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Tiezhu Yang 69b3f5cd6e objtool: Check local label in read_unwind_hints()
commit e91c5e4c21b0339376ee124cda5c9b27d41f2cbc upstream.

When update the latest upstream gcc and binutils, it generates some
objtool warnings on LoongArch, like this:

  arch/loongarch/kernel/entry.o: warning: objtool: ret_from_fork+0x0: unreachable instruction

We can see that the reloc sym name is local label instead of section
in relocation section '.rela.discard.unwind_hints', in this case, the
reloc sym type is STT_NOTYPE instead of STT_SECTION. Let us check it
to not return -1, then use reloc->sym->offset instead of reloc addend
which is 0 to find the corresponding instruction.

Here are some detailed info:
[fedora@linux 6.8.test]$ gcc --version
gcc (GCC) 14.0.1 20240129 (experimental)
[fedora@linux 6.8.test]$ as --version
GNU assembler (GNU Binutils) 2.42.50.20240129
[fedora@linux 6.8.test]$ readelf -r arch/loongarch/kernel/entry.o | grep -A 3 "rela.discard.unwind_hints"
Relocation section '.rela.discard.unwind_hints' at offset 0x3a8 contains 7 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
000000000000  000a00000063 R_LARCH_32_PCREL  0000000000000000 .Lhere_1 + 0
00000000000c  000b00000063 R_LARCH_32_PCREL  00000000000000a8 .Lhere_50 + 0

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2024-11-12 16:59:46 +08:00
Documentation LoongArch: KVM: Add PV steal time support in guest side 2024-11-06 19:36:38 +08:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
arch LoongArch: add iommu support 2024-11-06 19:40:31 +08:00
block rue/io: fix child blkcg of hier buffered write can not exceed 2MB 2024-10-23 14:12:52 +08:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: jitter - set default OSR to 3 2024-10-16 16:00:24 +08:00
dist Merge branch 'haisu/master-tryrue-20240905-merge-honglin' into 'master' (merge request !197) 2024-09-29 01:56:56 +00:00
drivers LoongArch: add iommu support 2024-11-06 19:40:31 +08:00
fs Merge linux 6.6.57 2024-10-21 14:40:59 +08:00
include LoongArch: KVM: Add PCHPIC device support 2024-11-06 19:36:37 +08:00
init Merge linux 6.6.48 2024-09-29 16:01:50 +08:00
io_uring io_uring: check if we need to reschedule during overflow flush 2024-10-17 15:24:18 +02:00
ipc sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table) 2024-08-11 12:47:13 +02:00
kernel crashkernel: auto adjust crashkernel min size to 800MB for KASAN 2024-10-22 20:09:22 +08:00
lib Merge linux 6.6.57 2024-10-21 14:40:59 +08:00
mm Merge linux 6.6.57 2024-10-21 14:40:59 +08:00
net Merge linux 6.6.57 2024-10-21 14:40:59 +08:00
rust rust: sync: require `T: Sync` for `LockedBy::access` 2024-10-10 11:57:44 +02:00
samples samples/bpf: Fix compilation errors with cf-protection option 2024-10-04 16:29:19 +02:00
scripts Merge linux 6.6.55 2024-10-11 18:06:09 +08:00
security Merge linux 6.6.55 2024-10-11 18:06:09 +08:00
sound Merge linux 6.6.57 2024-10-21 14:40:59 +08:00
tools objtool: Check local label in read_unwind_hints() 2024-11-12 16:59:46 +08:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Discard zero mask with function kvm_dirty_ring_reset 2024-11-06 19:36:39 +08:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes dist: initial support 2023-12-12 15:56:34 +08:00
.gitignore Merge branch '6.6.54' 2024-10-10 21:47:18 +08:00
.gitmodules drivers/thirdparty: put release-drivers in tree 2024-08-27 17:10:54 +08:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.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 USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kconfig: Fix duplicate "Tencent Kernel Features" menu config 2024-06-24 20:23:33 +08:00
MAINTAINERS LoongArch: KVM: Add KVM hypercalls documentation for LoongArch 2024-11-06 19:36:40 +08:00
Makefile Merge linux 6.6.57 2024-10-21 14:40:59 +08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00
config-readme Makefile, dist: add "make tencentconfig" support 2024-03-04 13:25:26 +08:00

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.