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From: "Kirill A. Shutemov" <k.shutemov@velesys.com>
To: ALT Linux Team development discussions <devel@lists.altlinux.org>
Subject: Re: [devel] asm/page.h
Date: Tue, 19 Feb 2008 14:42:40 +0200
Message-ID: <20080219124240.GB7792@localhost.localdomain> (raw)
In-Reply-To: <20080219014945.GB9733@wo.int.altlinux.org>

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On [Tue, 19.02.2008 04:49], Dmitry V. Levin wrote:
> On Tue, Feb 19, 2008 at 03:40:41AM +0300, Kirill Maslinsky wrote:
> > On Tue, Feb 19, 2008 at 02:23:41AM +0200, Led wrote:
> > > Tuesday, 19 February 2008 02:18:11 Kirill Maslinsky написав:
> > 
> > [...]
> > 
> > > > -               if (size > PAGE_SIZE)
> > > > -                       bulk.len = PAGE_SIZE;
> > > > +               if (size > sysconf(_SC_PAGESIZE))
> > > > +                       bulk.len = sysconf(_SC_PAGESIZE);
> > 
> > > Зачем дважды вызывать? ИМХО лучше завести переменную page_size.
> > 
> > Логично. Вот так будет корректно?
> > 
> > --- a/eciadsl-usermode/pusb-linux.c
> > +++ b/eciadsl-usermode/pusb-linux.c
> > @@ -29,7 +29,6 @@
> >  #include <string.h>
> >  
> >  #include "pusb-linux.h"
> > -#include <asm/page.h>
> >  
> >  #include "pusb.h"
> >  
> > @@ -431,6 +430,7 @@ inline int pusb_endpoint_rw(int fd, int ep, unsigned char* buf, int size, int ti
> >         static struct usbdevfs_bulktransfer bulk;
> >         static int ret;
> >         int received = 0;
> > +       int page_size = sysconf(_SC_PAGESIZE);
> >  
> >         do
> >         {
> > @@ -438,8 +438,8 @@ inline int pusb_endpoint_rw(int fd, int ep, unsigned char* buf, int size, int ti
> >  
> >                 bulk.len = size;
> >  
> > -               if (size > PAGE_SIZE)
> > -                       bulk.len = PAGE_SIZE;
> > +               if (size > page_size)
> > +                       bulk.len = page_size;
> >  
> > Вы меня простите за тупые вопросы, я просто этого языка (C) вообще не знаю, 
> > опасаюсь напортачить. 
> 
> Код синтаксически корректный, но upstream может захотеть соптимизировать
> количество вызовов sysconf.

А проверить возвращаемое из sysconf значение не нужно? А то мало ли что...

-- 
Regards,  Kirill A. Shutemov
 + Belarus, Minsk
 + Velesys Ltd, http://www.velesys.com/
 + ALT Linux Team, http://www.altlinux.com/

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  reply	other threads:[~2008-02-19 12:42 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-18 21:09 ` [devel] xawtv4-4.0-alt3.cvs20070625.2: i586 rebuild failed Hihin Ruslan
2008-02-18 21:40   ` [devel] asm/page.h Dmitry V. Levin
2008-02-18 22:38     ` Kirill Maslinsky
2008-02-18 23:42       ` Led
2008-02-18 23:45         ` Led
2008-02-19  0:06           ` Dmitry V. Levin
2008-02-19  0:18             ` Kirill Maslinsky
2008-02-19  0:23               ` Led
2008-02-19  0:40                 ` Kirill Maslinsky
2008-02-19  0:55                   ` Led
2008-02-19  1:49                   ` Dmitry V. Levin
2008-02-19 12:42                     ` Kirill A. Shutemov [this message]
2008-02-19 12:43                       ` Mikhail Gusarov
2008-02-20  4:54                     ` Ildar Mulyukov
2008-02-20 14:33                       ` Kirill Maslinsky
2008-02-19  9:43                   ` Slava Semushin
2008-02-19  1:48               ` Dmitry V. Levin
2008-02-19 15:03                 ` Led
2008-02-19  0:11           ` Kirill Maslinsky
2008-02-19  0:22             ` Led
2008-02-19 12:35             ` Kirill A. Shutemov

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