Re: [PATCH for -tip] irq: for_each_irq_desc() makes simplify

[Cyrill Gorcunov <gorcunov@gmail.com>]

[KOSAKI Motohiro - Thu, Dec 25, 2008 at 10:45:20PM +0900]
| > [KOSAKI Motohiro - Thu, Dec 25, 2008 at 09:41:54PM +0900]
| > ...
| > | Is this good idea?
| > | this patch also tested on above three architecture.
| > |
| > |
| > | ===
| > | Subject: [PATCH] irq: for_each_irq_desc() makes simplify
| > | Impact: cleanup
| > |
| > | all for_each_irq_desc() usage point have !desc check.
| > | then its check can move into for_each_irq_desc() macro.
| > |
| > |
| > | Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
| > | CC: Yinghai Lu <yinghai@kernel.org>
| > | CC: Ingo Molnar <mingo@elte.hu>
| > | ---
| > |  arch/x86/kernel/io_apic.c |   10 ----------
| > |  drivers/xen/events.c      |    3 ---
| > |  fs/proc/stat.c            |    3 ---
| > |  include/linux/irqnr.h     |    6 ++++--
| > |  kernel/irq/autoprobe.c    |   15 ---------------
| > |  kernel/irq/handle.c       |    3 ---
| > |  kernel/irq/spurious.c     |    5 -----
| > |  7 files changed, 4 insertions(+), 41 deletions(-)
| > ...
| >
| > Hi Kosaki,
| >
| > the idea is that good indeed but I wonder if it possible
| > to explain that we skip empty 'desk' in for_each_... name
| > itself. Maybe for_each_irq_desc_defined :) Or something
| > more convenient word instead of "defined"?
| 
| "if (!desc) " mean this irqno don't have irq description.
| so I think this name imply mean skipping no irq desctiption element.
| 
| Actually, on CONFIG_SPARSEIRQ, desc is filled in dynamically after booting.
| then "defined" is a bit misleading word.
| 

So if I would need to iterate over all descriptors including empty
I need to type all this long for(;;) form again? For me for_each_irq_desc
implies to iterate over each irq_desc allocated regardles of internal
descriptor data. For example in list_struct we have a special test if
entry is empty or not. So I think hiding details is not that good (and
that is why I was asking for more descriptive macro name). BUT if it
really supposed to behave like that then I don't object :)

		- Cyrill -