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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) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: E5E7F2000B X-Stat-Signature: crf4ie7zz4npg93e6y5d6ak5yyqfrizr X-HE-Tag: 1763042200-983169 X-HE-Meta: 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 SNIIsTVJ 40q6jxwGcy0UdSf3OE48MUHTWousgwOSPdDBLtKMqzXD8dfq2yJMK2xMlOtfui512Frq3dVhsJpyD61LAMRn0TnNRTfY8qSs7knQ8f/Ma6Oa3G741eM+jku/jojocyZMkjIOm2hMMqHe/vUio3EKHWNwVEvYqRSYtXnKbH/lddMKxc9SwR0wWSAsQZOQZZWSf8HxVHxFK+MLebWOZ8Xi9oxzCt/wfQ8O/ugcNeqB8WGd9KOPj6d/2KERArewcsrK5UWvYEime4QjgBZEwmgp17E/ThrHtPcVr9qX1B1Uos7MF9PbQ2XLQ3NKOWsYMu4IUFsXWB5z5eLlPY9G5jibm9zqYRNgiriCEtwwxriK466UqJu3lnsJqM83cBpkJVmh8TjoUq66mC1PaCT4JKFKmJUGR+G6roLC5pG/T 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: 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 --- 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=y CONFIG_KSM=y CONFIG_TRANSPARENT_HUGEPAGE=y CONFIG_CMA=y -CONFIG_CMA_SYSFS=y CONFIG_USERFAULTFD=y CONFIG_NET=y CONFIG_PACKET=y --- linux-6.17.orig/arch/s390/configs/debug_defconfig +++ linux-6.17/arch/s390/configs/debug_defconfig @@ -103,7 +103,6 @@ CONFIG_MEMORY_HOTREMOVE=y CONFIG_KSM=y CONFIG_TRANSPARENT_HUGEPAGE=y CONFIG_CMA_DEBUGFS=y -CONFIG_CMA_SYSFS=y CONFIG_CMA_AREAS=7 CONFIG_MEM_SOFT_DIRTY=y CONFIG_DEFERRED_STRUCT_PAGE_INIT=y --- linux-6.17.orig/arch/s390/configs/defconfig +++ linux-6.17/arch/s390/configs/defconfig @@ -95,7 +95,6 @@ CONFIG_MEMORY_HOTPLUG=y CONFIG_MEMORY_HOTREMOVE=y CONFIG_KSM=y CONFIG_TRANSPARENT_HUGEPAGE=y -CONFIG_CMA_SYSFS=y CONFIG_CMA_AREAS=7 CONFIG_MEM_SOFT_DIRTY=y CONFIG_DEFERRED_STRUCT_PAGE_INIT=y --- linux-6.17.orig/mm/Makefile +++ linux-6.17/mm/Makefile @@ -119,6 +119,9 @@ obj-$(CONFIG_ZPOOL) += zpool.o obj-$(CONFIG_ZSMALLOC) += zsmalloc.o obj-$(CONFIG_GENERIC_EARLY_IOREMAP) += early_ioremap.o obj-$(CONFIG_CMA) += cma.o +ifdef CONFIG_SYSFS +obj-$(CONFIG_CMA) += cma_sysfs.o +endif obj-$(CONFIG_NUMA) += numa.o obj-$(CONFIG_NUMA_MEMBLKS) += numa_memblks.o obj-$(CONFIG_NUMA_EMU) += numa_emulation.o @@ -127,7 +130,6 @@ obj-$(CONFIG_PAGE_EXTENSION) += page_ext obj-$(CONFIG_PAGE_TABLE_CHECK) += page_table_check.o obj-$(CONFIG_CMA_DEBUGFS) += cma_debug.o obj-$(CONFIG_SECRETMEM) += secretmem.o -obj-$(CONFIG_CMA_SYSFS) += cma_sysfs.o obj-$(CONFIG_USERFAULTFD) += userfaultfd.o obj-$(CONFIG_IDLE_PAGE_TRACKING) += page_idle.o obj-$(CONFIG_DEBUG_PAGEALLOC) += 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; } -#ifdef CONFIG_CMA_SYSFS +#ifdef CONFIG_SYSFS void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages); 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_pages); --- 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. -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 -- Jean Delvare SUSE L3 Support