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Josh Poimboeuf 0d7597749f objtool: Ignore end-of-section jumps for KCOV/GCOV 
When KCOV or GCOV is enabled, dead code can be left behind, in which
case objtool silences unreachable and undefined behavior (fallthrough)
warnings.

Fallthrough warnings, and their variant "end of section" warnings, were
silenced with the following commit:

  6b023c7842 ("objtool: Silence more KCOV warnings")

Another variant of a fallthrough warning is a jump to the end of a
function.  If that function happens to be at the end of a section, the
jump destination doesn't actually exist.

Normally that would be a fatal objtool error, but for KCOV/GCOV it's
just another undefined behavior fallthrough.  Silence it like the
others.

Fixes the following warning:

  drivers/iommu/dma-iommu.o: warning: objtool: iommu_dma_sw_msi+0x92: can't find jump dest instruction at .text+0x54d5

Fixes: 6b023c7842 ("objtool: Silence more KCOV warnings")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/08fbe7d7e1e20612206f1df253077b94f178d93e.1743481539.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/314f8809-cd59-479b-97d7-49356bf1c8d1@infradead.org/
2025-04-01 09:07:12 +02:00
arch objtool: Fix X86_FEATURE_SMAP alternative handling 2025-03-25 09:20:26 +01:00
block cgroup: Changes for v6.15 2025-03-24 16:49:40 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
Documentation x86/build updates for v6.15: 2025-03-24 22:23:23 -07:00
drivers objtool, drm/vmwgfx: Don't ignore vmw_send_msg() for ORC 2025-03-28 14:47:02 +01:00
fs Scheduler updates for v6.15: 2025-03-24 21:28:12 -07:00
include objtool: Fix up some outdated references to ENTRY/ENDPROC 2025-03-25 09:20:27 +01:00
init [ Merge note: this pull request depends on you having merged 2025-03-24 22:06:11 -07:00
io_uring io_uring-6.14-20250322 2025-03-22 10:45:44 -07:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel objtool, panic: Disable SMAP in __stack_chk_fail() 2025-03-25 23:00:15 +01:00
lib [ Merge note: this pull request depends on you having merged 2025-03-24 22:06:11 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm [ Merge note: this pull request depends on you having merged 2025-03-24 22:06:11 -07:00
net vfs-6.15-rc1.afs 2025-03-24 13:15:16 -07:00
rust Locking changes for v6.15: 2025-03-24 20:55:03 -07:00
samples hardening updates for v6.15-rc1 2025-03-24 15:18:08 -07:00
scripts objtool: Silence more KCOV warnings, part 2 2025-04-01 09:07:12 +02:00
security hardening updates for v6.15-rc1 2025-03-24 15:18:08 -07:00
sound objtool, ASoC: codecs: wcd934x: Remove potential undefined behavior in wcd934x_slim_irq_handler() 2025-03-25 23:00:16 +01:00
tools objtool: Ignore end-of-section jumps for KCOV/GCOV 2025-04-01 09:07:12 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-05 04:06:45 +09:00
virt vfs-6.15-rc1.misc 2025-03-24 09:13:50 -07:00
.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: give Clippy the minimum supported Rust version 2025-01-10 00:17:25 +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 MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: use host dylib naming convention to support macOS 2025-01-10 01:01:24 +01:00
.mailmap platform-drivers-x86 for v6.14-5 2025-03-14 10:57:28 -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 MAINTAINERS: Move Pavel to kernel.org address 2025-02-07 09:12:33 -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 bitmap changes for 6.15 2025-03-24 19:11:58 -07:00
Makefile [ Merge note: this pull request depends on you having merged 2025-03-24 22:06:11 -07:00
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.