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-rw-r--r--kernel/printk/printk.c37
1 files changed, 22 insertions, 15 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index e3d977bbc7ab..b4d26388bc62 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -585,7 +585,7 @@ static u32 truncate_msg(u16 *text_len, u16 *trunc_msg_len,
}
/* insert record into the buffer, discard old ones, update heads */
-static int log_store(int facility, int level,
+static int log_store(u32 caller_id, int facility, int level,
enum log_flags flags, u64 ts_nsec,
const char *dict, u16 dict_len,
const char *text, u16 text_len)
@@ -634,10 +634,7 @@ static int log_store(int facility, int level,
else
msg->ts_nsec = local_clock();
#ifdef CONFIG_PRINTK_CALLER
- if (in_task())
- msg->caller_id = task_pid_nr(current);
- else
- msg->caller_id = 0x80000000 + raw_smp_processor_id();
+ msg->caller_id = caller_id;
#endif
memset(log_dict(msg) + dict_len, 0, pad_len);
msg->len = size;
@@ -1800,6 +1797,12 @@ static inline void printk_delay(void)
}
}
+static inline u32 printk_caller_id(void)
+{
+ return in_task() ? task_pid_nr(current) :
+ 0x80000000 + raw_smp_processor_id();
+}
+
/*
* Continuation lines are buffered, and not committed to the record buffer
* until the line is complete, or a race forces it. The line fragments
@@ -1809,7 +1812,7 @@ static inline void printk_delay(void)
static struct cont {
char buf[LOG_LINE_MAX];
size_t len; /* length == 0 means unused buffer */
- struct task_struct *owner; /* task of first print*/
+ u32 caller_id; /* printk_caller_id() of first print */
u64 ts_nsec; /* time of first print */
u8 level; /* log level of first message */
u8 facility; /* log facility of first message */
@@ -1821,12 +1824,13 @@ static void cont_flush(void)
if (cont.len == 0)
return;
- log_store(cont.facility, cont.level, cont.flags, cont.ts_nsec,
- NULL, 0, cont.buf, cont.len);
+ log_store(cont.caller_id, cont.facility, cont.level, cont.flags,
+ cont.ts_nsec, NULL, 0, cont.buf, cont.len);
cont.len = 0;
}
-static bool cont_add(int facility, int level, enum log_flags flags, const char *text, size_t len)
+static bool cont_add(u32 caller_id, int facility, int level,
+ enum log_flags flags, const char *text, size_t len)
{
/* If the line gets too long, split it up in separate records. */
if (cont.len + len > sizeof(cont.buf)) {
@@ -1837,7 +1841,7 @@ static bool cont_add(int facility, int level, enum log_flags flags, const char *
if (!cont.len) {
cont.facility = facility;
cont.level = level;
- cont.owner = current;
+ cont.caller_id = caller_id;
cont.ts_nsec = local_clock();
cont.flags = flags;
}
@@ -1857,13 +1861,15 @@ static bool cont_add(int facility, int level, enum log_flags flags, const char *
static size_t log_output(int facility, int level, enum log_flags lflags, const char *dict, size_t dictlen, char *text, size_t text_len)
{
+ const u32 caller_id = printk_caller_id();
+
/*
* If an earlier line was buffered, and we're a continuation
- * write from the same process, try to add it to the buffer.
+ * write from the same context, try to add it to the buffer.
*/
if (cont.len) {
- if (cont.owner == current && (lflags & LOG_CONT)) {
- if (cont_add(facility, level, lflags, text, text_len))
+ if (cont.caller_id == caller_id && (lflags & LOG_CONT)) {
+ if (cont_add(caller_id, facility, level, lflags, text, text_len))
return text_len;
}
/* Otherwise, make sure it's flushed */
@@ -1876,12 +1882,13 @@ static size_t log_output(int facility, int level, enum log_flags lflags, const c
/* If it doesn't end in a newline, try to buffer the current line */
if (!(lflags & LOG_NEWLINE)) {
- if (cont_add(facility, level, lflags, text, text_len))
+ if (cont_add(caller_id, facility, level, lflags, text, text_len))
return text_len;
}
/* Store it in the record log */
- return log_store(facility, level, lflags, 0, dict, dictlen, text, text_len);
+ return log_store(caller_id, facility, level, lflags, 0,
+ dict, dictlen, text, text_len);
}
/* Must be called under logbuf_lock. */