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![Linus Torvalds](/assets/img/avatar_default.png)
- kprobes: use struct_size() for variable size kretprobe_instance data structure. - eprobe: Simplify trace_eprobe list iteration. - probe events: Data structure field access support on BTF argument. . Update BTF argument support on the functions in the kernel loadable modules (only loaded modules are supported). . Move generic BTF access function (search function prototype and get function parameters) to a separated file. . Add a function to search a member of data structure in BTF. . Support accessing BTF data structure member from probe args by C-like arrow('->') and dot('.') operators. e.g. 't sched_switch next=next->pid vruntime=next->se.vruntime' . Support accessing BTF data structure member from $retval. e.g. 'f getname_flags%return +0($retval->name):string' . Add string type checking if BTF type info is available. This will reject if user specify ":string" type for non "char pointer" type. . Automatically assume the fprobe event as a function return event if $retval is used. - selftests/ftrace: Add BTF data field access test cases. - Documentation: Update fprobe event example with BTF data field. -----BEGIN PGP SIGNATURE----- iQFPBAABCgA5FiEEh7BulGwFlgAOi5DV2/sHvwUrPxsFAmTycQkbHG1hc2FtaS5o aXJhbWF0c3VAZ21haWwuY29tAAoJENv7B78FKz8bqS8H/jeR1JhOzIXOvTw7XCFm MrSY/SKi8tQfV6lau2UmoYdbYvYjpqL34XLOQPNf2/lrcL2M9aNYXk9fbhlW8enx vkMyKQ0E5anixkF4vsTbEl9DaprxbpsPVACmZ/7VjQk2JuXIdyaNk8hno9LgIcEq udztb0o2HmDFqAXfRi0LvlSTAIwvXZ+usmEvYpaq1g2WwrCe7NHEYl42vMpj+h4H 9l4t5rA9JyPPX4yQUjtKGW5eRVTwDTm/Gn6DRzYfYzkkiBZv27qfovzBOt672LgG hyot+u7XeKvZx3jjnF7+mRWoH/m0dqyhyi/nPhpIE09VhgwclrbGAcDuR1x6sp01 PHY= =hBDN -----END PGP SIGNATURE----- Merge tag 'probes-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull probes updates from Masami Hiramatsu: - kprobes: use struct_size() for variable size kretprobe_instance data structure. - eprobe: Simplify trace_eprobe list iteration. - probe events: Data structure field access support on BTF argument. - Update BTF argument support on the functions in the kernel loadable modules (only loaded modules are supported). - Move generic BTF access function (search function prototype and get function parameters) to a separated file. - Add a function to search a member of data structure in BTF. - Support accessing BTF data structure member from probe args by C-like arrow('->') and dot('.') operators. e.g. 't sched_switch next=next->pid vruntime=next->se.vruntime' - Support accessing BTF data structure member from $retval. e.g. 'f getname_flags%return +0($retval->name):string' - Add string type checking if BTF type info is available. This will reject if user specify ":string" type for non "char pointer" type. - Automatically assume the fprobe event as a function return event if $retval is used. - selftests/ftrace: Add BTF data field access test cases. - Documentation: Update fprobe event example with BTF data field. * tag 'probes-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: Documentation: tracing: Update fprobe event example with BTF field selftests/ftrace: Add BTF fields access testcases tracing/fprobe-event: Assume fprobe is a return event by $retval tracing/probes: Add string type check with BTF tracing/probes: Support BTF field access from $retval tracing/probes: Support BTF based data structure field access tracing/probes: Add a function to search a member of a struct/union tracing/probes: Move finding func-proto API and getting func-param API to trace_btf tracing/probes: Support BTF argument on module functions tracing/eprobe: Iterate trace_eprobe directly kernel: kprobes: Use struct_size()
574 lines
17 KiB
C
574 lines
17 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2018 Facebook */
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#ifndef _LINUX_BTF_H
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#define _LINUX_BTF_H 1
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#include <linux/types.h>
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#include <linux/bpfptr.h>
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#include <linux/bsearch.h>
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#include <linux/btf_ids.h>
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#include <uapi/linux/btf.h>
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#include <uapi/linux/bpf.h>
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#define BTF_TYPE_EMIT(type) ((void)(type *)0)
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#define BTF_TYPE_EMIT_ENUM(enum_val) ((void)enum_val)
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/* These need to be macros, as the expressions are used in assembler input */
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#define KF_ACQUIRE (1 << 0) /* kfunc is an acquire function */
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#define KF_RELEASE (1 << 1) /* kfunc is a release function */
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#define KF_RET_NULL (1 << 2) /* kfunc returns a pointer that may be NULL */
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/* Trusted arguments are those which are guaranteed to be valid when passed to
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* the kfunc. It is used to enforce that pointers obtained from either acquire
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* kfuncs, or from the main kernel on a tracepoint or struct_ops callback
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* invocation, remain unmodified when being passed to helpers taking trusted
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* args.
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*
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* Consider, for example, the following new task tracepoint:
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*
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* SEC("tp_btf/task_newtask")
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* int BPF_PROG(new_task_tp, struct task_struct *task, u64 clone_flags)
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* {
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* ...
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* }
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*
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* And the following kfunc:
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*
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* BTF_ID_FLAGS(func, bpf_task_acquire, KF_ACQUIRE | KF_TRUSTED_ARGS)
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*
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* All invocations to the kfunc must pass the unmodified, unwalked task:
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*
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* bpf_task_acquire(task); // Allowed
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* bpf_task_acquire(task->last_wakee); // Rejected, walked task
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*
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* Programs may also pass referenced tasks directly to the kfunc:
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*
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* struct task_struct *acquired;
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*
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* acquired = bpf_task_acquire(task); // Allowed, same as above
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* bpf_task_acquire(acquired); // Allowed
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* bpf_task_acquire(task); // Allowed
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* bpf_task_acquire(acquired->last_wakee); // Rejected, walked task
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*
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* Programs may _not_, however, pass a task from an arbitrary fentry/fexit, or
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* kprobe/kretprobe to the kfunc, as BPF cannot guarantee that all of these
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* pointers are guaranteed to be safe. For example, the following BPF program
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* would be rejected:
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*
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* SEC("kretprobe/free_task")
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* int BPF_PROG(free_task_probe, struct task_struct *tsk)
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* {
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* struct task_struct *acquired;
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*
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* acquired = bpf_task_acquire(acquired); // Rejected, not a trusted pointer
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* bpf_task_release(acquired);
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*
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* return 0;
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* }
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*/
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#define KF_TRUSTED_ARGS (1 << 4) /* kfunc only takes trusted pointer arguments */
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#define KF_SLEEPABLE (1 << 5) /* kfunc may sleep */
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#define KF_DESTRUCTIVE (1 << 6) /* kfunc performs destructive actions */
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#define KF_RCU (1 << 7) /* kfunc takes either rcu or trusted pointer arguments */
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/* only one of KF_ITER_{NEW,NEXT,DESTROY} could be specified per kfunc */
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#define KF_ITER_NEW (1 << 8) /* kfunc implements BPF iter constructor */
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#define KF_ITER_NEXT (1 << 9) /* kfunc implements BPF iter next method */
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#define KF_ITER_DESTROY (1 << 10) /* kfunc implements BPF iter destructor */
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/*
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* Tag marking a kernel function as a kfunc. This is meant to minimize the
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* amount of copy-paste that kfunc authors have to include for correctness so
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* as to avoid issues such as the compiler inlining or eliding either a static
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* kfunc, or a global kfunc in an LTO build.
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*/
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#define __bpf_kfunc __used noinline
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/*
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* Return the name of the passed struct, if exists, or halt the build if for
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* example the structure gets renamed. In this way, developers have to revisit
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* the code using that structure name, and update it accordingly.
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*/
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#define stringify_struct(x) \
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({ BUILD_BUG_ON(sizeof(struct x) < 0); \
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__stringify(x); })
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struct btf;
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struct btf_member;
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struct btf_type;
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union bpf_attr;
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struct btf_show;
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struct btf_id_set;
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struct bpf_prog;
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typedef int (*btf_kfunc_filter_t)(const struct bpf_prog *prog, u32 kfunc_id);
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struct btf_kfunc_id_set {
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struct module *owner;
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struct btf_id_set8 *set;
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btf_kfunc_filter_t filter;
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};
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struct btf_id_dtor_kfunc {
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u32 btf_id;
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u32 kfunc_btf_id;
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};
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struct btf_struct_meta {
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u32 btf_id;
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struct btf_record *record;
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};
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struct btf_struct_metas {
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u32 cnt;
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struct btf_struct_meta types[];
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};
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extern const struct file_operations btf_fops;
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void btf_get(struct btf *btf);
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void btf_put(struct btf *btf);
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int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_sz);
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struct btf *btf_get_by_fd(int fd);
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int btf_get_info_by_fd(const struct btf *btf,
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const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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/* Figure out the size of a type_id. If type_id is a modifier
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* (e.g. const), it will be resolved to find out the type with size.
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*
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* For example:
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* In describing "const void *", type_id is "const" and "const"
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* refers to "void *". The return type will be "void *".
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*
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* If type_id is a simple "int", then return type will be "int".
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*
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* @btf: struct btf object
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* @type_id: Find out the size of type_id. The type_id of the return
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* type is set to *type_id.
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* @ret_size: It can be NULL. If not NULL, the size of the return
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* type is set to *ret_size.
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* Return: The btf_type (resolved to another type with size info if needed).
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* NULL is returned if type_id itself does not have size info
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* (e.g. void) or it cannot be resolved to another type that
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* has size info.
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* *type_id and *ret_size will not be changed in the
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* NULL return case.
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*/
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const struct btf_type *btf_type_id_size(const struct btf *btf,
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u32 *type_id,
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u32 *ret_size);
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/*
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* Options to control show behaviour.
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* - BTF_SHOW_COMPACT: no formatting around type information
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* - BTF_SHOW_NONAME: no struct/union member names/types
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* - BTF_SHOW_PTR_RAW: show raw (unobfuscated) pointer values;
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* equivalent to %px.
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* - BTF_SHOW_ZERO: show zero-valued struct/union members; they
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* are not displayed by default
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* - BTF_SHOW_UNSAFE: skip use of bpf_probe_read() to safely read
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* data before displaying it.
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*/
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#define BTF_SHOW_COMPACT BTF_F_COMPACT
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#define BTF_SHOW_NONAME BTF_F_NONAME
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#define BTF_SHOW_PTR_RAW BTF_F_PTR_RAW
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#define BTF_SHOW_ZERO BTF_F_ZERO
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#define BTF_SHOW_UNSAFE (1ULL << 4)
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void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
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struct seq_file *m);
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int btf_type_seq_show_flags(const struct btf *btf, u32 type_id, void *obj,
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struct seq_file *m, u64 flags);
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/*
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* Copy len bytes of string representation of obj of BTF type_id into buf.
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*
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* @btf: struct btf object
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* @type_id: type id of type obj points to
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* @obj: pointer to typed data
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* @buf: buffer to write to
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* @len: maximum length to write to buf
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* @flags: show options (see above)
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*
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* Return: length that would have been/was copied as per snprintf, or
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* negative error.
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*/
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int btf_type_snprintf_show(const struct btf *btf, u32 type_id, void *obj,
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char *buf, int len, u64 flags);
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int btf_get_fd_by_id(u32 id);
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u32 btf_obj_id(const struct btf *btf);
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bool btf_is_kernel(const struct btf *btf);
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bool btf_is_module(const struct btf *btf);
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struct module *btf_try_get_module(const struct btf *btf);
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u32 btf_nr_types(const struct btf *btf);
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bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s,
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const struct btf_member *m,
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u32 expected_offset, u32 expected_size);
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struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type *t,
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u32 field_mask, u32 value_size);
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int btf_check_and_fixup_fields(const struct btf *btf, struct btf_record *rec);
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bool btf_type_is_void(const struct btf_type *t);
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s32 btf_find_by_name_kind(const struct btf *btf, const char *name, u8 kind);
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s32 bpf_find_btf_id(const char *name, u32 kind, struct btf **btf_p);
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const struct btf_type *btf_type_skip_modifiers(const struct btf *btf,
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u32 id, u32 *res_id);
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const struct btf_type *btf_type_resolve_ptr(const struct btf *btf,
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u32 id, u32 *res_id);
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const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf,
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u32 id, u32 *res_id);
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const struct btf_type *
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btf_resolve_size(const struct btf *btf, const struct btf_type *type,
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u32 *type_size);
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const char *btf_type_str(const struct btf_type *t);
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#define for_each_member(i, struct_type, member) \
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for (i = 0, member = btf_type_member(struct_type); \
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i < btf_type_vlen(struct_type); \
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i++, member++)
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#define for_each_vsi(i, datasec_type, member) \
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for (i = 0, member = btf_type_var_secinfo(datasec_type); \
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i < btf_type_vlen(datasec_type); \
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i++, member++)
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static inline bool btf_type_is_ptr(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_PTR;
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}
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static inline bool btf_type_is_int(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_INT;
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}
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static inline bool btf_type_is_small_int(const struct btf_type *t)
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{
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return btf_type_is_int(t) && t->size <= sizeof(u64);
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}
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static inline u8 btf_int_encoding(const struct btf_type *t)
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{
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return BTF_INT_ENCODING(*(u32 *)(t + 1));
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}
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static inline bool btf_type_is_signed_int(const struct btf_type *t)
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{
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return btf_type_is_int(t) && (btf_int_encoding(t) & BTF_INT_SIGNED);
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}
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static inline bool btf_type_is_enum(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM;
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}
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static inline bool btf_is_any_enum(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_ENUM ||
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BTF_INFO_KIND(t->info) == BTF_KIND_ENUM64;
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}
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static inline bool btf_kind_core_compat(const struct btf_type *t1,
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const struct btf_type *t2)
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{
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return BTF_INFO_KIND(t1->info) == BTF_INFO_KIND(t2->info) ||
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(btf_is_any_enum(t1) && btf_is_any_enum(t2));
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}
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static inline bool str_is_empty(const char *s)
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{
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return !s || !s[0];
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}
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static inline u16 btf_kind(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info);
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}
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static inline bool btf_is_enum(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ENUM;
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}
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static inline bool btf_is_enum64(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ENUM64;
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}
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static inline u64 btf_enum64_value(const struct btf_enum64 *e)
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{
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return ((u64)e->val_hi32 << 32) | e->val_lo32;
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}
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static inline bool btf_is_composite(const struct btf_type *t)
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{
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u16 kind = btf_kind(t);
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return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
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}
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static inline bool btf_is_array(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_ARRAY;
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}
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static inline bool btf_is_int(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_INT;
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}
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static inline bool btf_is_ptr(const struct btf_type *t)
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{
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return btf_kind(t) == BTF_KIND_PTR;
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}
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static inline u8 btf_int_offset(const struct btf_type *t)
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{
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return BTF_INT_OFFSET(*(u32 *)(t + 1));
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}
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static inline bool btf_type_is_scalar(const struct btf_type *t)
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{
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return btf_type_is_int(t) || btf_type_is_enum(t);
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}
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static inline bool btf_type_is_typedef(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_TYPEDEF;
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}
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static inline bool btf_type_is_volatile(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_VOLATILE;
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}
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static inline bool btf_type_is_func(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC;
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}
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static inline bool btf_type_is_func_proto(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_FUNC_PROTO;
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}
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static inline bool btf_type_is_var(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_VAR;
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}
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static inline bool btf_type_is_type_tag(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_TYPE_TAG;
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}
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/* union is only a special case of struct:
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* all its offsetof(member) == 0
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*/
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static inline bool btf_type_is_struct(const struct btf_type *t)
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{
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u8 kind = BTF_INFO_KIND(t->info);
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return kind == BTF_KIND_STRUCT || kind == BTF_KIND_UNION;
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}
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static inline bool __btf_type_is_struct(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_STRUCT;
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}
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static inline bool btf_type_is_array(const struct btf_type *t)
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{
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return BTF_INFO_KIND(t->info) == BTF_KIND_ARRAY;
|
|
}
|
|
|
|
static inline u16 btf_type_vlen(const struct btf_type *t)
|
|
{
|
|
return BTF_INFO_VLEN(t->info);
|
|
}
|
|
|
|
static inline u16 btf_vlen(const struct btf_type *t)
|
|
{
|
|
return btf_type_vlen(t);
|
|
}
|
|
|
|
static inline u16 btf_func_linkage(const struct btf_type *t)
|
|
{
|
|
return BTF_INFO_VLEN(t->info);
|
|
}
|
|
|
|
static inline bool btf_type_kflag(const struct btf_type *t)
|
|
{
|
|
return BTF_INFO_KFLAG(t->info);
|
|
}
|
|
|
|
static inline u32 __btf_member_bit_offset(const struct btf_type *struct_type,
|
|
const struct btf_member *member)
|
|
{
|
|
return btf_type_kflag(struct_type) ? BTF_MEMBER_BIT_OFFSET(member->offset)
|
|
: member->offset;
|
|
}
|
|
|
|
static inline u32 __btf_member_bitfield_size(const struct btf_type *struct_type,
|
|
const struct btf_member *member)
|
|
{
|
|
return btf_type_kflag(struct_type) ? BTF_MEMBER_BITFIELD_SIZE(member->offset)
|
|
: 0;
|
|
}
|
|
|
|
static inline struct btf_member *btf_members(const struct btf_type *t)
|
|
{
|
|
return (struct btf_member *)(t + 1);
|
|
}
|
|
|
|
static inline u32 btf_member_bit_offset(const struct btf_type *t, u32 member_idx)
|
|
{
|
|
const struct btf_member *m = btf_members(t) + member_idx;
|
|
|
|
return __btf_member_bit_offset(t, m);
|
|
}
|
|
|
|
static inline u32 btf_member_bitfield_size(const struct btf_type *t, u32 member_idx)
|
|
{
|
|
const struct btf_member *m = btf_members(t) + member_idx;
|
|
|
|
return __btf_member_bitfield_size(t, m);
|
|
}
|
|
|
|
static inline const struct btf_member *btf_type_member(const struct btf_type *t)
|
|
{
|
|
return (const struct btf_member *)(t + 1);
|
|
}
|
|
|
|
static inline struct btf_array *btf_array(const struct btf_type *t)
|
|
{
|
|
return (struct btf_array *)(t + 1);
|
|
}
|
|
|
|
static inline struct btf_enum *btf_enum(const struct btf_type *t)
|
|
{
|
|
return (struct btf_enum *)(t + 1);
|
|
}
|
|
|
|
static inline struct btf_enum64 *btf_enum64(const struct btf_type *t)
|
|
{
|
|
return (struct btf_enum64 *)(t + 1);
|
|
}
|
|
|
|
static inline const struct btf_var_secinfo *btf_type_var_secinfo(
|
|
const struct btf_type *t)
|
|
{
|
|
return (const struct btf_var_secinfo *)(t + 1);
|
|
}
|
|
|
|
static inline struct btf_param *btf_params(const struct btf_type *t)
|
|
{
|
|
return (struct btf_param *)(t + 1);
|
|
}
|
|
|
|
static inline int btf_id_cmp_func(const void *a, const void *b)
|
|
{
|
|
const int *pa = a, *pb = b;
|
|
|
|
return *pa - *pb;
|
|
}
|
|
|
|
static inline bool btf_id_set_contains(const struct btf_id_set *set, u32 id)
|
|
{
|
|
return bsearch(&id, set->ids, set->cnt, sizeof(u32), btf_id_cmp_func) != NULL;
|
|
}
|
|
|
|
static inline void *btf_id_set8_contains(const struct btf_id_set8 *set, u32 id)
|
|
{
|
|
return bsearch(&id, set->pairs, set->cnt, sizeof(set->pairs[0]), btf_id_cmp_func);
|
|
}
|
|
|
|
struct bpf_verifier_log;
|
|
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);
|
|
const char *btf_name_by_offset(const struct btf *btf, u32 offset);
|
|
struct btf *btf_parse_vmlinux(void);
|
|
struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog);
|
|
u32 *btf_kfunc_id_set_contains(const struct btf *btf, u32 kfunc_btf_id,
|
|
const struct bpf_prog *prog);
|
|
u32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id,
|
|
const struct bpf_prog *prog);
|
|
int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
|
|
const struct btf_kfunc_id_set *s);
|
|
int register_btf_fmodret_id_set(const struct btf_kfunc_id_set *kset);
|
|
s32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id);
|
|
int register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors, u32 add_cnt,
|
|
struct module *owner);
|
|
struct btf_struct_meta *btf_find_struct_meta(const struct btf *btf, u32 btf_id);
|
|
const struct btf_member *
|
|
btf_get_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf,
|
|
const struct btf_type *t, enum bpf_prog_type prog_type,
|
|
int arg);
|
|
int get_kern_ctx_btf_id(struct bpf_verifier_log *log, enum bpf_prog_type prog_type);
|
|
bool btf_types_are_same(const struct btf *btf1, u32 id1,
|
|
const struct btf *btf2, u32 id2);
|
|
#else
|
|
static inline const struct btf_type *btf_type_by_id(const struct btf *btf,
|
|
u32 type_id)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline const char *btf_name_by_offset(const struct btf *btf,
|
|
u32 offset)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline u32 *btf_kfunc_id_set_contains(const struct btf *btf,
|
|
u32 kfunc_btf_id,
|
|
struct bpf_prog *prog)
|
|
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
|
|
const struct btf_kfunc_id_set *s)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline s32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id)
|
|
{
|
|
return -ENOENT;
|
|
}
|
|
static inline int register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors,
|
|
u32 add_cnt, struct module *owner)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline struct btf_struct_meta *btf_find_struct_meta(const struct btf *btf, u32 btf_id)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline const struct btf_member *
|
|
btf_get_prog_ctx_type(struct bpf_verifier_log *log, const struct btf *btf,
|
|
const struct btf_type *t, enum bpf_prog_type prog_type,
|
|
int arg)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline int get_kern_ctx_btf_id(struct bpf_verifier_log *log,
|
|
enum bpf_prog_type prog_type) {
|
|
return -EINVAL;
|
|
}
|
|
static inline bool btf_types_are_same(const struct btf *btf1, u32 id1,
|
|
const struct btf *btf2, u32 id2)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static inline bool btf_type_is_struct_ptr(struct btf *btf, const struct btf_type *t)
|
|
{
|
|
if (!btf_type_is_ptr(t))
|
|
return false;
|
|
|
|
t = btf_type_skip_modifiers(btf, t->type, NULL);
|
|
|
|
return btf_type_is_struct(t);
|
|
}
|
|
|
|
#endif
|