linux-kernel - [tip:x86/mm] x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen

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Message-ID: <tip-9ccee2373f0658f234727700e619df097ba57023@git.kernel.org>
Date:   Wed, 26 Apr 2017 01:26:29 -0700
From:   tip-bot for Andy Lutomirski <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jpoimboe@...hat.com, tglx@...utronix.de, mhocko@...e.com,
        linux-kernel@...r.kernel.org, brgerst@...il.com,
        sasha.levin@...cle.com, hpa@...or.com, dvlasenk@...hat.com,
        dave.hansen@...el.com, peterz@...radead.org, luto@...nel.org,
        akpm@...ux-foundation.org, mingo@...nel.org, bp@...en8.de,
        riel@...hat.com, torvalds@...ux-foundation.org, namit@...are.com
Subject: [tip:x86/mm] x86/vm86/32: Switch to flush_tlb_mm_range() in
 mark_screen_rdonly()

Commit-ID:  9ccee2373f0658f234727700e619df097ba57023
Gitweb:     http://git.kernel.org/tip/9ccee2373f0658f234727700e619df097ba57023
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Sat, 22 Apr 2017 00:01:19 -0700
Committer:  Ingo Molnar <mingo@...nel.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@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Nadav Amit <namit@...are.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Sasha Levin <sasha.levin@...cle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/791a644076fc3577ba7f7b7cafd643cc089baa7d.1492844372.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.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);
 }