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| author | Joe Perches <joe@perches.com> | 2011-08-11 14:36:29 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-22 18:23:04 -0700 |
| commit | 5b2ebce4821c66dd33d15d076ee264b4eb86fea3 (patch) | |
| tree | 4d5aeb3c6a78a1ddf4cf7a59faca3d67be859180 | |
| parent | 6c2140ee0ebf91258f93d3019922b5f520a18d88 (diff) | |
| download | linux-5b2ebce4821c66dd33d15d076ee264b4eb86fea3.tar.bz2 | |
dynamic_debug: Remove uses of KERN_CONT in dynamic_emit_prefix
Multiple printks with KERN_CONT can be interleaved by
other printks. Reduce the likelihood of that interleaving
by consolidating multiple calls to printk.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | lib/dynamic_debug.c | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 37217090aacf..a3eb6ab074a6 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -430,23 +430,35 @@ static int ddebug_exec_query(char *query_string) static int dynamic_emit_prefix(const struct _ddebug *descriptor) { - int res; + char tid[sizeof(int) + sizeof(int)/2 + 4]; + char lineno[sizeof(int) + sizeof(int)/2]; - res = printk(KERN_DEBUG); if (descriptor->flags & _DPRINTK_FLAGS_INCL_TID) { if (in_interrupt()) - res += printk(KERN_CONT "<intr> "); + snprintf(tid, sizeof(tid), "%s", "<intr> "); else - res += printk(KERN_CONT "[%d] ", task_pid_vnr(current)); + snprintf(tid, sizeof(tid), "[%d] ", + task_pid_vnr(current)); + } else { + tid[0] = 0; } - if (descriptor->flags & _DPRINTK_FLAGS_INCL_MODNAME) - res += printk(KERN_CONT "%s:", descriptor->modname); - if (descriptor->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) - res += printk(KERN_CONT "%s:", descriptor->function); - if (descriptor->flags & _DPRINTK_FLAGS_INCL_LINENO) - res += printk(KERN_CONT "%d ", descriptor->lineno); - return res; + if (descriptor->flags & _DPRINTK_FLAGS_INCL_LINENO) + snprintf(lineno, sizeof(lineno), "%d", descriptor->lineno); + else + lineno[0] = 0; + + return printk(KERN_DEBUG "%s%s%s%s%s%s", + tid, + (descriptor->flags & _DPRINTK_FLAGS_INCL_MODNAME) ? + descriptor->modname : "", + (descriptor->flags & _DPRINTK_FLAGS_INCL_MODNAME) ? + ":" : "", + (descriptor->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) ? + descriptor->function : "", + (descriptor->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) ? + ":" : "", + lineno); } int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |