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Fri, 23 Apr 2021 14:53:36 +0000 (UTC) Subject: Re: [PATCH 3/6] mm/page_owner: Constify dump_page_owner To: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org References: <20210416231531.2521383-1-willy@infradead.org> <20210416231531.2521383-4-willy@infradead.org> From: Vlastimil Babka Message-ID: Date: Fri, 23 Apr 2021 16:53:36 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 MIME-Version: 1.0 In-Reply-To: <20210416231531.2521383-4-willy@infradead.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 3B26DE000120 X-Stat-Signature: 4iz14qn6zo5gedib8ckknxs1w59fn4hj Received-SPF: none (suse.cz>: No applicable sender policy available) receiver=imf13; identity=mailfrom; envelope-from=""; helo=mx2.suse.de; client-ip=195.135.220.15 X-HE-DKIM-Result: none/none X-HE-Tag: 1619189612-375650 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 4/17/21 1:15 AM, Matthew Wilcox (Oracle) wrote: > dump_page_owner() only uses struct page to find the page_ext, and > lookup_page_ext() already takes a const argument. > > Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Vlastimil Babka > --- > include/linux/page_owner.h | 6 +++--- > mm/page_owner.c | 2 +- > 2 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/include/linux/page_owner.h b/include/linux/page_owner.h > index 3468794f83d2..719bfe5108c5 100644 > --- a/include/linux/page_owner.h > +++ b/include/linux/page_owner.h > @@ -14,7 +14,7 @@ extern void __set_page_owner(struct page *page, > extern void __split_page_owner(struct page *page, unsigned int nr); > extern void __copy_page_owner(struct page *oldpage, struct page *newpage); > extern void __set_page_owner_migrate_reason(struct page *page, int reason); > -extern void __dump_page_owner(struct page *page); > +extern void __dump_page_owner(const struct page *page); > extern void pagetypeinfo_showmixedcount_print(struct seq_file *m, > pg_data_t *pgdat, struct zone *zone); > > @@ -46,7 +46,7 @@ static inline void set_page_owner_migrate_reason(struct page *page, int reason) > if (static_branch_unlikely(&page_owner_inited)) > __set_page_owner_migrate_reason(page, reason); > } > -static inline void dump_page_owner(struct page *page) > +static inline void dump_page_owner(const struct page *page) > { > if (static_branch_unlikely(&page_owner_inited)) > __dump_page_owner(page); > @@ -69,7 +69,7 @@ static inline void copy_page_owner(struct page *oldpage, struct page *newpage) > static inline void set_page_owner_migrate_reason(struct page *page, int reason) > { > } > -static inline void dump_page_owner(struct page *page) > +static inline void dump_page_owner(const struct page *page) > { > } > #endif /* CONFIG_PAGE_OWNER */ > diff --git a/mm/page_owner.c b/mm/page_owner.c > index adfabb560eb9..f51a57e92aa3 100644 > --- a/mm/page_owner.c > +++ b/mm/page_owner.c > @@ -392,7 +392,7 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn, > return -ENOMEM; > } > > -void __dump_page_owner(struct page *page) > +void __dump_page_owner(const struct page *page) > { > struct page_ext *page_ext = lookup_page_ext(page); > struct page_owner *page_owner; >