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Mon, 13 Jun 2022 03:36:08 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3A5DFA4054; Mon, 13 Jun 2022 03:36:08 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 23162A405B; Mon, 13 Jun 2022 03:36:02 +0000 (GMT) Received: from [9.43.31.74] (unknown [9.43.31.74]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 13 Jun 2022 03:36:01 +0000 (GMT) Message-ID: <9da3c6ef-ba0d-6229-2188-0956222b04f1@linux.ibm.com> Date: Mon, 13 Jun 2022 09:05:59 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH v6 03/13] mm/demotion: Return error on write to numa_demotion sysfs Content-Language: en-US To: Ying Huang , linux-mm@kvack.org, akpm@linux-foundation.org Cc: Wei Xu , Greg Thelen , Yang Shi , Davidlohr Bueso , Tim C Chen , Brice Goglin , Michal Hocko , Linux Kernel Mailing List , Hesham Almatary , Dave Hansen , Jonathan Cameron , Alistair Popple , Dan Williams , Feng Tang , Jagdish Gediya , Baolin Wang , David Rientjes References: <20220610135229.182859-1-aneesh.kumar@linux.ibm.com> <20220610135229.182859-4-aneesh.kumar@linux.ibm.com> <7ed1f9f544937b5c82ab380a4977e5ae22a98c43.camel@intel.com> From: Aneesh Kumar K V In-Reply-To: <7ed1f9f544937b5c82ab380a4977e5ae22a98c43.camel@intel.com> Content-Type: text/plain; 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dkim=pass header.d=ibm.com header.s=pp1 header.b=L40rKrm6; spf=pass (imf11.hostedemail.com: domain of aneesh.kumar@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=aneesh.kumar@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com X-HE-Tag: 1655091386-191071 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/13/22 8:56 AM, Ying Huang wrote: > On Fri, 2022-06-10 at 19:22 +0530, Aneesh Kumar K.V wrote: >> With CONFIG_MIGRATION disabled return EINVAL on write. >> >> Signed-off-by: Aneesh Kumar K.V >> --- >>  mm/memory-tiers.c | 3 +++ >>  1 file changed, 3 insertions(+) >> >> diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c >> index 9c6b40d7e0bf..c3123a457d90 100644 >> --- a/mm/memory-tiers.c >> +++ b/mm/memory-tiers.c >> @@ -105,6 +105,9 @@ static ssize_t numa_demotion_enabled_store(struct kobject *kobj, >>  { >>   ssize_t ret; >> >> >> + if (!IS_ENABLED(CONFIG_MIGRATION)) >> + return -EINVAL; >> + > > How about enclose numa_demotion_enabled_xxx related code with CONFIG_MIGRATION? > IIUC there is a desire to use IS_ENABLED() in the kernel instead of #ifdef since that helps in more compile time checks. Because there are no dead codes during compile now with IS_ENABLED(). W.r.t leaving the sysfs file visible even when CONFIG_MIGRATION is disabled, I was thinking it gives better visibility into numa_demotion status. I could switch to hide numa_demotion file if that is desirable. >>   ret = kstrtobool(buf, &numa_demotion_enabled); >>   if (ret) >>   return ret; > -aneesh