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Thu, 25 Jan 2024 08:42:58 -0800 (PST) From: Alexandru Elisei To: catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, david@redhat.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH RFC v3 03/35] mm: page_alloc: Add an arch hook to filter MIGRATE_CMA allocations Date: Thu, 25 Jan 2024 16:42:24 +0000 Message-Id: <20240125164256.4147-4-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240125164256.4147-1-alexandru.elisei@arm.com> References: <20240125164256.4147-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 6B32C80013 X-Rspam-User: X-Stat-Signature: efr54wjgaaxmsx7xy4fp84z3yn491dbp X-Rspamd-Server: rspam03 X-HE-Tag: 1706200985-869809 X-HE-Meta: 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 ibVxRUbW jw3yRG10QdreTmD+P2Bs9XoBSottaRQnsdBgQ2vP+YFT82fmG1WoTdGcV5q/mExty0iiWTkj9JpKRV7k8MBF1ARIq9hMbfl5GlgkQour+Ka3AJYFHBeufLQkjrhQww4CKH+uD+Ja2QU+NKpkeIvb1L/95yrJHyoFJa9xhdtSSS3PkDBHcapXLdCH2CsPPYsY/UsfFISZsMMJASWc= 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: As an architecture might have specific requirements around the allocation of CMA pages, add an arch hook that can disable allocations from MIGRATE_CMA, if the allocation was otherwise allowed. This will be used by arm64, which will put tag storage pages on the MIGRATE_CMA list, and tag storage pages cannot be tagged. The filter will be used to deny using MIGRATE_CMA for __GFP_TAGGED allocations. Signed-off-by: Alexandru Elisei --- include/linux/pgtable.h | 7 +++++++ mm/page_alloc.c | 3 ++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 6d98d5fdd697..c5ddec6b5305 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -905,6 +905,13 @@ static inline void arch_do_swap_page(struct mm_struct *mm, static inline void arch_free_pages_prepare(struct page *page, int order) { } #endif +#ifndef __HAVE_ARCH_ALLOC_CMA +static inline bool arch_alloc_cma(gfp_t gfp) +{ + return true; +} +#endif + #ifndef __HAVE_ARCH_UNMAP_ONE /* * Some architectures support metadata associated with a page. When a diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 27282a1c82fe..a96d47a6393e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3157,7 +3157,8 @@ static inline unsigned int gfp_to_alloc_flags_cma(gfp_t gfp_mask, unsigned int alloc_flags) { #ifdef CONFIG_CMA - if (gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE) + if (gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE && + arch_alloc_cma(gfp_mask)) alloc_flags |= ALLOC_CMA; #endif return alloc_flags;