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Tue, 31 Aug 2021 19:04:48 +0800 (CST) Received: from [10.174.178.75] (10.174.178.75) by dggeme703-chm.china.huawei.com (10.1.199.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.8; Tue, 31 Aug 2021 19:08:42 +0800 Subject: Re: [PATCH 2/6] mm/page_alloc.c: simplify the code by using macro K() To: Oleksandr Natalenko CC: , , , , , , Andrew Morton References: <20210830141051.64090-1-linmiaohe@huawei.com> <20210830141051.64090-3-linmiaohe@huawei.com> <9161665.bUqNH3lxUD@natalenko.name> From: Miaohe Lin Message-ID: <52bbb8f2-db63-8c56-ea49-d982c13ba541@huawei.com> Date: Tue, 31 Aug 2021 19:08:42 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <9161665.bUqNH3lxUD@natalenko.name> Content-Type: text/plain; charset="utf-8" Content-Language: en-US X-Originating-IP: [10.174.178.75] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggeme703-chm.china.huawei.com (10.1.199.99) X-CFilter-Loop: Reflected Authentication-Results: imf12.hostedemail.com; dkim=none; spf=pass (imf12.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com; dmarc=pass (policy=none) header.from=huawei.com X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: D4AEE10000AA X-Stat-Signature: oiuzzous8woztrd119phsyoyriixx3w9 X-HE-Tag: 1630408128-759328 Content-Transfer-Encoding: quoted-printable 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 2021/8/31 16:54, Oleksandr Natalenko wrote: > Hello. >=20 > On pond=C4=9Bl=C3=AD 30. srpna 2021 16:10:47 CEST Miaohe Lin wrote: >> Use helper macro K() to convert the pages to the corresponding size. >> Minor readability improvement. >> >> Signed-off-by: Miaohe Lin >> --- >> mm/page_alloc.c | 12 +++++------- >> 1 file changed, 5 insertions(+), 7 deletions(-) >> >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >> index dbb3338d9287..d3983244f56f 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -8134,8 +8134,7 @@ unsigned long free_reserved_area(void *start, vo= id >> *end, int poison, const char } >> >> if (pages && s) >> - pr_info("Freeing %s memory: %ldK\n", >> - s, pages << (PAGE_SHIFT - 10)); >> + pr_info("Freeing %s memory: %ldK\n", s, K(pages)); >> >> return pages; >> } >> @@ -8180,14 +8179,13 @@ void __init mem_init_print_info(void) >> ", %luK highmem" >> #endif >> ")\n", >> - nr_free_pages() << (PAGE_SHIFT - 10), >> - physpages << (PAGE_SHIFT - 10), >> + K(nr_free_pages()), K(physpages), >> codesize >> 10, datasize >> 10, rosize >> 10, >> (init_data_size + init_code_size) >> 10, bss_size >> 10, >> - (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT=20 > - 10), >> - totalcma_pages << (PAGE_SHIFT - 10) >> + K(physpages - totalram_pages() - totalcma_pages), >> + K(totalcma_pages) >> #ifdef CONFIG_HIGHMEM >> - , totalhigh_pages() << (PAGE_SHIFT - 10) >> + , K(totalhigh_pages()) >> #endif >> ); >> } >=20 > (my concern is not quite within the scope of this submission, but I'll = ask=20 > anyway) >=20 > Given we have this: >=20 > ``` > git grep '#define K(x)' v5.14 > v5.14:drivers/base/node.c:#define K(x) ((x) << (PAGE_SHIFT - 10)) > v5.14:drivers/net/hamradio/scc.c:#define K(x) kiss->x > v5.14:kernel/debug/kdb/kdb_main.c:#define K(x) ((x) << (PAGE_SHIFT - 10= )) > v5.14:mm/backing-dev.c:#define K(x) ((x) << (PAGE_SHIFT - 10)) > v5.14:mm/memcontrol.c:#define K(x) ((x) << (PAGE_SHIFT-10)) > v5.14:mm/oom_kill.c:#define K(x) ((x) << (PAGE_SHIFT-10)) > v5.14:mm/page_alloc.c:#define K(x) ((x) << (PAGE_SHIFT-10)) > ``` >=20 > Shouldn't this macro go to some header file instead to get rid of defin= e=20 > repetitions? Many thanks for figuring this out. I think we should get rid of these rep= etitions too. But I'am not sure where this definition should be. Any suggestion? Thanks= . >=20 > Thanks. >=20