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SubjectRe: [PATCH 11/11 re-post] dynamic_debug: use a single printk() to emit msgs
On Fri, Jul 15, 2011 at 04:46:31PM -0700, Joe Perches wrote:
> On Fri, 2011-07-15 at 15:59 -0400, Jason Baron wrote:
> > here's Bart's suggestion as re-post. It looks much cleaner to
> > me...
> []
> > diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
> []
> > @@ -422,52 +422,46 @@ static int ddebug_exec_query(char *query_string)
> > return 0;
> > }
> >
> > -static int dynamic_emit_prefix(const struct _ddebug *descriptor)
> > +#define PREFIX_SIZE 64
> > +#define LEFT(wrote) ((PREFIX_SIZE - wrote) > 0) ? (PREFIX_SIZE - wrote) : 0
> > +
> > +static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
> > {
> > - char tid[sizeof(int) + sizeof(int)/2 + 4];
> > - char lineno[sizeof(int) + sizeof(int)/2];
> > + int pos = 0;
> >
> > - if (descriptor->flags & _DPRINTK_FLAGS_INCL_TID) {
> > + pos += snprintf(buf + pos, LEFT(pos), "%s", KERN_DEBUG);
> > + if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
> > if (in_interrupt())
> > - snprintf(tid, sizeof(tid), "%s", "<intr> ");
> > + pos += snprintf(buf + pos, LEFT(pos), "%s ",
> > + "<intr>");
>
> scnprintf works without using LEFT.
> snprintf does as well.
>
> http://lkml.org/lkml/2010/7/23/375
>

So you're saying, just pass (PREFIX_SIZE - pos), as the second argument? I see
kernel code written both ways. I think it's fine as written, unless you feel
strongly about this.

thanks,

-Jason


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