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To: Thomas Huth <thuth@redhat.com>, linuxppc-dev@lists.ozlabs.org,
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From: Michael Ellerman <mpe@ellerman.id.au>
Cc: paulus@samba.org, anton@samba.org, kvm-ppc@vger.kernel.org
Subject: Re: powerpc/rtas: Introduce rtas_get_sensor_fast() for IRQ handlers
Message-Id: <20150722112527.B36E01402C8@ozlabs.org>
Date: Wed, 22 Jul 2015 21:25:27 +1000 (AEST)
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On Fri, 2015-17-07 at 10:46:58 UTC, Thomas Huth wrote:
> The EPOW interrupt handler uses rtas_get_sensor(), which in turn
> uses rtas_busy_delay() to wait for RTAS becoming ready in case it
> is necessary. But rtas_busy_delay() is annotated with might_sleep()
> and thus may not be used by interrupts handlers like the EPOW handler!
> This leads to the following BUG when CONFIG_DEBUG_ATOMIC_SLEEP is
> enabled:

When did we break this?

cheers