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    Subject[PATCH 4.14 055/159] x86/entry/64: Shorten TEST instructions
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Borislav Petkov <bp@suse.de>

    commit 1e4c4f610f774df6088d7c065b2dd4d22adba698 upstream.

    Convert TESTL to TESTB and save 3 bytes per callsite.

    No functionality change.

    Signed-off-by: Borislav Petkov <bp@suse.de>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/20171102120926.4srwerqrr7g72e2k@pd.tnic
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/x86/entry/entry_64.S | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/arch/x86/entry/entry_64.S
    +++ b/arch/x86/entry/entry_64.S
    @@ -621,7 +621,7 @@ GLOBAL(retint_user)
    GLOBAL(swapgs_restore_regs_and_return_to_usermode)
    #ifdef CONFIG_DEBUG_ENTRY
    /* Assert that pt_regs indicates user mode. */
    - testl $3, CS(%rsp)
    + testb $3, CS(%rsp)
    jnz 1f
    ud2
    1:
    @@ -654,7 +654,7 @@ retint_kernel:
    GLOBAL(restore_regs_and_return_to_kernel)
    #ifdef CONFIG_DEBUG_ENTRY
    /* Assert that pt_regs indicates kernel mode. */
    - testl $3, CS(%rsp)
    + testb $3, CS(%rsp)
    jz 1f
    ud2
    1:

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