linux-kernel - Re: [BUG, PATCH] random: sleep in irq context

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Date:   Mon, 23 Apr 2018 18:44:19 +0200 (CEST)
From:   Sebastian Ott <sebott@...ux.ibm.com>
To:     "Theodore Ts'o" <tytso@....edu>
cc:     linux-kernel@...r.kernel.org
Subject: Re: [BUG, PATCH] random: sleep in irq context

On Mon, 23 Apr 2018, Sebastian Ott wrote:
> From 9d29e0c92efaf94277bc178782523283958ae8c8 Mon Sep 17 00:00:00 2001
> From: Sebastian Ott <sebott@...ux.ibm.com>
> Date: Mon, 23 Apr 2018 14:59:20 +0200
> Subject: [PATCH] random: don't sleep during allocations in irq context
> 
> Since numa_crng_init() can be called from irq context let's
> use __GFP_ATOMIC for allocations.
> 
> Fixes: 8ef35c866f88 ("random: set up the NUMA crng instances...")
> Signed-off-by: Sebastian Ott <sebott@...ux.ibm.com>
> ---
>  drivers/char/random.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/char/random.c b/drivers/char/random.c
> index 3cd3aae24d6d..e96ea2bf7241 100644
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -791,14 +791,14 @@ static void crng_initialize(struct crng_state *crng)
>  #ifdef CONFIG_NUMA
>  static void numa_crng_init(void)
>  {
> +	gfp_t gfp_flags = GFP_KERNEL | __GFP_NOFAIL | __GFP_ATOMIC;

I should have removed GFP_KERNEL here...