Move the static buffers from send_msg_no_fragmentation() and send_msg_fragmented() into the netconsole_target structure. This simplifies the code by: - Eliminating redundant static buffers - Centralizing buffer management in the target structure - Reducing memory usage by 1KB (one buffer instead of two)
The buffer in netconsole_target is protected by target_list_lock, maintaining the same synchronization semantics as the original code.
Suggested-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Breno Leitao leitao@debian.org Reviewed-by: Simon Horman horms@kernel.org --- drivers/net/netconsole.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 86ab4a42769a49eebe5dd6f01dafafc6c86ec54f..034caaa26563504357f859000678af2037003c25 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -123,6 +123,7 @@ struct netconsole_target_stats { * remote_ip (read-write) * local_mac (read-only) * remote_mac (read-write) + * @buf: The buffer used to send the full msg to the network stack */ struct netconsole_target { struct list_head list; @@ -137,6 +138,8 @@ struct netconsole_target { bool extended; bool release; struct netpoll np; + /* protected by target_list_lock */ + char buf[MAX_PRINT_CHUNK]; };
#ifdef CONFIG_NETCONSOLE_DYNAMIC @@ -1117,7 +1120,6 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt, int msg_len, int release_len) { - static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */ const char *userdata = NULL; const char *release;
@@ -1128,18 +1130,18 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt, if (release_len) { release = init_utsname()->release;
- scnprintf(buf, MAX_PRINT_CHUNK, "%s,%s", release, msg); + scnprintf(nt->buf, MAX_PRINT_CHUNK, "%s,%s", release, msg); msg_len += release_len; } else { - memcpy(buf, msg, msg_len); + memcpy(nt->buf, msg, msg_len); }
if (userdata) - msg_len += scnprintf(&buf[msg_len], + msg_len += scnprintf(&nt->buf[msg_len], MAX_PRINT_CHUNK - msg_len, "%s", userdata);
- send_udp(nt, buf, msg_len); + send_udp(nt, nt->buf, msg_len); }
static void append_release(char *buf) @@ -1150,7 +1152,7 @@ static void append_release(char *buf) scnprintf(buf, MAX_PRINT_CHUNK, "%s,", release); }
-static void send_fragmented_body(struct netconsole_target *nt, char *buf, +static void send_fragmented_body(struct netconsole_target *nt, const char *msgbody, int header_len, int msgbody_len) { @@ -1181,7 +1183,7 @@ static void send_fragmented_body(struct netconsole_target *nt, char *buf, int this_offset = 0; int this_chunk = 0;
- this_header += scnprintf(buf + this_header, + this_header += scnprintf(nt->buf + this_header, MAX_PRINT_CHUNK - this_header, ",ncfrag=%d/%d;", offset, body_len); @@ -1192,7 +1194,8 @@ static void send_fragmented_body(struct netconsole_target *nt, char *buf, MAX_PRINT_CHUNK - this_header); if (WARN_ON_ONCE(this_chunk <= 0)) return; - memcpy(buf + this_header, msgbody + offset, this_chunk); + memcpy(nt->buf + this_header, msgbody + offset, + this_chunk); this_offset += this_chunk; }
@@ -1226,13 +1229,13 @@ static void send_fragmented_body(struct netconsole_target *nt, char *buf, */ return;
- memcpy(buf + this_header + this_offset, + memcpy(nt->buf + this_header + this_offset, userdata + sent_userdata, this_chunk); this_offset += this_chunk; }
- send_udp(nt, buf, this_header + this_offset); + send_udp(nt, nt->buf, this_header + this_offset); offset += this_offset; } } @@ -1242,7 +1245,6 @@ static void send_msg_fragmented(struct netconsole_target *nt, int msg_len, int release_len) { - static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */ int header_len, msgbody_len; const char *msgbody;
@@ -1260,16 +1262,16 @@ static void send_msg_fragmented(struct netconsole_target *nt, * "ncfrag=<byte-offset>/<total-bytes>" */ if (release_len) - append_release(buf); + append_release(nt->buf);
/* Copy the header into the buffer */ - memcpy(buf + release_len, msg, header_len); + memcpy(nt->buf + release_len, msg, header_len); header_len += release_len;
/* for now on, the header will be persisted, and the msgbody * will be replaced */ - send_fragmented_body(nt, buf, msgbody, header_len, msgbody_len); + send_fragmented_body(nt, msgbody, header_len, msgbody_len); }
/**