• Frederic Weisbecker's avatar
    context-tracking: Introduce CONFIG_HAVE_TIF_NOHZ · 490f561b
    Frederic Weisbecker authored
    A few archs (x86, arm, arm64) don't rely anymore on TIF_NOHZ to call
    into context tracking on user entry/exit but instead use static keys
    (or not) to optimize those calls. Ideally every arch should migrate to
    that behaviour in the long run.
    
    Settle a config option to let those archs remove their TIF_NOHZ
    definitions.
    Signed-off-by: default avatarFrederic Weisbecker <frederic@kernel.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Russell King <linux@armlinux.org.uk>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Will Deacon <will@kernel.org>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: Paul Burton <paulburton@kernel.org>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: David S. Miller <davem@davemloft.net>
    490f561b
Kconfig 37 KB