc: Sasha Levin sasha.levin@oracle.com Cc: Thomas Gleixner tglx@linutronix.de Link: http://lkml.kernel.org/r/791a644076fc3577ba7f7b7cafd643cc089baa7d.1492844372... Signed-off-by: Ingo Molnar mingo@kernel.org Cc: Hugh Dickins hughd@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kernel/vm86_32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/vm86_32.c +++ b/arch/x86/kernel/vm86_32.c @@ -191,7 +191,7 @@ 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 luto@kernel.org are
queue-4.9/x86-vm86-32-switch-to-flush_tlb_mm_range-in-mark_screen_rdonly.patch queue-4.9/x86-mm-make-flush_tlb_mm_range-more-predictable.patch queue-4.9/x86-mm-remove-flush_tlb-and-flush_tlb_current_task.patch