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authorMark Rutland <mark.rutland@arm.com>2017-07-20 15:01:01 +0200
committerMark Rutland <mark.rutland@arm.com>2017-08-08 17:28:25 +0200
commit096683724cb2eb95fea759a2580996df1039fdd0 (patch)
tree78e44f1a2d401822f5fd45b721efca323fd5415a /arch/arm64/kernel/entry.S
parentarm64: move non-entry code out of .entry.text (diff)
downloadlinux-096683724cb2eb95fea759a2580996df1039fdd0.tar.xz
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arm64: unwind: avoid percpu indirection for irq stack
Our IRQ_STACK_PTR() and on_irq_stack() helpers both take a cpu argument, used to generate a percpu address. In all cases, they are passed {raw_,}smp_processor_id(), so this parameter is redundant. Since {raw_,}smp_processor_id() use a percpu variable internally, this approach means we generate a percpu offset to find the current cpu, then use this to index an array of percpu offsets, which we then use to find the current CPU's IRQ stack pointer. Thus, most of the work is redundant. Instead, we can consistently use raw_cpu_ptr() to generate the CPU's irq_stack pointer by simply adding the percpu offset to the irq_stack address, which is simpler in both respects. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/entry.S')
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