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bpf: sync bpf.h to tools/ 

Fix a 'struct pt_reg' typo and clarify when bpf_trace_printk discards
lines. Affects documentation only.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Peter Wu 2019-08-21 00:09:00 +01:00 committed by Alexei Starovoitov
parent 55c33dfbeb
commit 1f8919b170
1 changed files with 5 additions and 3 deletions
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8
tools/include/uapi/linux/bpf.h
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@ -580,6 +580,8 @@ union bpf_attr {
* limited to five).
*
* Each time the helper is called, it appends a line to the trace.
* Lines are discarded while *\/sys/kernel/debug/tracing/trace* is
* open, use *\/sys/kernel/debug/tracing/trace_pipe* to avoid this.
* The format of the trace is customizable, and the exact output
* one will get depends on the options set in
* *\/sys/kernel/debug/tracing/trace_options* (see also the
@ -1018,7 +1020,7 @@ union bpf_attr {
* The realm of the route for the packet associated to *skb*, or 0
* if none was found.
*
* int bpf_perf_event_output(struct pt_reg *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
* int bpf_perf_event_output(struct pt_regs *ctx, struct bpf_map *map, u64 flags, void *data, u64 size)
* Description
* Write raw *data* blob into a special BPF perf event held by
* *map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
@ -1080,7 +1082,7 @@ union bpf_attr {
* Return
* 0 on success, or a negative error in case of failure.
*
* int bpf_get_stackid(struct pt_reg *ctx, struct bpf_map *map, u64 flags)
* int bpf_get_stackid(struct pt_regs *ctx, struct bpf_map *map, u64 flags)
* Description
* Walk a user or a kernel stack and return its id. To achieve
* this, the helper needs *ctx*, which is a pointer to the context
@ -1729,7 +1731,7 @@ union bpf_attr {
* Return
* 0 on success, or a negative error in case of failure.
*
* int bpf_override_return(struct pt_reg *regs, u64 rc)
* int bpf_override_return(struct pt_regs *regs, u64 rc)
* Description
* Used for error injection, this helper uses kprobes to override
* the return value of the probed function, and to set it to *rc*.