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+=====================================
+The Linux kernel user-space API guide
+=====================================
+
+.. _man-pages: https://www.kernel.org/doc/man-pages/
+
+While much of the kernel's user-space API is documented elsewhere
+(particularly in the man-pages_ project), some user-space information can
+also be found in the kernel tree itself. This manual is intended to be the
+place where this information is gathered.
+
+
+System calls
+============
+
+.. toctree::
+ :maxdepth: 1
+
+ unshare
+ futex2
+ ebpf/index
+ ioctl/index
+ mseal
+ rseq
+
+Security-related interfaces
+===========================
+
+.. toctree::
+ :maxdepth: 1
+
+ no_new_privs
+ seccomp_filter
+ landlock
+ lsm
+ mfd_noexec
+ spec_ctrl
+ tee
+ check_exec
+
+Devices and I/O
+===============
+
+.. toctree::
+ :maxdepth: 1
+
+ accelerators/ocxl
+ dma-buf-heaps
+ dma-buf-alloc-exchange
+ fwctl/index
+ gpio/index
+ iommufd
+ media/index
+ dcdbas
+ vduse
+ isapnp
+
+Everything else
+===============
+
+.. toctree::
+ :maxdepth: 1
+
+ ELF
+ liveupdate
+ netlink/index
+ sysfs-platform_profile
+ vduse
+ futex2
+ perf_ring_buffer
+ ntsync