From: Michal Hocko <mhocko@kernel.org>
To: Yang Shi <yang.s@alibaba-inc.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: use in_atomic() in print_vma_addr()
Date: Thu, 2 Nov 2017 08:57:44 +0100 [thread overview]
Message-ID: <20171102075744.whhxjmqbdkfaxghd@dhcp22.suse.cz> (raw)
In-Reply-To: <1509572313-102989-1-git-send-email-yang.s@alibaba-inc.com>
On Thu 02-11-17 05:38:33, Yang Shi wrote:
> commit 3e51f3c4004c9b01f66da03214a3e206f5ed627b
> ("sched/preempt: Remove PREEMPT_ACTIVE unmasking off in_atomic()") makes
> in_atomic() just check the preempt count, so it is not necessary to use
> preempt_count() in print_vma_addr() any more. Replace preempt_count() to
> in_atomic() which is a generic API for checking atomic context.
But why? Is there some general work to get rid of the direct preempt_count
usage outside of the generic API?
> Signed-off-by: Yang Shi <yang.s@alibaba-inc.com>
> ---
> mm/memory.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/memory.c b/mm/memory.c
> index a728bed..19b684e 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4460,7 +4460,7 @@ void print_vma_addr(char *prefix, unsigned long ip)
> * Do not print if we are in atomic
> * contexts (in exception stacks, etc.):
> */
> - if (preempt_count())
> + if (in_atomic())
> return;
>
> down_read(&mm->mmap_sem);
> --
> 1.8.3.1
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2017-11-02 7:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-01 21:38 [PATCH] mm: use in_atomic() in print_vma_addr() Yang Shi
2017-11-02 7:57 ` Michal Hocko [this message]
2017-11-02 17:44 ` Yang Shi
2017-11-03 8:29 ` Michal Hocko
2017-11-03 18:02 ` Andrew Morton
2017-11-03 18:16 ` Yang Shi
2017-11-03 20:09 ` Bart Van Assche
2017-11-05 8:19 ` Michal Hocko
2017-11-06 10:05 ` Peter Zijlstra
2017-11-06 10:43 ` Michal Hocko
2017-11-06 10:56 ` Michal Hocko
2017-11-06 12:00 ` Peter Zijlstra
2017-11-06 12:12 ` Michal Hocko
2017-11-06 13:40 ` [PATCH] mm: do not rely on preempt_count in print_vma_addr (was: Re: [PATCH] mm: use in_atomic() in print_vma_addr()) Michal Hocko
2017-11-06 14:19 ` [PATCH] mm: do not rely on preempt_count in print_vma_addr Vlastimil Babka
2017-11-06 14:28 ` Michal Hocko
2017-11-06 16:16 ` Yang Shi
2017-11-06 16:24 ` Michal Hocko
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