Re: random: GFP_KERNEL from irq context

From: Jens Axboe
Date: Fri Apr 27 2018 - 00:12:16 EST

On 4/26/18 3:03 PM, Theodore Y. Ts'o wrote:
> On Thu, Apr 26, 2018 at 10:28:13AM -0600, Jens Axboe wrote:
>> during boot. We end up doing the numa_crng_init() from interrupt context, which
>> makes things unhappy since you do GFP_KERNEL | __GFP_NOFAIL allocations from
>> there.
> I've already sent a pull request to Linux to fix this; see the
> random.git tree.
> Apologies for not noticing this earlier. My test environment had
> virtio-rng enabled by default, and while I did test the CONFIG_NUMA
> case, the call to add randomness doesn't happen from interrupt context
> with virtio-rng so I missed it in my testing.

OK, all good, just wanted to ensure it was known.

Jens Axboe