Re: Fwd: [PATCH] Pageset Localization V2

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The goal here is to replace the head of a existing list pointed to by
'list' with a new head pointed to by 'nlist'. 
First there is a memcpy that copies the contents of list to nlist then
this macro is called.
The macro makes sure that if the old head was empty then INIT_LIST_HEAD
the 'nlist', if not then make sure that the nodes before and after the
head now correclty point to nlist instead of list.

regards
shobhit


> ---------- Forwarded message ----------
> From: Christoph Hellwig <[email protected]>
> Date: Wed, 30 Mar 2005 12:14:39 +0100
> Subject: Re: [PATCH] Pageset Localization V2
> To: Christoph Lameter <[email protected]>
> Cc: Manfred Spraul <[email protected]>, Andrew Morton
> <[email protected]>, [email protected],
> [email protected], [email protected], [email protected]
> 
> 
> > +#define MAKE_LIST(list, nlist)  \
> > +     do {    \
> > +             if(list_empty(&list))      \
> > +                     INIT_LIST_HEAD(nlist);          \
> > +             else {  nlist->next->prev = nlist;      \
> > +                     nlist->prev->next = nlist;      \
> > +             }                                       \
> > +     }while(0)
> 
> This is horrible.  Where are the nlist pointers supposed to point to?
> What's so magic you need the INIT_LIST_HEAD only conditionally?
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux