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Merge pull request #323 from spartacus06/ignore-funcs-v2

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add support for manually ignore functions
This commit is contained in:
Josh Poimboeuf 2014-07-23 09:01:55 -05:00
commit 77c8700888
2 changed files with 38 additions and 0 deletions
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11
kmod/patch/kpatch-macros.h
View File

@ -17,6 +17,17 @@ struct kpatch_unload {
char *objname; /* filled in by create-diff-object */
};
/*
* KPATCH_IGNORE_FUNCTION macro
*
* This macro is for ignoring functions that may change as a side effect of a
* change in another function. The WARN class of macros, for example, embed
* the line number in an instruction, which will cause the function to be
* detected as changed when, in fact, there has been no functional change.
*/
#define KPATCH_IGNORE_FUNCTION(_fn) \
void *__kpatch_ignore_func_##_fn __section(.kpatch.ignore.funcs) = _fn;
/*
* KPATCH_LOAD_HOOK macro
*

27
kpatch-build/create-diff-object.c
View File

@ -1376,6 +1376,32 @@ void kpatch_include_debug_sections(struct kpatch_elf *kelf)
}
}
void kpatch_mark_ignored_funcs_same(struct kpatch_elf *kelf)
{
struct section *sec;
struct rela *rela;
sec = find_section_by_name(&kelf->sections, ".kpatch.ignore.funcs");
if (!sec)
return;
list_for_each_entry(rela, &sec->rela->relas, list) {
if (!rela->sym->sec)
ERROR("expected bundled symbol");
if (rela->sym->type != STT_FUNC)
ERROR("expected function symbol");
log_normal("ignoring function %s\n", rela->sym->name);
if (rela->sym->status != CHANGED)
log_normal("NOTICE: no change detected in function %s, unnecessary KPATCH_IGNORE_FUNC()?\n", rela->sym->name);
rela->sym->status = SAME;
rela->sym->sec->status = SAME;
if (rela->sym->sec->secsym)
rela->sym->sec->secsym->status = SAME;
if (rela->sym->sec->rela)
rela->sym->sec->rela->status = SAME;
}
}
void kpatch_process_special_sections(struct kpatch_elf *kelf)
{
struct special_section *special;
@ -2306,6 +2332,7 @@ int main(int argc, char *argv[])
* in vmlinux can be linked to.
*/
kpatch_replace_sections_syms(kelf_patched);
kpatch_mark_ignored_funcs_same(kelf_patched);
kpatch_process_special_sections(kelf_patched);