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

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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

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[PATCH v3 0/4] x86/mm: Straightforward TLB flush fixes/cleanups Andy Lutomirski <luto@kernel.org> - 2017-04-22 09:10 +0200
  [PATCH v3 4/4] x86/mm: Fix flush_tlb_page() on Xen Andy Lutomirski <luto@kernel.org> - 2017-04-22 09:10 +0200
  [PATCH v3 2/4] x86/mm: Remove flush_tlb() and flush_tlb_current_task() Andy Lutomirski <luto@kernel.org> - 2017-04-22 09:10 +0200
  [PATCH v3 3/4] x86/mm: Make flush_tlb_mm_range() more predictable Andy Lutomirski <luto@kernel.org> - 2017-04-22 09:10 +0200
  [PATCH v3 1/4] x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly() Andy Lutomirski <luto@kernel.org> - 2017-04-22 09:10 +0200

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