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Andrii Nakryiko 4c59e584d1 libbpf: Add x86-specific USDT arg spec parsing logic
Add x86/x86_64-specific USDT argument specification parsing. Each
architecture will require their own logic, as all this is arch-specific
assembly-based notation. Architectures that libbpf doesn't support for
USDTs will pr_warn() with specific error and return -ENOTSUP.

We use sscanf() as a very powerful and easy to use string parser. Those
spaces in sscanf's format string mean "skip any whitespaces", which is
pretty nifty (and somewhat little known) feature.

All this was tested on little-endian architecture, so bit shifts are
probably off on big-endian, which our CI will hopefully prove.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/bpf/20220404234202.331384-6-andrii@kernel.org
2022-04-05 13:16:08 -07:00
arch bpf, arm64: Adjust the offset of str/ldr(immediate) to positive number 2022-04-01 00:27:34 +02:00
block ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
certs KEYS: Introduce link restriction for machine keys 2022-03-08 13:55:52 +02:00
crypto for-5.18/64bit-pi-2022-03-25 2022-03-26 12:01:35 -07:00
Documentation Networking fixes for 5.18-rc1 and rethook patches. 2022-03-31 11:23:31 -07:00
drivers Networking fixes for 5.18-rc1 and rethook patches. 2022-03-31 11:23:31 -07:00
fs fs: fix fd table size alignment properly 2022-03-29 23:29:18 -07:00
include bpf: Correct the comment for BTF kind bitfield 2022-04-03 17:06:52 -07:00
init Merge branch 'akpm' (patches from Andrew) 2022-03-24 14:14:07 -07:00
ipc fs: allocate inode by using alloc_inode_sb() 2022-03-22 15:57:03 -07:00
kernel bpf: Replace usage of supported with dedicated list iterator variable 2022-04-03 16:33:36 -07:00
lib bpf, tests: Add load store test case for tail call 2022-04-01 00:27:52 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: page_alloc: validate buddy before check its migratetype. 2022-03-30 15:45:43 -07:00
net Networking fixes for 5.18-rc1 and rethook patches. 2022-03-31 11:23:31 -07:00
samples samples: bpf: Fix linking xdp_router_ipv4 after migration 2022-04-04 14:45:06 -07:00
scripts Driver core changes for 5.18-rc1 2022-03-28 12:41:28 -07:00
security ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
sound xen: branch for v5.18-rc1 2022-03-28 14:32:39 -07:00
tools libbpf: Add x86-specific USDT arg spec parsing logic 2022-04-05 13:16:08 -07:00
usr reiserfs_xattr.h: add linux/reiserfs_xattr.h to UAPI compile-test coverage 2022-02-17 09:09:38 +01:00
virt KVM: compat: riscv: Prevent KVM_COMPAT from being selected 2022-03-11 19:02:15 +05:30
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap Char/Misc and other driver updates for 5.18-rc1 2022-03-28 12:27:35 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Networking fixes for 5.18-rc1 and rethook patches. 2022-03-31 11:23:31 -07:00
Makefile array-bounds updates for v5.18-rc1 2022-03-26 12:30:44 -07:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.