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Peter Anvin" , Vlastimil Babka , Zi Yan , Dave Hansen , David Hildenbrand , Lorenzo Stoakes , Andrew Morton , "Liam R . Howlett" , Jens Axboe Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org, x86@kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Darrick J . Wong" , mcgrof@kernel.org, gost.dev@samsung.com, kernel@pankajraghav.com, hch@lst.de, Pankaj Raghav Subject: [RFC 3/4] mm: add largest_zero_folio() routine Date: Tue, 22 Jul 2025 11:42:14 +0200 Message-ID: <20250722094215.448132-4-kernel@pankajraghav.com> In-Reply-To: <20250722094215.448132-1-kernel@pankajraghav.com> References: <20250722094215.448132-1-kernel@pankajraghav.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: DF3C0100005 X-Stat-Signature: uzmmp8j4isn59j6mdroujgwk3i9feddr X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1753177381-411256 X-HE-Meta: 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 VKRD8v2/ Dgm1mTubJrsC6HTPD28UwhACZbo9uigLMPfesYY18eeZ2QTYRYfASOADyX6AGqmffPeoPpvmuaSn1C7kPPPwE3BEoFfqWfv5nRQG010kz0DoQfOlvZKx3MmiMOzsIq/AGS/xLtSDXleinjXMToFIwAEEPdxEzGo/rYliNAVkoTnl2ypKjwujeNuC2HOOLWFyS7kKA3fajPPIfdJooPZg5OKRpwN+1FiywujsLluUk2OYdZZHuka7+ggF+BbwYwOWJIi4ch0rAfjnCVhFeIjc/s1sD550mPnxJOWDkBhzJ0kl3hfoOeXx2iBgjAG0w9W1iwRZtyZSQOisuU1PsCpW8ynqc2Sdl69Q9l1qfdrxHbyhNOV6AjEfJH4JpnqL8KVdorPvlC4N6qih1xXo/qqS6KIG3Ow== 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: Pankaj Raghav --- include/linux/huge_mm.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 0ddd9c78f9f4..a34c5427aaf6 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -714,4 +714,12 @@ static inline int split_folio_to_order(struct folio *folio, int new_order) return split_folio_to_list_to_order(folio, NULL, new_order); } +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