From: Tim Chen <tim.c.chen@linux.intel.com>
To: Zhen Lei <thunder.leizhen@huawei.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/3] mm/swap: simplify enable_swap_slots_cache()
Date: Fri, 1 May 2020 14:59:57 -0700 [thread overview]
Message-ID: <36a2f775-2f33-2b06-048a-8f82fd288d3b@linux.intel.com> (raw)
In-Reply-To: <20200430061143.450-3-thunder.leizhen@huawei.com>
On 4/29/20 11:11 PM, Zhen Lei wrote:
> Whether swap_slot_cache_initialized is true or false,
> __reenable_swap_slots_cache() is always called. To make this meaning
> clear, leave only one call to __reenable_swap_slots_cache(). This also
> make it clearer what extra needs be done when swap_slot_cache_initialized
> is false.
>
> No functional change.
>
> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Tim Chen <tim.c.chen@linux.intel.com>
> ---
> mm/swap_slots.c | 22 ++++++++++------------
> 1 file changed, 10 insertions(+), 12 deletions(-)
>
> diff --git a/mm/swap_slots.c b/mm/swap_slots.c
> index 01609b5f0c55..b40394473a3c 100644
> --- a/mm/swap_slots.c
> +++ b/mm/swap_slots.c
> @@ -240,21 +240,19 @@ static int free_slot_cache(unsigned int cpu)
>
> int enable_swap_slots_cache(void)
> {
> - int ret = 0;
> -
> mutex_lock(&swap_slots_cache_enable_mutex);
> - if (swap_slot_cache_initialized) {
> - __reenable_swap_slots_cache();
> - goto out_unlock;
> - }
> + if (!swap_slot_cache_initialized) {
> + int ret;
>
> - ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "swap_slots_cache",
> - alloc_swap_slot_cache, free_slot_cache);
> - if (WARN_ONCE(ret < 0, "Cache allocation failed (%s), operating "
> - "without swap slots cache.\n", __func__))
> - goto out_unlock;
> + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "swap_slots_cache",
> + alloc_swap_slot_cache, free_slot_cache);
> + if (WARN_ONCE(ret < 0, "Cache allocation failed (%s), operating "
> + "without swap slots cache.\n", __func__))
> + goto out_unlock;
> +
> + swap_slot_cache_initialized = true;
> + }
>
> - swap_slot_cache_initialized = true;
> __reenable_swap_slots_cache();
> out_unlock:
> mutex_unlock(&swap_slots_cache_enable_mutex);
>
next prev parent reply other threads:[~2020-05-01 22:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 6:11 [PATCH 0/3] clean up some functions in mm/swap_slots.c Zhen Lei
2020-04-30 6:11 ` [PATCH 1/3] mm/swap: simplify alloc_swap_slot_cache() Zhen Lei
2020-05-01 21:46 ` Tim Chen
2020-04-30 6:11 ` [PATCH 2/3] mm/swap: simplify enable_swap_slots_cache() Zhen Lei
2020-05-01 21:59 ` Tim Chen [this message]
2020-04-30 6:11 ` [PATCH 3/3] mm/swap: remove redundant check for swap_slot_cache_initialized Zhen Lei
2020-05-01 22:35 ` Tim Chen
2020-07-08 9:27 ` [PATCH 0/3] clean up some functions in mm/swap_slots.c Leizhen (ThunderTown)
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