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Wong" , mcgrof@kernel.org, gost.dev@samsung.com, kernel@pankajraghav.com, hch@lst.de, Pankaj Raghav Subject: [PATCH 4/5] mm: add largest_zero_folio() routine Date: Mon, 4 Aug 2025 14:13:55 +0200 Message-ID: <20250804121356.572917-5-kernel@pankajraghav.com> In-Reply-To: <20250804121356.572917-1-kernel@pankajraghav.com> References: <20250804121356.572917-1-kernel@pankajraghav.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 2B18BC0002 X-Stat-Signature: 8ecki5i8tsmnbt9riyexno3iuixkgf9q X-Rspam-User: X-HE-Tag: 1754309681-880345 X-HE-Meta: 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 MLTtN7Rc 4WFnZxR21qz2SkWKCjY8Ss6RDWMzhlb/rYCuplvSthwYOjh5DdfyWbfhNpbCmn7iLkJPQ4e0APCWXAGjr6FAhxfJWi4664AZZnVVpi8GuYJpPQuMRxwbsnIGH3lvtIAqRij/M 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: From: Pankaj Raghav Add largest_zero_folio() routine so that huge_zero_folio can be used directly when CONFIG_STATIC_HUGE_ZERO_FOLIO is enabled. This will return ZERO_PAGE folio if CONFIG_STATIC_HUGE_ZERO_FOLIO is disabled or if we failed to allocate a huge_zero_folio. Co-developed-by: David Hildenbrand Signed-off-by: David Hildenbrand Signed-off-by: Pankaj Raghav --- include/linux/huge_mm.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 78ebceb61d0e..c44a6736704b 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -716,4 +716,21 @@ static inline int split_folio_to_order(struct folio *folio, int new_order) return split_folio_to_list_to_order(folio, NULL, new_order); } +/* + * largest_zero_folio - Get the largest zero size folio available + * + * This function will return huge_zero_folio if CONFIG_STATIC_HUGE_ZERO_FOLIO + * is enabled. Otherwise, a ZERO_PAGE folio is returned. + * + * Deduce the size of the folio with folio_size instead of assuming the + * folio size. + */ +static inline struct folio *largest_zero_folio(void) +{ + struct folio *folio = get_static_huge_zero_folio(); + + if (folio) + return folio; + return page_folio(ZERO_PAGE(0)); +} #endif /* _LINUX_HUGE_MM_H */ -- 2.49.0