x86/entry/64: Avoid pointless code when CONTEXT_TRACKING=n
authorThomas Gleixner <tglx@linutronix.de>
Tue, 25 Feb 2020 22:16:08 +0000 (23:16 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 11 Jun 2020 13:14:34 +0000 (15:14 +0200)
commit725005897ec4ba07d6227a1ac3121048153eb3ce
treee978e712ea5ffba49363bbddbb0b3db7849d11c7
parente9660391d0ebd174b169af3d6de680c2f836027c
x86/entry/64: Avoid pointless code when CONTEXT_TRACKING=n

GAS cannot optimize out the test and conditional jump when context tracking
is disabled and CALL_enter_from_user_mode is an empty macro.

Wrap it in #ifdeffery. Will go away once all this is moved to C.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134058.955968069@linutronix.de
arch/x86/entry/entry_64.S