Messages in this thread Patch in this message | | | From | Nathan Chancellor <> | Subject | [PATCH v2 1/2] padata: Mark padata_work_init() as __ref | Date | Wed, 7 Dec 2022 12:16:56 -0700 |
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When building arm64 allmodconfig + ThinLTO with clang and a proposed modpost update to account for -ffuncton-sections, the following warning appears:
WARNING: modpost: vmlinux.o: section mismatch in reference: padata_work_init (section: .text.padata_work_init) -> padata_mt_helper (section: .init.text) WARNING: modpost: vmlinux.o: section mismatch in reference: padata_work_init (section: .text.padata_work_init) -> padata_mt_helper (section: .init.text)
LLVM has optimized padata_work_init() to include the address of padata_mt_helper() directly, which causes modpost to complain since padata_work_init() is not __init, whereas padata_mt_helper() is. In reality, padata_work_init() is only called with padata_mt_helper() as the work_fn argument in code that is __init, so this warning will not result in any problems. Silence it with __ref, which makes it clear to modpost that padata_work_init() can only use padata_mt_helper() in __init code.
Suggested-by: Daniel Jordan <daniel.m.jordan@oracle.com> Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: linux-crypto@vger.kernel.org --- kernel/padata.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/padata.c b/kernel/padata.c index e5819bb8bd1d..4c3137fe8449 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -83,8 +83,8 @@ static struct padata_work *padata_work_alloc(void) return pw; } -static void padata_work_init(struct padata_work *pw, work_func_t work_fn, - void *data, int flags) +static __ref void padata_work_init(struct padata_work *pw, work_func_t work_fn, + void *data, int flags) { if (flags & PADATA_WORK_ONSTACK) INIT_WORK_ONSTACK(&pw->pw_work, work_fn); base-commit: 76dcd734eca23168cb008912c0f69ff408905235 -- 2.38.1
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