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Thu, 13 Nov 2025 13:56:39 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 7xjSBZfjFWloAwAAD6G6ig (envelope-from ); Thu, 13 Nov 2025 13:56:39 +0000 Date: Thu, 13 Nov 2025 14:56:36 +0100 From: Jean Delvare To: linux-mm@kvack.org Cc: LKML , David Hildenbrand Subject: [PATCH] mm/cma: Remove CONFIG_CMA_SYSFS option Message-ID: <20251113145636.731a24e4@endymion> Organization: SUSE Linux X-Mailer: Claws Mail 4.2.0 (GTK 3.24.43; x86_64-suse-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: X-Spamd-Result: default: False [-3.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.998]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; HAS_ORG_HEADER(0.00)[]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; URIBL_BLOCKED(0.00)[suse.de:email,lkml.org:url,imap1.dmz-prg2.suse.org:helo]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:email] X-Spam-Flag: NO X-Spam-Score: -3.80 Content-Type: text/plain; charset="utf-8" The sysfs interface to CMA has a marginal runtime cost and a small footprint, there's no reason not to include it in all kernels where the dependencies are satisfied. Signed-off-by: Jean Delvare Acked-by: David Hildenbrand (Red Hat) Acked-by: Oscar Salvador Reviewed-by: SeongJae Park --- As discussed with David: https://lkml.org/lkml/2025/8/6/371 arch/loongarch/configs/loongson3_defconfig | 1 - arch/s390/configs/debug_defconfig | 1 - arch/s390/configs/defconfig | 1 - mm/Kconfig | 7 ------- mm/Makefile | 4 +++- mm/cma.h | 4 ++-- 6 files changed, 5 insertions(+), 13 deletions(-) --- linux-6.17.orig/arch/loongarch/configs/loongson3_defconfig +++ linux-6.17/arch/loongarch/configs/loongson3_defconfig @@ -120,7 +120,6 @@ CONFIG_MEMORY_HOTREMOVE=3Dy CONFIG_KSM=3Dy CONFIG_TRANSPARENT_HUGEPAGE=3Dy CONFIG_CMA=3Dy -CONFIG_CMA_SYSFS=3Dy CONFIG_USERFAULTFD=3Dy CONFIG_NET=3Dy CONFIG_PACKET=3Dy --- linux-6.17.orig/arch/s390/configs/debug_defconfig +++ linux-6.17/arch/s390/configs/debug_defconfig @@ -103,7 +103,6 @@ CONFIG_MEMORY_HOTREMOVE=3Dy CONFIG_KSM=3Dy CONFIG_TRANSPARENT_HUGEPAGE=3Dy CONFIG_CMA_DEBUGFS=3Dy -CONFIG_CMA_SYSFS=3Dy CONFIG_CMA_AREAS=3D7 CONFIG_MEM_SOFT_DIRTY=3Dy CONFIG_DEFERRED_STRUCT_PAGE_INIT=3Dy --- linux-6.17.orig/arch/s390/configs/defconfig +++ linux-6.17/arch/s390/configs/defconfig @@ -95,7 +95,6 @@ CONFIG_MEMORY_HOTPLUG=3Dy CONFIG_MEMORY_HOTREMOVE=3Dy CONFIG_KSM=3Dy CONFIG_TRANSPARENT_HUGEPAGE=3Dy -CONFIG_CMA_SYSFS=3Dy CONFIG_CMA_AREAS=3D7 CONFIG_MEM_SOFT_DIRTY=3Dy CONFIG_DEFERRED_STRUCT_PAGE_INIT=3Dy --- linux-6.17.orig/mm/Makefile +++ linux-6.17/mm/Makefile @@ -119,6 +119,9 @@ obj-$(CONFIG_ZPOOL) +=3D zpool.o obj-$(CONFIG_ZSMALLOC) +=3D zsmalloc.o obj-$(CONFIG_GENERIC_EARLY_IOREMAP) +=3D early_ioremap.o obj-$(CONFIG_CMA) +=3D cma.o +ifdef CONFIG_SYSFS +obj-$(CONFIG_CMA) +=3D cma_sysfs.o +endif obj-$(CONFIG_NUMA) +=3D numa.o obj-$(CONFIG_NUMA_MEMBLKS) +=3D numa_memblks.o obj-$(CONFIG_NUMA_EMU) +=3D numa_emulation.o @@ -127,7 +130,6 @@ obj-$(CONFIG_PAGE_EXTENSION) +=3D page_ext obj-$(CONFIG_PAGE_TABLE_CHECK) +=3D page_table_check.o obj-$(CONFIG_CMA_DEBUGFS) +=3D cma_debug.o obj-$(CONFIG_SECRETMEM) +=3D secretmem.o -obj-$(CONFIG_CMA_SYSFS) +=3D cma_sysfs.o obj-$(CONFIG_USERFAULTFD) +=3D userfaultfd.o obj-$(CONFIG_IDLE_PAGE_TRACKING) +=3D page_idle.o obj-$(CONFIG_DEBUG_PAGEALLOC) +=3D debug_page_alloc.o --- linux-6.17.orig/mm/cma.h +++ linux-6.17/mm/cma.h @@ -49,7 +49,7 @@ struct cma { char name[CMA_MAX_NAME]; int nranges; struct cma_memrange ranges[CMA_MAX_RANGES]; -#ifdef CONFIG_CMA_SYSFS +#ifdef CONFIG_SYSFS /* the number of CMA page successful allocations */ atomic64_t nr_pages_succeeded; /* the number of CMA page allocation failures */ @@ -80,7 +80,7 @@ static inline unsigned long cma_bitmap_m return cmr->count >> cma->order_per_bit; } =20 -#ifdef CONFIG_CMA_SYSFS +#ifdef CONFIG_SYSFS void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pag= es); void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages); void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pag= es); --- linux-6.17.orig/mm/Kconfig +++ linux-6.17/mm/Kconfig @@ -981,13 +981,6 @@ config CMA_DEBUGFS help Turns on the DebugFS interface for CMA. =20 -config CMA_SYSFS - bool "CMA information through sysfs interface" - depends on CMA && SYSFS - help - This option exposes some sysfs attributes to get information - from CMA. - config CMA_AREAS int "Maximum count of the CMA areas" depends on CMA --=20 Jean Delvare SUSE L3 Support