[PATCH v3 1/4] x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()

From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@kernel.org>, Rik van Riel <riel@redhat.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Nadav Amit <namit@vmware.com>, Michal Hocko <mhocko@suse.com>,
	Sasha Levin <sasha.levin@oracle.com>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v3 1/4] x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()
Date: Sat, 22 Apr 2017 00:01:19 -0700	[thread overview]
Message-ID: <791a644076fc3577ba7f7b7cafd643cc089baa7d.1492844372.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1492844372.git.luto@kernel.org>
In-Reply-To: <cover.1492844372.git.luto@kernel.org>

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.

Cc: Rik van Riel <riel@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andy Lutomirski <luto@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 23ee89ce59a9..3eda76b3c835 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -193,7 +193,7 @@ 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);
 }
 
 
-- 
2.9.3
