• Andy Lutomirski's avatar
    x86/entry: Call enter_from_user_mode() with IRQs off · 9999c8c0
    Andy Lutomirski authored
    Now that slow-path syscalls always enter C before enabling
    interrupts, it's straightforward to call enter_from_user_mode() before
    enabling interrupts rather than doing it as part of entry tracing.
    
    With this change, we should finally be able to retire exception_enter().
    
    This will also enable optimizations based on knowing that we never
    change context tracking state with interrupts on.
    Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Frédéric Weisbecker <fweisbec@gmail.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/bc376ecf87921a495e874ff98139b1ca2f5c5dd7.1457558566.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    9999c8c0
common.c 13.1 KB