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    Subject[PATCH 4.1 13/65] x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()
    Date
    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>
    (cherry picked from commit 6ce9d1e6819e53c4de0bf980555c4e07bbedb4ce)
    Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
    ---
    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 fc9db6ef2a95..e0ae0a8ad5bd 100644
    --- a/arch/x86/kernel/vm86_32.c
    +++ b/arch/x86/kernel/vm86_32.c
    @@ -194,7 +194,7 @@ 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);
    }


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    2.16.2
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