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create-diff-object: ignore __patchable_function_entries

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Kernel v6.2+ commit bea75b33895f ("x86/Kconfig: Introduce function
padding") introduces the -fpatchable-function-entry=16,16 build flag on
x86.  This leverages compiler support for generating a
__patchable_function_entries section similar to __mcount_loc.

That said, x86 still utilizes __mcount_loc even when
__patchable_function_entries exists.  The latter point to the __pfx
symbols, but the section is discarded in the vmlinux link and isn't used
regardless, for ftrace or for any other purpose.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
This commit is contained in:
Joe Lawrence 2023-02-10 13:38:05 -05:00 committed by Josh Poimboeuf
parent 6b78bd5c67
commit 7d22fefa35
1 changed files with 6 additions and 0 deletions
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6
kpatch-build/create-diff-object.c
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@ -2835,6 +2835,12 @@ static void kpatch_mark_ignored_sections(struct kpatch_elf *kelf)
!strncmp(sec->name, ".llvm_addrsig", 13) ||
!strncmp(sec->name, ".llvm.", 6))
sec->ignore = 1;
if (kelf->arch == X86_64) {
if (!strcmp(sec->name, ".rela__patchable_function_entries") ||
!strcmp(sec->name, "__patchable_function_entries"))
sec->ignore = 1;
}
}
sec = find_section_by_name(&kelf->sections, ".kpatch.ignore.sections");