From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- Documentation/userspace-api/index.rst | 71 +++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 Documentation/userspace-api/index.rst (limited to 'Documentation/userspace-api/index.rst') diff --git a/Documentation/userspace-api/index.rst b/Documentation/userspace-api/index.rst new file mode 100644 index 000000000..a68b1bea5 --- /dev/null +++ b/Documentation/userspace-api/index.rst @@ -0,0 +1,71 @@ +===================================== +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 -- cgit v1.3.1