linux-arm.git - Russell King's ARM Linux kernel tree

Age	Commit message (Collapse)	Author
2019-12-08	sched/rt, arm64: Use CONFIG_PREEMPTION	Thomas Gleixner
	CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same functionality which today depends on CONFIG_PREEMPT. Switch the Kconfig dependency, entry code and preemption handling over to use CONFIG_PREEMPTION. Add PREEMPT_RT output in show_stack(). [bigeasy: +traps.c, Kconfig] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20191015191821.11479-3-bigeasy@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-12-07	arm64: preempt: Provide our own implementation of asm/preempt.h	Will Deacon
	The asm-generic/preempt.h implementation doesn't make use of the PREEMPT_NEED_RESCHED flag, since this can interact badly with load/store architectures which rely on the preempt_count word being unchanged across an interrupt. However, since we're a 64-bit architecture and the preempt count is only 32 bits wide, we can simply pack it next to the resched flag and load the whole thing in one go, so that a dec-and-test operation doesn't need to load twice. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>