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tracing: Do not use signed enums with unsigned long long in fgragh output 

The duration field of print_graph_duration() can also be used
to do the space filling by passing an enum in it:

  DURATION_FILL_FULL
  DURATION_FILL_START
  DURATION_FILL_END

The problem is that these are enums and defined as negative,
but the duration field is unsigned long long. Most archs are
fine with this but blackfin fails to compile because of it:

kernel/built-in.o: In function `print_graph_duration':
kernel/trace/trace_functions_graph.c:782: undefined reference to `__ucmpdi2'

Overloading a unsigned long long with an signed enum is just
bad in principle. We can accomplish the same thing by using
part of the flags field instead.

Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-11-06 14:50:06 -05:00 committed by Steven Rostedt
parent 042b10d83d
commit 6fc84ea70e
2 changed files with 13 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/trace/trace.h
View File

@ -712,6 +712,8 @@ extern unsigned long trace_flags;
#define TRACE_GRAPH_PRINT_PROC 0x8
#define TRACE_GRAPH_PRINT_DURATION 0x10
#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
extern enum print_line_t
print_graph_function_flags(struct trace_iterator *iter, u32 flags);

22
kernel/trace/trace_functions_graph.c
View File

@ -82,9 +82,9 @@ static struct trace_array *graph_array;
* to fill in space into DURATION column.
*/
enum {
DURATION_FILL_FULL = -1,
DURATION_FILL_START = -2,
DURATION_FILL_END = -3,
FLAGS_FILL_FULL = 1 << TRACE_GRAPH_PRINT_FILL_SHIFT,
FLAGS_FILL_START = 2 << TRACE_GRAPH_PRINT_FILL_SHIFT,
FLAGS_FILL_END = 3 << TRACE_GRAPH_PRINT_FILL_SHIFT,
};
static enum print_line_t
@ -702,7 +702,7 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
}
/* No overhead */
ret = print_graph_duration(DURATION_FILL_START, s, flags);
ret = print_graph_duration(0, s, flags | FLAGS_FILL_START);
if (ret != TRACE_TYPE_HANDLED)
return ret;
@ -714,7 +714,7 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
ret = print_graph_duration(DURATION_FILL_END, s, flags);
ret = print_graph_duration(0, s, flags | FLAGS_FILL_END);
if (ret != TRACE_TYPE_HANDLED)
return ret;
@ -779,14 +779,14 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s,
return TRACE_TYPE_HANDLED;
/* No real adata, just filling the column with spaces */
switch (duration) {
case DURATION_FILL_FULL:
switch (flags & TRACE_GRAPH_PRINT_FILL_MASK) {
case FLAGS_FILL_FULL:
ret = trace_seq_puts(s, " | ");
return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
case DURATION_FILL_START:
case FLAGS_FILL_START:
ret = trace_seq_puts(s, " ");
return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
case DURATION_FILL_END:
case FLAGS_FILL_END:
ret = trace_seq_puts(s, " |");
return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
}
@ -902,7 +902,7 @@ print_graph_entry_nested(struct trace_iterator *iter,
}
/* No time */
ret = print_graph_duration(DURATION_FILL_FULL, s, flags);
ret = print_graph_duration(0, s, flags | FLAGS_FILL_FULL);
if (ret != TRACE_TYPE_HANDLED)
return ret;
@ -1222,7 +1222,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
return TRACE_TYPE_PARTIAL_LINE;
/* No time */
ret = print_graph_duration(DURATION_FILL_FULL, s, flags);
ret = print_graph_duration(0, s, flags | FLAGS_FILL_FULL);
if (ret != TRACE_TYPE_HANDLED)
return ret;