• Peter Zijlstra's avatar
    arch, mm: Remove tlb_fast_mode() · 29eb7782
    Peter Zijlstra authored
    Since the introduction of preemptible mmu_gather TLB fast mode has been
    broken. TLB fast mode relies on there being absolutely no concurrency;
    it frees pages first and invalidates TLBs later.
    
    However now we can get concurrency and stuff goes *bang*.
    
    This patch removes all tlb_fast_mode() code; it was found the better
    option vs trying to patch the hole by entangling tlb invalidation with
    the scheduler.
    
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Russell King <linux@arm.linux.org.uk>
    Cc: Tony Luck <tony.luck@intel.com>
    Reported-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
    Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    29eb7782
tlb.h 6.91 KB