| 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.git.luto@kernel.org |
| 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); |
| } |
| |
| |