On Mon, Dec 03, 2018 at 06:06:11PM +0000, James Morse wrote:

APEI is unable to do all of its error handling work in nmi-context, so
it defers non-fatal work onto the irq_work queue. arch_irq_work_raise()
sends an IPI to the calling cpu, but this is not guaranteed to be taken
before returning to user-space.

Unless the exception interrupted a context with irqs-masked,
irq_work_run() can run immediately. Otherwise return -EINPROGRESS to
indicate ghes_notify_sea() found some work to do, but it hasn't
finished yet.

With this apei_claim_sea() returning '0' means this external-abort was
also notification of a firmware-first RAS error, and that APEI has
processed the CPER records.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Punit Agrawal <redacted>
Tested-by: Tyler Baicar <redacted>
CC: Xie XiuQi <redacted>
CC: gengdongjiu <redacted>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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