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b=LA5VUHH3CQRbq6TtG7uAOUnltv/nWwvN8V4834MNvXbYRxwSmTotOmWteii8UiQS5 QR4fRDprMmPj5OuZI0MppUEPQ57nQvrdsdqpstxXyjI1E00zLmnpLMN9UloL/ZT3FO 0XmliimdrLwMGlqsl+hZIsTW4GKZKZZ9EEBZc2x2c4GzLI/e4yKx5tOAffPk/J5ASP x2ZLdYf9X9nf1oK3mVaEG8OLndn+E+5n+OfO8fLsoGCF3JHWDts5Pv/MKpgYoy/yPr NZso7dD+ZtKvquJLdY3TsryJ/fkqf89H3HUSu6B8WDndLzqUjSBpq32qmt4O6UVQE/ 43dW7Sls5S4Yw== Date: Tue, 1 Sep 2026 20:24:16 +0300 From: Mike Rapoport To: Eli Billauer Cc: Arnd Bergmann , Brad Warrum , Greg Kroah-Hartman , Michal Simek , Ritu Agarwal , Andrew Morton , David Hildenbrand , Matthew Wilcox , Vlastimil Babka , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH 2/4] char: xillybus: replace __get_free_pages() with kmalloc() Message-ID: References: <20260830-char-misc-v1-0-05e2ce44f291@kernel.org> <20260830-char-misc-v1-2-05e2ce44f291@kernel.org> <7adfefaa-91c5-4bf4-ff98-5dfbba0eac96@outbound.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7adfefaa-91c5-4bf4-ff98-5dfbba0eac96@outbound.gmail.com> X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: A868280009 X-Stat-Signature: s5jo48row8mpiyw9odpsg7hzkm7ig11a X-Rspam-User: X-HE-Tag: 1788283466-218864 X-HE-Meta: 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 uUZdyFvy cmJtdnS3zQ5XPUkx0cZLTgiW830bJpHWqYtc0yGtz2MUjv7QqFn0cZ5Gq1tZHDTe3ZNUOKKJRL/EmiIGZ5gB3pYgb0YEFnf1RGTLKgqZc3Z+Yjdn8cmkwwH7+qAFHq2Vakdtw+GjVU13x5/bR1p10geeX4kvJYbNdy5nG6NzOpZcyokL7/T9dfYpbAU7KNRpa81JAcPVc/wZ91NAATfiAHh280c6lFIsOeI3Xba4pErsOFU+M6NdYq19BzGYAOrwEceO8LMp+GsxGp83Xy8SBZQxQ2O+rTnJKo1+HnC8H4P1gfEQWsV6XdhDw84LuCbYOnov2xlOyPL4NIX2Jm9rTN217ZD0uQX0sLUetF2FO0R9xASzhFNTi7TLWnniiZS9U76lcgs749cfBQG01pE+1Op85Cw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Sep 01, 2026 at 10:42:47AM +0200, Eli Billauer wrote: > On 31/08/2026 13:32, Mike Rapoport wrote: > > For large sizes kmalloc falls back to page allocator anyway. > > > > And the doc is out of date unfortunately. > > I think it would be a good idea to update the doc first, and by doing so > officially change the API. After getting this change approved, it's indeed > safe to rely on kmalloc() even for larger memory allocations. The documentation always lags behind the code and "official" API is what include/linux/slab.h says :) When I wrote that document, SLAB and SLOB were still around and had different properties than SLUB for larger allocations. Still, the documentation update is on it's way upstream: https://lore.kernel.org/linux-mm/20260831-docs-memalloc-guide-v1-0-547718c274c1@kernel.org/ > Regards, > Eli -- Sincerely yours, Mike.