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Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1uwLp6-0000000ALQM-1DUg; Wed, 10 Sep 2025 14:29:24 +0000 From: "Matthew Wilcox (Oracle)" To: Andrew Morton Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, Zi Yan , David Hildenbrand Subject: [PATCH 1/3] mm: Constify compound_order() and page_size() Date: Wed, 10 Sep 2025 15:29:17 +0100 Message-ID: <20250910142923.2465470-2-willy@infradead.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250910142923.2465470-1-willy@infradead.org> References: <20250910142923.2465470-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 9t78mhspwutoi113swexem1yqgsr1d64 X-Rspam-User: X-Rspamd-Queue-Id: CAC0910000E X-Rspamd-Server: rspam10 X-HE-Tag: 1757514574-583086 X-HE-Meta: U2FsdGVkX18PNoXhIbaurB9bF7Ad+hTD1WRVDw3MWRYfgF4XGMZRZLIuOB4t024ePhDQMs/KX/dAyuXQpBfCWkM7culgtE9NZK+CAK8MK71zQ3UqKfLDBit0zRCmP/5FqS9fzcMYBp0dUC45zml3V/E4ugNiHQVM8/VKgOLek8pcrPSBPJumRBrrA0mSreZkY4yiI7S+uTtH8EhTUBXhlnMjLOyzSm1HTve+cRjEaSRWQ3hMHyfp29yvp8TTpfoWbzNE4w6cPqMlj1FpCOZ5awGnuw4+8Y0iqyG00JoDKs9yON8kQPLTGarP213qIQukPiuQMxPjF1BO7i1IZlSFWh9ChSY+U0v23/+eLYbn9eY6WSMLjRorkHKt28rwugzafP1SyWbrbjDK/yMzjXlNJ0iTkfaOGD2+xh3Gz6a6+g+nIOLPk5b3kDQGhmh5DtJCssQlhPqkT8MdmwlUm91aQf+8d4iXDIwZ6N+YocpZqSNDJx3YSLthsLDtcCmnrPk0X6r+JRDr3iGC19pI+6PP4K4WzhWGBoaJlAL6TlAtZcTW0c5vYv0kT/YTFKz8gExNywzCDisdqBv0vJsl5VjLQjvkNp8NWEtM/BT8CbP9uJYwkfLbPUNtPP9BivnkMRf6dSkNL945eZ5qXa0PI/qksMG4aHJWzVlrV6cbq70Azhxjju+mvL6kINrM4xStbjZFPsbWqSPr/ujokdMyB8mA7Y6CVFyAVtZMopJ+jd7BHOCT8o/kX7cJFjaVokke6bSR+oVeSgDpAwp/vPEPh+3qLWzQOoCWJ4U55v55x68UTEQy5oVVFX9CdtSS/zXyRNviSFZZ0/QNVOUi72QMZuUdE6b4BbiH3u0uCWvh9mWaM+sVEzXC6R1XUMzKsNKL69jD9je5QJuOI0ChBZMUGtJZpdJ/J/KTH7Kyad4M/D4fN11n0NETqbUbvPiKyxQMHVFC1UekgCgYQoB2jakcEoQ MAOLL2j9 tMAXjzpwPxQMPMtuaKq5rV10WKmNUkTc8GQ9/QqGXAfBMVtefXD7WfpWngYHgqda/6nG9xW2RbUDXwWwv5ScCRb02SRSLjdt62M7iRdNbEHCgC97oP2IhE3uAY3RvK0swOMkZu3ZQLf4HvE0MRkCbsYOKbL1Ic4nVtV0i9J9SOyVPuAAHAhzYi4cO65kSEkUb94ihFQPTAxU0tsB9LX52HcdXZyy4hxEfddiut86dzMPbL6B/cmTAmBRFjD5tH+CIE5zSDgIEUNlql2Su5zhrs1DRa33AkXxWaKG802VWrEajMqM4HE1SmtM3vA== 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: List-Subscribe: List-Unsubscribe: These functions do not modify their arguments. Telling the compiler this may improve code generation, and allows us to pass const arguments from other functions. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Zi Yan Acked-by: David Hildenbrand --- include/linux/mm.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 892fe5dbf9de..5ba30a8c6c6d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1036,9 +1036,9 @@ static inline long folio_large_nr_pages(const struct folio *folio) * set before the order is initialised, or this may be a tail page. * See compaction.c for some good examples. */ -static inline unsigned int compound_order(struct page *page) +static inline unsigned int compound_order(const struct page *page) { - struct folio *folio = (struct folio *)page; + const struct folio *folio = (struct folio *)page; if (!test_bit(PG_head, &folio->flags.f)) return 0; @@ -1257,7 +1257,7 @@ int folio_mc_copy(struct folio *dst, struct folio *src); unsigned long nr_free_buffer_pages(void); /* Returns the number of bytes in this potentially compound page. */ -static inline unsigned long page_size(struct page *page) +static inline unsigned long page_size(const struct page *page) { return PAGE_SIZE << compound_order(page); } -- 2.47.2