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    Revert "x86/speculation: Simplify indirect_branch_prediction_barrier()" · f208820a
    David Woodhouse 提交于
    This reverts commit 64e16720.
    
    We cannot call C functions like that, without marking all the
    call-clobbered registers as, well, clobbered. We might have got away
    with it for now because the __ibp_barrier() function was *fairly*
    unlikely to actually use any other registers. But no. Just no.
    Signed-off-by: NDavid Woodhouse <dwmw@amazon.co.uk>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Arjan van de Ven <arjan@linux.intel.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: arjan.van.de.ven@intel.com
    Cc: dave.hansen@intel.com
    Cc: jmattson@google.com
    Cc: karahmed@amazon.de
    Cc: kvm@vger.kernel.org
    Cc: pbonzini@redhat.com
    Cc: rkrcmar@redhat.com
    Cc: sironi@amazon.de
    Link: http://lkml.kernel.org/r/1518305967-31356-3-git-send-email-dwmw@amazon.co.ukSigned-off-by: NIngo Molnar <mingo@kernel.org>
    f208820a
nospec-branch.h 4.6 KB