linux-kernel - Re: [v2,3/9] powerpc: mpc52xx_gpt: make use of raw

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Date:   Mon, 29 Jan 2018 15:13:45 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Julia Cartwright <julia@...com>,
        Anatolij Gustschin <agust@...x.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org
Subject: Re: [v2,3/9] powerpc: mpc52xx_gpt: make use of raw_spinlock variants

On Tue, 2017-03-21 at 22:43:03 UTC, Julia Cartwright wrote:
> The mpc52xx_gpt code currently implements an irq_chip for handling
> interrupts; due to how irq_chip handling is done, it's necessary for the
> irq_chip methods to be invoked from hardirq context, even on a a
> real-time kernel.  Because the spinlock_t type becomes a "sleeping"
> spinlock w/ RT kernels, it is not suitable to be used with irq_chips.
> 
> A quick audit of the operations under the lock reveal that they do only
> minimal, bounded work, and are therefore safe to do under a raw spinlock.
> 
> Signed-off-by: Julia Cartwright <julia@...com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/77720c82915a8b7797e0041af95707

cheers