[tip:,objtool/core] objtool: Limit unreachable warnings to once per function
Commit Message
The following commit has been merged into the objtool/core branch of tip:
Commit-ID: 5e3992fe72748ed3892be876f09d4d990548b7af
Gitweb: https://git.kernel.org/tip/5e3992fe72748ed3892be876f09d4d990548b7af
Author: Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate: Tue, 18 Apr 2023 14:27:47 -07:00
Committer: Josh Poimboeuf <jpoimboe@kernel.org>
CommitterDate: Tue, 16 May 2023 06:31:51 -07:00
objtool: Limit unreachable warnings to once per function
Unreachable instruction warnings are limited to once per object file.
That no longer makes sense for vmlinux validation, which might have
more unreachable instructions lurking in other places. Change it to
once per function.
Note this affects some other (much rarer) non-fatal warnings as well.
In general I think one-warning-per-function makes sense, as related
warnings can accumulate quickly and we want to eventually get back to
failing the build with -Werror anyway.
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lore.kernel.org/r/9d38f881bfc34e031c74e4e90064ccb3e49f599a.1681853186.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
tools/objtool/check.c | 5 +++--
tools/objtool/include/objtool/elf.h | 1 +
tools/objtool/include/objtool/warn.h | 7 ++++++-
3 files changed, 10 insertions(+), 3 deletions(-)
@@ -4514,6 +4514,7 @@ static int validate_sls(struct objtool_file *file)
static int validate_reachable_instructions(struct objtool_file *file)
{
struct instruction *insn;
+ int warnings = 0;
if (file->ignore_unreachables)
return 0;
@@ -4523,10 +4524,10 @@ static int validate_reachable_instructions(struct objtool_file *file)
continue;
WARN_INSN(insn, "unreachable instruction");
- return 1;
+ warnings++;
}
- return 0;
+ return warnings;
}
int check(struct objtool_file *file)
@@ -61,6 +61,7 @@ struct symbol {
u8 return_thunk : 1;
u8 fentry : 1;
u8 profiling_func : 1;
+ u8 warned : 1;
struct list_head pv_target;
struct list_head reloc_list;
};
@@ -55,7 +55,12 @@ static inline char *offstr(struct section *sec, unsigned long offset)
#define WARN_INSN(insn, format, ...) \
({ \
- WARN_FUNC(format, insn->sec, insn->offset, ##__VA_ARGS__); \
+ struct instruction *_insn = (insn); \
+ if (!_insn->sym || !_insn->sym->warned) \
+ WARN_FUNC(format, _insn->sec, _insn->offset, \
+ ##__VA_ARGS__); \
+ if (_insn->sym) \
+ _insn->sym->warned = 1; \
})
#define BT_FUNC(format, insn, ...) \