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linux/tools/objtool
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Josh Poimboeuf 4dc5c03fbd objtool: Ignore end-of-section jumps for KCOV/GCOV 
commit 0d7597749f upstream.

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/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-05-02 07:59:33 +02:00
..
arch objtool: Handle frame pointer related instructions 2024-09-17 22:23:09 +08:00
Documentation x86/alternatives, kvm: Fix a couple of CALLs without a frame pointer 2024-07-01 12:41:11 +02:00
include/objtool objtool: Fix C jump table annotations for Clang 2025-03-07 18:25:36 +01:00
.gitignore objtool: Install libsubcmd in build 2023-01-30 16:27:46 -08:00
Build objtool: Install libsubcmd in build 2023-01-30 16:27:46 -08:00
builtin-check.c objtool: Use "action" in error message to be consistent with help 2024-07-02 23:40:24 -07:00
check.c objtool: Ignore end-of-section jumps for KCOV/GCOV 2025-05-02 07:59:33 +02:00
elf.c objtool: Remove max symbol name length limitation 2023-10-05 17:01:28 -07:00
Makefile objtool/LoongArch: Enable orc to be built 2024-03-11 22:23:47 +08:00
noreturns.h objtool: Add bch2_trans_unlocked_error() to bcachefs noreturns 2025-01-02 10:34:21 +01:00
objtool.c objtool: Propagate early errors 2023-10-05 17:01:11 -07:00
orc_dump.c objtool/x86: Separate arch-specific and generic parts 2024-03-11 22:23:47 +08:00
orc_gen.c objtool/x86: Separate arch-specific and generic parts 2024-03-11 22:23:47 +08:00
special.c x86/alternatives: Add nested alternatives macros 2024-06-11 17:13:08 +02:00
sync-check.sh objtool: Add objtool_types.h 2023-03-23 23:18:56 +01:00
weak.c objtool: Ditch subcommands 2022-04-22 12:32:01 +02:00