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Tue, 03 Feb 2026 18:28:36 -0800 (PST) Received: by ikb-h07-29-noble.in.iijlab.net (Postfix, from userid 1010) id 8BE061200C49; Wed, 4 Feb 2026 11:28:35 +0900 (JST) From: Hajime Tazaki To: linux-um@lists.infradead.org Cc: thehajime@gmail.com, ricarkol@google.com, Liam.Howlett@oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH v14 13/13] um: nommu: plug nommu code into build system Date: Wed, 4 Feb 2026 11:28:11 +0900 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: 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 Content-Type: text/plain; charset="utf-8" Add nommu kernel for um build. defconfig is also provided. Signed-off-by: Hajime Tazaki Signed-off-by: Ricardo Koller --- arch/um/Kconfig | 14 ++++++- arch/um/configs/x86_64_nommu_defconfig | 54 ++++++++++++++++++++++++++ 2 files changed, 66 insertions(+), 2 deletions(-) create mode 100644 arch/um/configs/x86_64_nommu_defconfig diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 8415d39b0d43..1c90e3efef2e 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -35,16 +35,19 @@ config UML select ARCH_SUPPORTS_LTO_CLANG_THIN select TRACE_IRQFLAGS_SUPPORT select TTY # Needed for line.c - select HAVE_ARCH_VMAP_STACK + select HAVE_ARCH_VMAP_STACK if MMU select HAVE_RUST select ARCH_HAS_UBSAN select HAVE_ARCH_TRACEHOOK select HAVE_SYSCALL_TRACEPOINTS select THREAD_INFO_IN_TASK select SPARSE_IRQ + select UACCESS_MEMCPY if !MMU + select GENERIC_STRNLEN_USER if !MMU + select GENERIC_STRNCPY_FROM_USER if !MMU =20 config MMU - bool + bool "MMU-based Paged Memory Management Support" if 64BIT default y =20 config UML_DMA_EMULATION @@ -226,8 +229,15 @@ config MAGIC_SYSRQ The keys are documented in . = Don't say Y unless you really know what this hack does. =20 +config ARCH_FORCE_MAX_ORDER + int "Order of maximal physically contiguous allocations" if EXPERT + default "10" if MMU + default "16" if !MMU + config KERNEL_STACK_ORDER int "Kernel stack size order" + default 3 if !MMU + range 3 10 if !MMU default 2 if 64BIT range 2 10 if 64BIT default 1 if !64BIT diff --git a/arch/um/configs/x86_64_nommu_defconfig b/arch/um/configs/x86_6= 4_nommu_defconfig new file mode 100644 index 000000000000..02cb87091c9f --- /dev/null +++ b/arch/um/configs/x86_64_nommu_defconfig @@ -0,0 +1,54 @@ +CONFIG_SYSVIPC=3Dy +CONFIG_POSIX_MQUEUE=3Dy +CONFIG_NO_HZ=3Dy +CONFIG_HIGH_RES_TIMERS=3Dy +CONFIG_BSD_PROCESS_ACCT=3Dy +CONFIG_IKCONFIG=3Dy +CONFIG_IKCONFIG_PROC=3Dy +CONFIG_LOG_BUF_SHIFT=3D14 +CONFIG_CGROUPS=3Dy +CONFIG_BLK_CGROUP=3Dy +CONFIG_CGROUP_SCHED=3Dy +CONFIG_CGROUP_DEVICE=3Dy +CONFIG_CGROUP_CPUACCT=3Dy +# CONFIG_PID_NS is not set +CONFIG_CC_OPTIMIZE_FOR_SIZE=3Dy +# CONFIG_MMU is not set +CONFIG_HOSTFS=3Dy +CONFIG_MAGIC_SYSRQ=3Dy +CONFIG_SSL=3Dy +CONFIG_NULL_CHAN=3Dy +CONFIG_PORT_CHAN=3Dy +CONFIG_PTY_CHAN=3Dy +CONFIG_TTY_CHAN=3Dy +CONFIG_CON_CHAN=3D"pts" +CONFIG_SSL_CHAN=3D"pts" +CONFIG_MODULES=3Dy +CONFIG_MODULE_UNLOAD=3Dy +CONFIG_IOSCHED_BFQ=3Dm +CONFIG_BINFMT_MISC=3Dm +CONFIG_NET=3Dy +CONFIG_PACKET=3Dy +CONFIG_UNIX=3Dy +CONFIG_INET=3Dy +CONFIG_DEVTMPFS=3Dy +CONFIG_DEVTMPFS_MOUNT=3Dy +CONFIG_BLK_DEV_UBD=3Dy +CONFIG_BLK_DEV_LOOP=3Dm +CONFIG_BLK_DEV_NBD=3Dm +CONFIG_DUMMY=3Dm +CONFIG_TUN=3Dm +CONFIG_PPP=3Dm +CONFIG_SLIP=3Dm +CONFIG_LEGACY_PTY_COUNT=3D32 +CONFIG_UML_RANDOM=3Dy +CONFIG_EXT4_FS=3Dy +CONFIG_QUOTA=3Dy +CONFIG_AUTOFS_FS=3Dm +CONFIG_ISO9660_FS=3Dm +CONFIG_JOLIET=3Dy +CONFIG_NLS=3Dy +CONFIG_DEBUG_KERNEL=3Dy +CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=3Dy +CONFIG_FRAME_WARN=3D1024 +CONFIG_IPV6=3Dy --=20 2.43.0