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Eder Zulian 5f494f4823 libbpf: Prevent compiler warnings/errors 
commit 7f4ec77f3f upstream.

Initialize 'new_off' and 'pad_bits' to 0 and 'pad_type' to  NULL in
btf_dump_emit_bit_padding to prevent compiler warnings/errors which are
observed when compiling with 'EXTRA_CFLAGS=-g -Og' options, but do not
happen when compiling with current default options.

For example, when compiling libbpf with

  $ make "EXTRA_CFLAGS=-g -Og" -C tools/lib/bpf/ clean all

Clang version 17.0.6 and GCC 13.3.1 fail to compile btf_dump.c due to
following errors:

  btf_dump.c: In function ‘btf_dump_emit_bit_padding’:
  btf_dump.c:903:42: error: ‘new_off’ may be used uninitialized [-Werror=maybe-uninitialized]
    903 |         if (new_off > cur_off && new_off <= next_off) {
        |                                  ~~~~~~~~^~~~~~~~~~~
  btf_dump.c:870:13: note: ‘new_off’ was declared here
    870 |         int new_off, pad_bits, bits, i;
        |             ^~~~~~~
  btf_dump.c:917:25: error: ‘pad_type’ may be used uninitialized [-Werror=maybe-uninitialized]
    917 |                         btf_dump_printf(d, "\n%s%s: %d;", pfx(lvl), pad_type,
        |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    918 |                                         in_bitfield ? new_off - cur_off : 0);
        |                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  btf_dump.c:871:21: note: ‘pad_type’ was declared here
    871 |         const char *pad_type;
        |                     ^~~~~~~~
  btf_dump.c:930:20: error: ‘pad_bits’ may be used uninitialized [-Werror=maybe-uninitialized]
    930 |                 if (bits == pad_bits) {
        |                    ^
  btf_dump.c:870:22: note: ‘pad_bits’ was declared here
    870 |         int new_off, pad_bits, bits, i;
        |                      ^~~~~~~~
  cc1: all warnings being treated as errors

Signed-off-by: Eder Zulian <ezulian@redhat.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20241022172329.3871958-3-ezulian@redhat.com
Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-04-20 10:16:01 +02:00
arch x86/e820: Fix handling of subpage regions when calculating nosave ranges in e820__register_nosave_regions() 2025-04-20 10:16:01 +02:00
block block: fix 'kmem_cache of name 'bio-108' already exists' 2025-03-22 12:54:21 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: api - Fix larval relookup type and mask 2025-04-10 14:39:20 +02:00
Documentation dt-bindings: coresight: qcom,coresight-tpdm: Fix too many 'reg' 2025-04-20 10:15:53 +02:00
drivers ACPI: platform-profile: Fix CFI violation when accessing sysfs files 2025-04-20 10:16:00 +02:00
fs nfsd: don't ignore the return code of svc_proc_register() 2025-04-20 10:16:01 +02:00
include landlock: Add the errata interface 2025-04-20 10:15:55 +02:00
init ARM: 9443/1: Require linker to support KEEP within OVERLAY for DCE 2025-04-10 14:39:40 +02:00
io_uring io_uring/kbuf: reject zero sized provided buffers 2025-04-20 10:15:40 +02:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel sched_ext: create_dsq: Return -EEXIST on duplicate request 2025-04-20 10:15:59 +02:00
lib lib: scatterlist: fix sg_split_phys to preserve original scatterlist offsets 2025-04-20 10:15:45 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper 2025-04-20 10:15:50 +02:00
net sctp: detect and prevent references to a freed transport in sendmsg 2025-04-20 10:15:50 +02:00
rust rust: Fix enabling Rust and building with GCC for LoongArch 2025-04-10 14:39:36 +02:00
samples rust: treewide: switch to the kernel Vec type 2025-03-13 13:01:46 +01:00
scripts kbuild: exclude .rodata.(cst|str)* when building ranges 2025-04-20 10:15:44 +02:00
security landlock: Prepare to add second errata 2025-04-20 10:15:56 +02:00
sound ALSA: hda/realtek: Enable Mute LED on HP OMEN 16 Laptop xd000xx 2025-04-20 10:15:42 +02:00
tools libbpf: Prevent compiler warnings/errors 2025-04-20 10:16:01 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow building irqbypass.ko as as module when kvm.ko is a module 2025-04-20 10:15:54 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: enable Clippy's check-private-items 2025-03-13 13:01:42 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add entry for the Rust alloc module 2025-03-13 13:01:47 +01:00
Makefile Linux 6.12.23 2025-04-10 14:39:41 +02:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.