[tip:x86/mm] x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()

[tip-bot for Andy Lutomirski <tipbot@zytor.com>]

Commit-ID:  9ccee2373f0658f234727700e619df097ba57023
Gitweb:     http://git.kernel.org/tip/9ccee2373f0658f234727700e619df097ba57023
Author:     Andy Lutomirski <luto@kernel.org>
AuthorDate: Sat, 22 Apr 2017 00:01:19 -0700
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 26 Apr 2017 10:02:06 +0200

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

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

diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 62597c3..7924a53 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -197,7 +197,7 @@ static void mark_screen_rdonly(struct mm_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);
 }