In message: [linux-yocto][v5.4/standard/preempt-rt/base][PATCH 1/1] mm: do not
warn for suspend when allocate memory on RT
on 10/04/2020 Liwei Song wrote:
> Interrupts are off during resume from RAM, this will triger a warning
> when allocate memory in non-preemptible context on RT since commit
> 0efa03618228 ("mm: Warn on memory allocation in non-preemptible
> context on RT"), exclude suspend from this warning check.
>
> Fixes: 0efa03618228 ("mm: Warn on memory allocation in non-preemptible
> context on RT")
> Signed-off-by: Liwei Song <[email protected]>
merged
Bruce
> ---
> mm/slub.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/slub.c b/mm/slub.c
> index c3f278fdb7d6..6c8c57a2491b 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2751,7 +2751,7 @@ static __always_inline void *slab_alloc_node(struct
> kmem_cache *s,
> unsigned long tid;
>
> if (IS_ENABLED(CONFIG_PREEMPT_RT) &&
> IS_ENABLED(CONFIG_DEBUG_ATOMIC_SLEEP))
> - WARN_ON_ONCE(!preemptible() && system_state >=
> SYSTEM_SCHEDULING);
> + WARN_ON_ONCE(!preemptible() && system_state >=
> SYSTEM_SCHEDULING && system_state != SYSTEM_SUSPEND);
>
> s = slab_pre_alloc_hook(s, gfpflags);
> if (!s)
> @@ -3216,7 +3216,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t
> flags, size_t size,
> int i;
>
> if (IS_ENABLED(CONFIG_PREEMPT_RT) &&
> IS_ENABLED(CONFIG_DEBUG_ATOMIC_SLEEP))
> - WARN_ON_ONCE(!preemptible() && system_state >=
> SYSTEM_SCHEDULING);
> + WARN_ON_ONCE(!preemptible() && system_state >=
> SYSTEM_SCHEDULING && system_state != SYSTEM_SUSPEND);
>
> /* memcg and kmem_cache debug support */
> s = slab_pre_alloc_hook(s, flags);
> --
> 2.24.1
>
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