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Message-ID: <d210a1a75a284b460f2269fccbecfe10f68bc569.1758067942.git.jpoimboe@kernel.org>
Date: Wed, 17 Sep 2025 09:03:24 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
Petr Mladek <pmladek@...e.com>,
Miroslav Benes <mbenes@...e.cz>,
Joe Lawrence <joe.lawrence@...hat.com>,
live-patching@...r.kernel.org,
Song Liu <song@...nel.org>,
laokz <laokz@...mail.com>,
Jiri Kosina <jikos@...nel.org>,
Marcos Paulo de Souza <mpdesouza@...e.com>,
Weinan Liu <wnliu@...gle.com>,
Fazla Mehrab <a.mehrab@...edance.com>,
Chen Zhongjin <chenzhongjin@...wei.com>,
Puranjay Mohan <puranjay@...nel.org>,
Dylan Hatch <dylanbhatch@...gle.com>,
Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v4 16/63] objtool: Remove error handling boilerplate
Up to a certain point in objtool's execution, all errors are fatal and
return -1. When propagating such errors, just return -1 directly
instead of trying to propagate the original return code. This helps
make the code more compact and the behavior more explicit.
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
tools/objtool/check.c | 151 +++++++++++++++-------------------------
tools/objtool/special.c | 9 +--
2 files changed, 59 insertions(+), 101 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 6d6323508e4b8..dbdbbddd01ecb 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -430,7 +430,6 @@ static int decode_instructions(struct objtool_file *file)
struct symbol *func;
unsigned long offset;
struct instruction *insn;
- int ret;
for_each_sec(file, sec) {
struct instruction *insns = NULL;
@@ -479,11 +478,8 @@ static int decode_instructions(struct objtool_file *file)
insn->offset = offset;
insn->prev_len = prev_len;
- ret = arch_decode_instruction(file, sec, offset,
- sec->sh.sh_size - offset,
- insn);
- if (ret)
- return ret;
+ if (arch_decode_instruction(file, sec, offset, sec->sh.sh_size - offset, insn))
+ return -1;
prev_len = insn->len;
@@ -599,7 +595,7 @@ static int init_pv_ops(struct objtool_file *file)
};
const char *pv_ops;
struct symbol *sym;
- int idx, nr, ret;
+ int idx, nr;
if (!opts.noinstr)
return 0;
@@ -621,9 +617,8 @@ static int init_pv_ops(struct objtool_file *file)
INIT_LIST_HEAD(&file->pv_ops[idx].targets);
for (idx = 0; (pv_ops = pv_ops_tables[idx]); idx++) {
- ret = add_pv_ops(file, pv_ops);
- if (ret)
- return ret;
+ if (add_pv_ops(file, pv_ops))
+ return -1;
}
return 0;
@@ -1484,7 +1479,6 @@ static int add_jump_destinations(struct objtool_file *file)
struct reloc *reloc;
struct section *dest_sec;
unsigned long dest_off;
- int ret;
for_each_insn(file, insn) {
struct symbol *func = insn_func(insn);
@@ -1507,9 +1501,8 @@ static int add_jump_destinations(struct objtool_file *file)
dest_sec = reloc->sym->sec;
dest_off = arch_dest_reloc_offset(reloc_addend(reloc));
} else if (reloc->sym->retpoline_thunk) {
- ret = add_retpoline_call(file, insn);
- if (ret)
- return ret;
+ if (add_retpoline_call(file, insn))
+ return -1;
continue;
} else if (reloc->sym->return_thunk) {
add_return_call(file, insn, true);
@@ -1519,9 +1512,8 @@ static int add_jump_destinations(struct objtool_file *file)
* External sibling call or internal sibling call with
* STT_FUNC reloc.
*/
- ret = add_call_dest(file, insn, reloc->sym, true);
- if (ret)
- return ret;
+ if (add_call_dest(file, insn, reloc->sym, true))
+ return -1;
continue;
} else if (reloc->sym->sec->idx) {
dest_sec = reloc->sym->sec;
@@ -1570,9 +1562,8 @@ static int add_jump_destinations(struct objtool_file *file)
*/
if (jump_dest->sym && jump_dest->offset == jump_dest->sym->offset) {
if (jump_dest->sym->retpoline_thunk) {
- ret = add_retpoline_call(file, insn);
- if (ret)
- return ret;
+ if (add_retpoline_call(file, insn))
+ return -1;
continue;
}
if (jump_dest->sym->return_thunk) {
@@ -1613,9 +1604,8 @@ static int add_jump_destinations(struct objtool_file *file)
* Internal sibling call without reloc or with
* STT_SECTION reloc.
*/
- ret = add_call_dest(file, insn, insn_func(jump_dest), true);
- if (ret)
- return ret;
+ if (add_call_dest(file, insn, insn_func(jump_dest), true))
+ return -1;
continue;
}
@@ -1645,7 +1635,6 @@ static int add_call_destinations(struct objtool_file *file)
unsigned long dest_off;
struct symbol *dest;
struct reloc *reloc;
- int ret;
for_each_insn(file, insn) {
struct symbol *func = insn_func(insn);
@@ -1657,9 +1646,8 @@ static int add_call_destinations(struct objtool_file *file)
dest_off = arch_jump_destination(insn);
dest = find_call_destination(insn->sec, dest_off);
- ret = add_call_dest(file, insn, dest, false);
- if (ret)
- return ret;
+ if (add_call_dest(file, insn, dest, false))
+ return -1;
if (func && func->ignore)
continue;
@@ -1683,19 +1671,16 @@ static int add_call_destinations(struct objtool_file *file)
return -1;
}
- ret = add_call_dest(file, insn, dest, false);
- if (ret)
- return ret;
+ if (add_call_dest(file, insn, dest, false))
+ return -1;
} else if (reloc->sym->retpoline_thunk) {
- ret = add_retpoline_call(file, insn);
- if (ret)
- return ret;
+ if (add_retpoline_call(file, insn))
+ return -1;
} else {
- ret = add_call_dest(file, insn, reloc->sym, false);
- if (ret)
- return ret;
+ if (add_call_dest(file, insn, reloc->sym, false))
+ return -1;
}
}
@@ -1912,7 +1897,6 @@ static int add_special_section_alts(struct objtool_file *file)
struct instruction *orig_insn, *new_insn;
struct special_alt *special_alt, *tmp;
struct alternative *alt;
- int ret;
if (special_get_alts(file->elf, &special_alts))
return -1;
@@ -1944,16 +1928,12 @@ static int add_special_section_alts(struct objtool_file *file)
continue;
}
- ret = handle_group_alt(file, special_alt, orig_insn,
- &new_insn);
- if (ret)
- return ret;
+ if (handle_group_alt(file, special_alt, orig_insn, &new_insn))
+ return -1;
} else if (special_alt->jump_or_nop) {
- ret = handle_jump_alt(file, special_alt, orig_insn,
- &new_insn);
- if (ret)
- return ret;
+ if (handle_jump_alt(file, special_alt, orig_insn, &new_insn))
+ return -1;
}
alt = calloc(1, sizeof(*alt));
@@ -2141,15 +2121,13 @@ static int add_func_jump_tables(struct objtool_file *file,
struct symbol *func)
{
struct instruction *insn;
- int ret;
func_for_each_insn(file, func, insn) {
if (!insn_jump_table(insn))
continue;
- ret = add_jump_table(file, insn);
- if (ret)
- return ret;
+ if (add_jump_table(file, insn))
+ return -1;
}
return 0;
@@ -2163,7 +2141,6 @@ static int add_func_jump_tables(struct objtool_file *file,
static int add_jump_table_alts(struct objtool_file *file)
{
struct symbol *func;
- int ret;
if (!file->rodata)
return 0;
@@ -2173,9 +2150,8 @@ static int add_jump_table_alts(struct objtool_file *file)
continue;
mark_func_jump_tables(file, func);
- ret = add_func_jump_tables(file, func);
- if (ret)
- return ret;
+ if (add_func_jump_tables(file, func))
+ return -1;
}
return 0;
@@ -2299,7 +2275,7 @@ static int read_annotate(struct objtool_file *file,
struct instruction *insn;
struct reloc *reloc;
uint64_t offset;
- int type, ret;
+ int type;
sec = find_section_by_name(file->elf, ".discard.annotate_insn");
if (!sec)
@@ -2329,9 +2305,8 @@ static int read_annotate(struct objtool_file *file,
return -1;
}
- ret = func(file, type, insn);
- if (ret < 0)
- return ret;
+ if (func(file, type, insn))
+ return -1;
}
return 0;
@@ -2540,76 +2515,62 @@ static void mark_rodata(struct objtool_file *file)
static int decode_sections(struct objtool_file *file)
{
- int ret;
-
mark_rodata(file);
- ret = init_pv_ops(file);
- if (ret)
- return ret;
+ if (init_pv_ops(file))
+ return -1;
/*
* Must be before add_{jump_call}_destination.
*/
- ret = classify_symbols(file);
- if (ret)
- return ret;
+ if (classify_symbols(file))
+ return -1;
- ret = decode_instructions(file);
- if (ret)
- return ret;
+ if (decode_instructions(file))
+ return -1;
- ret = add_ignores(file);
- if (ret)
- return ret;
+ if (add_ignores(file))
+ return -1;
add_uaccess_safe(file);
- ret = read_annotate(file, __annotate_early);
- if (ret)
- return ret;
+ if (read_annotate(file, __annotate_early))
+ return -1;
/*
* Must be before add_jump_destinations(), which depends on 'func'
* being set for alternatives, to enable proper sibling call detection.
*/
if (opts.stackval || opts.orc || opts.uaccess || opts.noinstr) {
- ret = add_special_section_alts(file);
- if (ret)
- return ret;
+ if (add_special_section_alts(file))
+ return -1;
}
- ret = add_jump_destinations(file);
- if (ret)
- return ret;
+ if (add_jump_destinations(file))
+ return -1;
/*
* Must be before add_call_destination(); it changes INSN_CALL to
* INSN_JUMP.
*/
- ret = read_annotate(file, __annotate_ifc);
- if (ret)
- return ret;
+ if (read_annotate(file, __annotate_ifc))
+ return -1;
- ret = add_call_destinations(file);
- if (ret)
- return ret;
+ if (add_call_destinations(file))
+ return -1;
- ret = add_jump_table_alts(file);
- if (ret)
- return ret;
+ if (add_jump_table_alts(file))
+ return -1;
- ret = read_unwind_hints(file);
- if (ret)
- return ret;
+ if (read_unwind_hints(file))
+ return -1;
/*
* Must be after add_call_destinations() such that it can override
* dead_end_function() marks.
*/
- ret = read_annotate(file, __annotate_late);
- if (ret)
- return ret;
+ if (read_annotate(file, __annotate_late))
+ return -1;
return 0;
}
diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index c80fed8a840ee..c0beefb93b62e 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c
@@ -133,7 +133,7 @@ int special_get_alts(struct elf *elf, struct list_head *alts)
struct section *sec;
unsigned int nr_entries;
struct special_alt *alt;
- int idx, ret;
+ int idx;
INIT_LIST_HEAD(alts);
@@ -157,11 +157,8 @@ int special_get_alts(struct elf *elf, struct list_head *alts)
}
memset(alt, 0, sizeof(*alt));
- ret = get_alt_entry(elf, entry, sec, idx, alt);
- if (ret > 0)
- continue;
- if (ret < 0)
- return ret;
+ if (get_alt_entry(elf, entry, sec, idx, alt))
+ return -1;
list_add_tail(&alt->list, alts);
}
--
2.50.0
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