Re: [PATCH] lib/vsprintf: add %pT[C012] format specifier
From: Joe Perches
Date: Sat Dec 28 2013 - 15:25:41 EST
On Sat, 2013-12-28 at 12:08 -0800, Andrew Morton wrote:
> On Sat, 28 Dec 2013 11:53:25 -0800 Joe Perches <joe@xxxxxxxxxxx> wrote:
> > > > #define PRINTK_PID "\002"
> > > > #define PRINTK_TASK_ID "\003" /* "comm:pid" */
> > > >
> > > > printk(PRINTK_TASK_ID ": hair on fire\n");
> > > >
> > > > It's certainly compact. I doubt if there's any existing code which
> > > > deliberately prints control chars?
> > >
> > > But the rest looks OK to me.
> > Tell me again, what's wrong with using p or current?
> > printk("%pt", current);
> Nothing much. It's just that all these callsites are generating the
> code to pass an argument which the callee already has access to.
> Optimizing that will reduce text size a bit.
There have been smaller reductions in code size
> There's also the matter of providing a standard and abstracted way of
> representing a task, instead of directly accessing its ->comm. But
> that's a separate thing from new printk tokens.
OK then perhaps use KERN_<ATTR> or CURRENT_<ATTR>
rather than PRINTK_<ATTR>
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