• Brian Gerst's avatar
    x86/alternatives: Discard dynamic check after init · 2476f2fa
    Brian Gerst authored
    Move the code to do the dynamic check to the altinstr_aux
    section so that it is discarded after alternatives have run and
    a static branch has been chosen.
    
    This way we're changing the dynamic branch from C code to
    assembly, which makes it *substantially* smaller while avoiding
    a completely unnecessary call to an out of line function.
    Signed-off-by: default avatarBrian Gerst <brgerst@gmail.com>
    [ Changed it to do TESTB, as hpa suggested. ]
    Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Young <dyoung@redhat.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Kristen Carlson Accardi <kristen@linux.intel.com>
    Cc: Laura Abbott <labbott@fedoraproject.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Prarit Bhargava <prarit@redhat.com>
    Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/1452972124-7380-1-git-send-email-brgerst@gmail.com
    Link: http://lkml.kernel.org/r/20160127084525.GC30712@pd.tnicSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    2476f2fa
common.c 35.4 KB