Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 25 Feb 2019 10:13:30 -0500
From:   Dennis Zhou <dennis@kernel.org>
To:     Peng Fan <peng.fan@nxp.com>
Cc:     "dennis@kernel.org" <dennis@kernel.org>,
        "tj@kernel.org" <tj@kernel.org>, "cl@linux.com" <cl@linux.com>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "van.freenix@gmail.com" <van.freenix@gmail.com>
Subject: Re: [PATCH 1/2] percpu: km: remove SMP check
Message-ID: <20190225151330.GA49611@dennisz-mbp.dhcp.thefacebook.com>
References: <20190224132518.20586-1-peng.fan@nxp.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20190224132518.20586-1-peng.fan@nxp.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Sun, Feb 24, 2019 at 01:13:43PM +0000, Peng Fan wrote:
> percpu-km could only be selected by NEED_PER_CPU_KM which
> depends on !SMP, so CONFIG_SMP will be false when choose percpu-km.
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  mm/percpu-km.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/percpu-km.c b/mm/percpu-km.c
> index 0f643dc2dc65..66e5598be876 100644
> --- a/mm/percpu-km.c
> +++ b/mm/percpu-km.c
> @@ -27,7 +27,7 @@
>   *   chunk size is not aligned.  percpu-km code will whine about it.
>   */
>  
> -#if defined(CONFIG_SMP) && defined(CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK)
> +#if defined(CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK)
>  #error "contiguous percpu allocation is incompatible with paged first chunk"
>  #endif
>  
> -- 
> 2.16.4
> 

Hi,

I think keeping CONFIG_SMP makes this easier to remember dependencies
rather than having to dig into the config. So this is a NACK from me.

Thanks,
Dennis