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ftrace: fix trace_output

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Impact: fix bug for handling partial line

trace_seq_printf(), seq_print_userip_objs(), ... return
0          -- partial line was written
other(>0)  -- success

duplicate output is also removed in trace_print_raw().

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Lai Jiangshan 2009-01-15 18:05:40 +08:00 committed by Ingo Molnar
parent 55922173f1
commit 6c1a99afbd
2 changed files with 33 additions and 36 deletions
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65
kernel/trace/trace_output.c
View File

@ -440,9 +440,9 @@ trace_fn_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
trace_assign_type(field, entry);
if (trace_seq_printf(s, "%x %x\n",
field->ip,
field->parent_ip))
if (!trace_seq_printf(s, "%x %x\n",
field->ip,
field->parent_ip))
return TRACE_TYPE_PARTIAL_LINE;
return 0;
@ -497,14 +497,14 @@ trace_ctxwake_print(struct trace_seq *s, struct trace_entry *entry, int flags,
T = task_state_char(field->next_state);
S = task_state_char(field->prev_state);
comm = trace_find_cmdline(field->next_pid);
if (trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
field->prev_pid,
field->prev_prio,
S, delim,
field->next_cpu,
field->next_pid,
field->next_prio,
T, comm))
if (!trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
field->prev_pid,
field->prev_prio,
S, delim,
field->next_cpu,
field->next_pid,
field->next_prio,
T, comm))
return TRACE_TYPE_PARTIAL_LINE;
return 0;
@ -534,14 +534,14 @@ trace_ctxwake_raw(struct trace_seq *s, struct trace_entry *entry, int flags,
if (!S)
task_state_char(field->prev_state);
T = task_state_char(field->next_state);
if (trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
field->prev_pid,
field->prev_prio,
S,
field->next_cpu,
field->next_pid,
field->next_prio,
T))
if (!trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
field->prev_pid,
field->prev_prio,
S,
field->next_cpu,
field->next_pid,
field->next_prio,
T))
return TRACE_TYPE_PARTIAL_LINE;
return 0;
@ -639,10 +639,10 @@ trace_special_print(struct trace_seq *s, struct trace_entry *entry, int flags)
trace_assign_type(field, entry);
if (trace_seq_printf(s, "# %ld %ld %ld\n",
field->arg1,
field->arg2,
field->arg3))
if (!trace_seq_printf(s, "# %ld %ld %ld\n",
field->arg1,
field->arg2,
field->arg3))
return TRACE_TYPE_PARTIAL_LINE;
return 0;
@ -697,13 +697,13 @@ trace_stack_print(struct trace_seq *s, struct trace_entry *entry, int flags)
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
if (i) {
if (trace_seq_puts(s, " <= "))
if (!trace_seq_puts(s, " <= "))
goto partial;
if (seq_print_ip_sym(s, field->caller[i], flags))
if (!seq_print_ip_sym(s, field->caller[i], flags))
goto partial;
}
if (trace_seq_puts(s, "\n"))
if (!trace_seq_puts(s, "\n"))
goto partial;
}
@ -731,10 +731,10 @@ trace_user_stack_print(struct trace_seq *s, struct trace_entry *entry,
trace_assign_type(field, entry);
if (seq_print_userip_objs(field, s, flags))
if (!seq_print_userip_objs(field, s, flags))
goto partial;
if (trace_seq_putc(s, '\n'))
if (!trace_seq_putc(s, '\n'))
goto partial;
return 0;
@ -760,10 +760,10 @@ trace_print_print(struct trace_seq *s, struct trace_entry *entry, int flags)
trace_assign_type(field, entry);
if (seq_print_ip_sym(s, field->ip, flags))
if (!seq_print_ip_sym(s, field->ip, flags))
goto partial;
if (trace_seq_printf(s, ": %s", field->buf))
if (!trace_seq_printf(s, ": %s", field->buf))
goto partial;
return 0;
@ -779,10 +779,7 @@ trace_print_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
trace_assign_type(field, entry);
if (seq_print_ip_sym(s, field->ip, flags))
goto partial;
if (trace_seq_printf(s, "# %lx %s", field->ip, field->buf))
if (!trace_seq_printf(s, "# %lx %s", field->ip, field->buf))
goto partial;
return 0;

4
kernel/trace/trace_output.h
View File

@ -45,14 +45,14 @@ trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags);
#define SEQ_PUT_FIELD_RET(s, x) \
do { \
if (!trace_seq_putmem(s, &(x), sizeof(x))) \
return 0; \
return TRACE_TYPE_PARTIAL_LINE; \
} while (0)
#define SEQ_PUT_HEX_FIELD_RET(s, x) \
do { \
BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
return 0; \
return TRACE_TYPE_PARTIAL_LINE; \
} while (0)
#endif