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bpf: Clarify a bpf_bprintf_prepare macro 

The per-cpu buffers contain bprintf data rather than printf arguments.
The macro name and comment were a bit confusing, this rewords them in a
clearer way.

Signed-off-by: Florent Revest <revest@chromium.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20210517092830.1026418-1-revest@chromium.org
This commit is contained in:
Florent Revest 2021-05-17 11:28:29 +02:00 committed by Daniel Borkmann
parent 704e2beba2
commit 8afcc19fbf
1 changed files with 5 additions and 4 deletions
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9
kernel/bpf/helpers.c
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@ -692,13 +692,14 @@ static int bpf_trace_copy_string(char *buf, void *unsafe_ptr, char fmt_ptype,
return -EINVAL;
}
/* Per-cpu temp buffers which can be used by printf-like helpers for %s or %p
/* Per-cpu temp buffers used by printf-like helpers to store the bprintf binary
* arguments representation.
*/
#define MAX_PRINTF_BUF_LEN 512
#define MAX_BPRINTF_BUF_LEN 512
/* Support executing three nested bprintf helper calls on a given CPU */
struct bpf_bprintf_buffers {
char tmp_bufs[3][MAX_PRINTF_BUF_LEN];
char tmp_bufs[3][MAX_BPRINTF_BUF_LEN];
};
static DEFINE_PER_CPU(struct bpf_bprintf_buffers, bpf_bprintf_bufs);
static DEFINE_PER_CPU(int, bpf_bprintf_nest_level);
@ -761,7 +762,7 @@ int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
if (num_args && try_get_fmt_tmp_buf(&tmp_buf))
return -EBUSY;
tmp_buf_end = tmp_buf + MAX_PRINTF_BUF_LEN;
tmp_buf_end = tmp_buf + MAX_BPRINTF_BUF_LEN;
*bin_args = (u32 *)tmp_buf;
}