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Date: Fri, 22 Apr 2022 10:35:08 -0000
From: "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Josh Poimboeuf <jpoimboe@...hat.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Miroslav Benes <mbenes@...e.cz>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] objtool: Reorganize cmdline options
The following commit has been merged into the objtool/core branch of tip:
Commit-ID: 2daf7faba7ded8703e4b4ebc8b161f22272fc91a
Gitweb: https://git.kernel.org/tip/2daf7faba7ded8703e4b4ebc8b161f22272fc91a
Author: Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Mon, 18 Apr 2022 09:50:26 -07:00
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 22 Apr 2022 12:32:01 +02:00
objtool: Reorganize cmdline options
Split the existing options into two groups: actions, which actually do
something; and options, which modify the actions in some way.
Also there's no need to have short flags for all the non-action options.
Reserve short flags for the more important actions.
While at it:
- change a few of the short flags to be more intuitive
- make option descriptions more consistently descriptive
- sort options in the source like they are when printed
- move options to a global struct
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Miroslav Benes <mbenes@...e.cz>
Link: https://lkml.kernel.org/r/9dcaa752f83aca24b1b21f0b0eeb28a0c181c0b0.1650300597.git.jpoimboe@redhat.com
---
scripts/Makefile.build | 10 ++--
scripts/link-vmlinux.sh | 30 +++++++-----
tools/objtool/arch/x86/decode.c | 2 +-
tools/objtool/arch/x86/special.c | 2 +-
tools/objtool/builtin-check.c | 40 +++++++--------
tools/objtool/check.c | 62 ++++++++++++------------
tools/objtool/elf.c | 8 +--
tools/objtool/include/objtool/builtin.h | 26 ++++++++--
tools/objtool/objtool.c | 6 +-
9 files changed, 108 insertions(+), 78 deletions(-)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 33c1ed5..dd9d582 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -228,14 +228,14 @@ objtool := $(objtree)/tools/objtool/objtool
objtool_args = \
$(if $(CONFIG_UNWINDER_ORC),orc generate,check) \
- $(if $(part-of-module), --module) \
$(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt) \
- $(if $(CONFIG_FRAME_POINTER),, --no-fp) \
- $(if $(CONFIG_GCOV_KERNEL), --no-unreachable) \
+ $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \
$(if $(CONFIG_RETPOLINE), --retpoline) \
+ $(if $(CONFIG_SLS), --sls) \
$(if $(CONFIG_X86_SMAP), --uaccess) \
- $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \
- $(if $(CONFIG_SLS), --sls)
+ $(if $(part-of-module), --module) \
+ $(if $(CONFIG_FRAME_POINTER),, --no-fp) \
+ $(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 9361a1e..c6e9fef 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -117,8 +117,6 @@ objtool_link()
objtoolcmd="orc generate"
fi
- objtoolopt="${objtoolopt} --lto"
-
if is_enabled CONFIG_X86_KERNEL_IBT; then
objtoolopt="${objtoolopt} --ibt"
fi
@@ -126,6 +124,8 @@ objtool_link()
if is_enabled CONFIG_FTRACE_MCOUNT_USE_OBJTOOL; then
objtoolopt="${objtoolopt} --mcount"
fi
+
+ objtoolopt="${objtoolopt} --lto"
fi
if is_enabled CONFIG_VMLINUX_VALIDATION; then
@@ -133,25 +133,33 @@ objtool_link()
fi
if [ -n "${objtoolopt}" ]; then
+
if [ -z "${objtoolcmd}" ]; then
objtoolcmd="check"
fi
- objtoolopt="${objtoolopt} --vmlinux"
- if ! is_enabled CONFIG_FRAME_POINTER; then
- objtoolopt="${objtoolopt} --no-fp"
- fi
- if is_enabled CONFIG_GCOV_KERNEL; then
- objtoolopt="${objtoolopt} --no-unreachable"
- fi
+
if is_enabled CONFIG_RETPOLINE; then
objtoolopt="${objtoolopt} --retpoline"
fi
+
+ if is_enabled CONFIG_SLS; then
+ objtoolopt="${objtoolopt} --sls"
+ fi
+
if is_enabled CONFIG_X86_SMAP; then
objtoolopt="${objtoolopt} --uaccess"
fi
- if is_enabled CONFIG_SLS; then
- objtoolopt="${objtoolopt} --sls"
+
+ if ! is_enabled CONFIG_FRAME_POINTER; then
+ objtoolopt="${objtoolopt} --no-fp"
fi
+
+ if is_enabled CONFIG_GCOV_KERNEL; then
+ objtoolopt="${objtoolopt} --no-unreachable"
+ fi
+
+ objtoolopt="${objtoolopt} --vmlinux"
+
info OBJTOOL ${1}
tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1}
fi
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index 943cb41..8b990a5 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -581,7 +581,7 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
break;
case 0xc7: /* mov imm, r/m */
- if (!noinstr)
+ if (!opts.noinstr)
break;
if (insn.length == 3+4+4 && !strncmp(sec->name, ".init.text", 10)) {
diff --git a/tools/objtool/arch/x86/special.c b/tools/objtool/arch/x86/special.c
index e707d9b..7c97b73 100644
--- a/tools/objtool/arch/x86/special.c
+++ b/tools/objtool/arch/x86/special.c
@@ -20,7 +20,7 @@ void arch_handle_alternative(unsigned short feature, struct special_alt *alt)
* find paths that see the STAC but take the NOP instead of
* CLAC and the other way around.
*/
- if (uaccess)
+ if (opts.uaccess)
alt->skip_orig = true;
else
alt->skip_alt = true;
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index fc6975a..bc447b3 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -19,12 +19,10 @@
#include <objtool/builtin.h>
#include <objtool/objtool.h>
-bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
- lto, vmlinux, mcount, noinstr, backup, sls, dryrun,
- ibt;
+struct opts opts;
static const char * const check_usage[] = {
- "objtool check [<options>] file.o",
+ "objtool check <actions> [<options>] file.o",
NULL,
};
@@ -34,21 +32,25 @@ static const char * const env_usage[] = {
};
const struct option check_options[] = {
- OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
- OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
- OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
- OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
- OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
- OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
- OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
- OPT_BOOLEAN(0, "lto", <o, "whole-archive like runs"),
- OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),
- OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
- OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
- OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"),
- OPT_BOOLEAN('S', "sls", &sls, "validate straight-line-speculation"),
- OPT_BOOLEAN(0, "dry-run", &dryrun, "don't write the modifications"),
- OPT_BOOLEAN(0, "ibt", &ibt, "validate ENDBR placement"),
+ OPT_GROUP("Actions:"),
+ OPT_BOOLEAN('i', "ibt", &opts.ibt, "validate and annotate IBT"),
+ OPT_BOOLEAN('m', "mcount", &opts.mcount, "annotate mcount/fentry calls for ftrace"),
+ OPT_BOOLEAN('n', "noinstr", &opts.noinstr, "validate noinstr rules"),
+ OPT_BOOLEAN('r', "retpoline", &opts.retpoline, "validate and annotate retpoline usage"),
+ OPT_BOOLEAN('l', "sls", &opts.sls, "validate straight-line-speculation mitigations"),
+ OPT_BOOLEAN('u', "uaccess", &opts.uaccess, "validate uaccess rules for SMAP"),
+
+ OPT_GROUP("Options:"),
+ OPT_BOOLEAN(0, "backtrace", &opts.backtrace, "unwind on error"),
+ OPT_BOOLEAN(0, "backup", &opts.backup, "create .orig files before modification"),
+ OPT_BOOLEAN(0, "dry-run", &opts.dryrun, "don't write modifications"),
+ OPT_BOOLEAN(0, "lto", &opts.lto, "whole-archive like runs"),
+ OPT_BOOLEAN(0, "module", &opts.module, "object is part of a kernel module"),
+ OPT_BOOLEAN(0, "no-fp", &opts.no_fp, "skip frame pointer validation"),
+ OPT_BOOLEAN(0, "no-unreachable", &opts.no_unreachable, "skip 'unreachable instruction' warnings"),
+ OPT_BOOLEAN(0, "stats", &opts.stats, "print statistics"),
+ OPT_BOOLEAN(0, "vmlinux", &opts.vmlinux, "vmlinux.o validation"),
+
OPT_END(),
};
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index ca5b746..3362cc3 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -273,7 +273,7 @@ static void init_insn_state(struct insn_state *state, struct section *sec)
* not correctly determine insn->call_dest->sec (external symbols do
* not have a section).
*/
- if (vmlinux && noinstr && sec)
+ if (opts.vmlinux && opts.noinstr && sec)
state->noinstr = sec->noinstr;
}
@@ -339,7 +339,7 @@ static void *cfi_hash_alloc(unsigned long size)
if (cfi_hash == (void *)-1L) {
WARN("mmap fail cfi_hash");
cfi_hash = NULL;
- } else if (stats) {
+ } else if (opts.stats) {
printf("cfi_bits: %d\n", cfi_bits);
}
@@ -434,7 +434,7 @@ static int decode_instructions(struct objtool_file *file)
}
}
- if (stats)
+ if (opts.stats)
printf("nr_insns: %lu\n", nr_insns);
return 0;
@@ -497,7 +497,7 @@ static int init_pv_ops(struct objtool_file *file)
struct symbol *sym;
int idx, nr;
- if (!noinstr)
+ if (!opts.noinstr)
return 0;
file->pv_ops = NULL;
@@ -668,7 +668,7 @@ static int create_static_call_sections(struct objtool_file *file)
key_sym = find_symbol_by_name(file->elf, tmp);
if (!key_sym) {
- if (!module) {
+ if (!opts.module) {
WARN("static_call: can't find static_call_key symbol: %s", tmp);
return -1;
}
@@ -761,7 +761,7 @@ static int create_ibt_endbr_seal_sections(struct objtool_file *file)
list_for_each_entry(insn, &file->endbr_list, call_node)
idx++;
- if (stats) {
+ if (opts.stats) {
printf("ibt: ENDBR at function start: %d\n", file->nr_endbr);
printf("ibt: ENDBR inside functions: %d\n", file->nr_endbr_int);
printf("ibt: superfluous ENDBR: %d\n", idx);
@@ -1028,7 +1028,7 @@ static void add_uaccess_safe(struct objtool_file *file)
struct symbol *func;
const char **name;
- if (!uaccess)
+ if (!opts.uaccess)
return;
for (name = uaccess_safe_builtin; *name; name++) {
@@ -1170,7 +1170,7 @@ static void annotate_call_site(struct objtool_file *file,
return;
}
- if (mcount && sym->fentry) {
+ if (opts.mcount && sym->fentry) {
if (sibling)
WARN_FUNC("Tail call to __fentry__ !?!?", insn->sec, insn->offset);
@@ -1256,7 +1256,7 @@ static bool is_first_func_insn(struct objtool_file *file, struct instruction *in
if (insn->offset == insn->func->offset)
return true;
- if (ibt) {
+ if (opts.ibt) {
struct instruction *prev = prev_insn_same_sym(file, insn);
if (prev && prev->type == INSN_ENDBR &&
@@ -1699,7 +1699,7 @@ static int add_special_section_alts(struct objtool_file *file)
free(special_alt);
}
- if (stats) {
+ if (opts.stats) {
printf("jl\\\tNOP\tJMP\n");
printf("short:\t%ld\t%ld\n", file->jl_nop_short, file->jl_short);
printf("long:\t%ld\t%ld\n", file->jl_nop_long, file->jl_long);
@@ -1945,7 +1945,7 @@ static int read_unwind_hints(struct objtool_file *file)
insn->hint = true;
- if (ibt && hint->type == UNWIND_HINT_TYPE_REGS_PARTIAL) {
+ if (opts.ibt && hint->type == UNWIND_HINT_TYPE_REGS_PARTIAL) {
struct symbol *sym = find_symbol_by_offset(insn->sec, insn->offset);
if (sym && sym->bind == STB_GLOBAL &&
@@ -2806,7 +2806,7 @@ static int update_cfi_state(struct instruction *insn,
}
/* detect when asm code uses rbp as a scratch register */
- if (!no_fp && insn->func && op->src.reg == CFI_BP &&
+ if (!opts.no_fp && insn->func && op->src.reg == CFI_BP &&
cfa->base != CFI_BP)
cfi->bp_scratch = true;
break;
@@ -3363,7 +3363,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
ret = validate_branch(file, func, alt->insn, state);
if (ret) {
- if (backtrace)
+ if (opts.backtrace)
BT_FUNC("(alt)", insn);
return ret;
}
@@ -3379,7 +3379,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
switch (insn->type) {
case INSN_RETURN:
- if (sls && !insn->retpoline_safe &&
+ if (opts.sls && !insn->retpoline_safe &&
next_insn && next_insn->type != INSN_TRAP) {
WARN_FUNC("missing int3 after ret",
insn->sec, insn->offset);
@@ -3392,7 +3392,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
if (ret)
return ret;
- if (!no_fp && func && !is_fentry_call(insn) &&
+ if (!opts.no_fp && func && !is_fentry_call(insn) &&
!has_valid_stack_frame(&state)) {
WARN_FUNC("call without frame pointer save/setup",
sec, insn->offset);
@@ -3415,7 +3415,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
ret = validate_branch(file, func,
insn->jump_dest, state);
if (ret) {
- if (backtrace)
+ if (opts.backtrace)
BT_FUNC("(branch)", insn);
return ret;
}
@@ -3427,7 +3427,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
break;
case INSN_JUMP_DYNAMIC:
- if (sls && !insn->retpoline_safe &&
+ if (opts.sls && !insn->retpoline_safe &&
next_insn && next_insn->type != INSN_TRAP) {
WARN_FUNC("missing int3 after indirect jump",
insn->sec, insn->offset);
@@ -3499,7 +3499,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
break;
}
- if (ibt)
+ if (opts.ibt)
validate_ibt_insn(file, insn);
if (insn->dead_end)
@@ -3541,7 +3541,7 @@ static int validate_unwind_hints(struct objtool_file *file, struct section *sec)
while (&insn->list != &file->insn_list && (!sec || insn->sec == sec)) {
if (insn->hint && !insn->visited && !insn->ignore) {
ret = validate_branch(file, insn->func, insn, state);
- if (ret && backtrace)
+ if (ret && opts.backtrace)
BT_FUNC("<=== (hint)", insn);
warnings += ret;
}
@@ -3571,7 +3571,7 @@ static int validate_retpoline(struct objtool_file *file)
* loaded late, they very much do need retpoline in their
* .init.text
*/
- if (!strcmp(insn->sec->name, ".init.text") && !module)
+ if (!strcmp(insn->sec->name, ".init.text") && !opts.module)
continue;
WARN_FUNC("indirect %s found in RETPOLINE build",
@@ -3621,7 +3621,7 @@ static bool ignore_unreachable_insn(struct objtool_file *file, struct instructio
* In this case we'll find a piece of code (whole function) that is not
* covered by a !section symbol. Ignore them.
*/
- if (!insn->func && lto) {
+ if (!insn->func && opts.lto) {
int size = find_symbol_hole_containing(insn->sec, insn->offset);
unsigned long end = insn->offset + size;
@@ -3728,7 +3728,7 @@ static int validate_symbol(struct objtool_file *file, struct section *sec,
state->uaccess = sym->uaccess_safe;
ret = validate_branch(file, insn->func, insn, *state);
- if (ret && backtrace)
+ if (ret && opts.backtrace)
BT_FUNC("<=== (sym)", insn);
return ret;
}
@@ -3853,12 +3853,12 @@ int check(struct objtool_file *file)
{
int ret, warnings = 0;
- if (lto && !(vmlinux || module)) {
+ if (opts.lto && !(opts.vmlinux || opts.module)) {
fprintf(stderr, "--lto requires: --vmlinux or --module\n");
return 1;
}
- if (ibt && !lto) {
+ if (opts.ibt && !opts.lto) {
fprintf(stderr, "--ibt requires: --lto\n");
return 1;
}
@@ -3883,7 +3883,7 @@ int check(struct objtool_file *file)
if (list_empty(&file->insn_list))
goto out;
- if (vmlinux && !lto) {
+ if (opts.vmlinux && !opts.lto) {
ret = validate_vmlinux_functions(file);
if (ret < 0)
goto out;
@@ -3892,7 +3892,7 @@ int check(struct objtool_file *file)
goto out;
}
- if (retpoline) {
+ if (opts.retpoline) {
ret = validate_retpoline(file);
if (ret < 0)
return ret;
@@ -3909,7 +3909,7 @@ int check(struct objtool_file *file)
goto out;
warnings += ret;
- if (ibt) {
+ if (opts.ibt) {
ret = validate_ibt(file);
if (ret < 0)
goto out;
@@ -3928,28 +3928,28 @@ int check(struct objtool_file *file)
goto out;
warnings += ret;
- if (retpoline) {
+ if (opts.retpoline) {
ret = create_retpoline_sites_sections(file);
if (ret < 0)
goto out;
warnings += ret;
}
- if (mcount) {
+ if (opts.mcount) {
ret = create_mcount_loc_sections(file);
if (ret < 0)
goto out;
warnings += ret;
}
- if (ibt) {
+ if (opts.ibt) {
ret = create_ibt_endbr_seal_sections(file);
if (ret < 0)
goto out;
warnings += ret;
}
- if (stats) {
+ if (opts.stats) {
printf("nr_insns_visited: %ld\n", nr_insns_visited);
printf("nr_cfi: %ld\n", nr_cfi);
printf("nr_cfi_reused: %ld\n", nr_cfi_reused);
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index ebf2ba5..0f6fa37 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -355,7 +355,7 @@ static int read_sections(struct elf *elf)
elf_hash_add(section_name, &sec->name_hash, str_hash(sec->name));
}
- if (stats) {
+ if (opts.stats) {
printf("nr_sections: %lu\n", (unsigned long)sections_nr);
printf("section_bits: %d\n", elf->section_bits);
}
@@ -475,7 +475,7 @@ static int read_symbols(struct elf *elf)
elf_add_symbol(elf, sym);
}
- if (stats) {
+ if (opts.stats) {
printf("nr_symbols: %lu\n", (unsigned long)symbols_nr);
printf("symbol_bits: %d\n", elf->symbol_bits);
}
@@ -843,7 +843,7 @@ static int read_relocs(struct elf *elf)
tot_reloc += nr_reloc;
}
- if (stats) {
+ if (opts.stats) {
printf("max_reloc: %lu\n", max_reloc);
printf("tot_reloc: %lu\n", tot_reloc);
printf("reloc_bits: %d\n", elf->reloc_bits);
@@ -1222,7 +1222,7 @@ int elf_write(struct elf *elf)
struct section *sec;
Elf_Scn *s;
- if (dryrun)
+ if (opts.dryrun)
return 0;
/* Update changed relocation sections and section headers: */
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index c39dbfa..87c1a73 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -8,9 +8,29 @@
#include <subcmd/parse-options.h>
extern const struct option check_options[];
-extern bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
- lto, vmlinux, mcount, noinstr, backup, sls, dryrun,
- ibt;
+
+struct opts {
+ /* actions: */
+ bool ibt;
+ bool mcount;
+ bool noinstr;
+ bool retpoline;
+ bool sls;
+ bool uaccess;
+
+ /* options: */
+ bool backtrace;
+ bool backup;
+ bool dryrun;
+ bool lto;
+ bool module;
+ bool no_fp;
+ bool no_unreachable;
+ bool stats;
+ bool vmlinux;
+};
+
+extern struct opts opts;
extern int cmd_parse_options(int argc, const char **argv, const char * const usage[]);
diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
index 843ff3c..a0f3d3c 100644
--- a/tools/objtool/objtool.c
+++ b/tools/objtool/objtool.c
@@ -118,7 +118,7 @@ struct objtool_file *objtool_open_read(const char *_objname)
if (!file.elf)
return NULL;
- if (backup && !objtool_create_backup(objname)) {
+ if (opts.backup && !objtool_create_backup(objname)) {
WARN("can't create backup file");
return NULL;
}
@@ -129,7 +129,7 @@ struct objtool_file *objtool_open_read(const char *_objname)
INIT_LIST_HEAD(&file.static_call_list);
INIT_LIST_HEAD(&file.mcount_loc_list);
INIT_LIST_HEAD(&file.endbr_list);
- file.ignore_unreachables = no_unreachable;
+ file.ignore_unreachables = opts.no_unreachable;
file.hints = false;
return &file;
@@ -137,7 +137,7 @@ struct objtool_file *objtool_open_read(const char *_objname)
void objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func)
{
- if (!noinstr)
+ if (!opts.noinstr)
return;
if (!f->pv_ops) {
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