On Sun, 22 Oct 2006 19:36:04 -0600 Matthew Wilcox wrote:
> On Mon, Oct 23, 2006 at 03:31:16AM +0200, Andi Kleen wrote:
> > On Monday 23 October 2006 03:08, Matthew Wilcox wrote:
> > > On Mon, Oct 23, 2006 at 02:42:58AM +0200, Andi Kleen wrote:
> > > >
> > > > > /*+
> > > > > * Provides: struct sched
> > > > > * Provides: total_forks, nr_threads, process_counts, nr_processes()
> > > > > * Provides: nr_running(), nr_uninterruptible(), nr_active(), nr_iowait(), weighted_cpuload()
> > > > > */
> > > >
> > > > That's ugly. If it needs that i don't think it's a good idea.
> > > > We really want standard C, not some Linux dialect.
> > >
> > > Um, that's a comment. It's standard C.
> >
> > If you require it to do something it isn't a comment anymore -- it would become
> > a language extension.
>
> How is this any different from __iomem annotations?
>
> > > Here's the problem. If a file needs canonicalize_irq(), it should
> > > include <linux/interrupt.h> (which eventually ends up including
> > > asm/irq,h), and not <asm/irq.h> (where it's defined).
> > > If a file needs add_wait_queue(), it should include <linux/wait.h>
> > > (where it's defined) and not <linux/fs.h> (which directly includes
> > > linux/wait.h>.
> > >
> > > Please define an algorithm which distinguishes the two cases.
> >
> > Needs are inside {} or in a macro definition
> > So if the identifier happens after #define or inside {} assume the symbol
> > is needed from somewhere else, otherwise it is declared here.
> >
> > That is likely not 100% foolproof, but should be good enough and
> > the mismatches can be resolved by hand.
>
> Let me try to explain the problem again, because what you wrote has
> nothing to do with the problem.
>
> canonicalize_irq() is defined in <asm/irq.h>. No .c file should be
> including <asm/irq.h> in order to get it. It should be including
> <linux/interrupt.h>, which will indirectly pull in <asm/irq.h>
We can add #error or #warning to asm/irq.h when that is done &
detected hence caught and will be fixed.
Don't we already have a few like that? ("don't include this file
directly") I looked quickly but didn't see them...
> add_wait_queue() is defined in <linux/wait.h>. .c files wishing to use
> add_wait_queue() should be including <linux/wait.h> rather than relying
> on it being pulled in through some other path.
>
> This needs annotations to fix, or a big bag of unreliable heuristics.
---
~Randy
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