• Peter Zijlstra's avatar
    x86/tsc: Remodel cyc2ns to use seqcount_latch() · 59eaef78
    Peter Zijlstra authored
    Replace the custom multi-value scheme with the more regular
    seqcount_latch() scheme. Along with scrapping a lot of lines, the latch
    scheme is better documented and used in more places.
    The immediate benefit however is not being limited on the update side.
    The current code has a limit where the writers block which is hit by
    future changes.
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
core.c 58.9 KB