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SubjectRe: [PATCH] mm: make reserve_bootmem can crossed the nodes
On Thu, Mar 13, 2008 at 6:55 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@jp.fujitsu.com> wrote:
> On Thu, 13 Mar 2008 18:35:51 -0700
>
> "Yinghai Lu" <yhlu.kernel@gmail.com> wrote:
>
> > On Thu, Mar 13, 2008 at 6:34 PM, KAMEZAWA Hiroyuki
> > <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> > > On Thu, 13 Mar 2008 16:45:42 -0700
> > > "Yinghai Lu" <yhlu.kernel@gmail.com> wrote:
> > > > int __init reserve_bootmem(unsigned long addr, unsigned long size,
> > > > int flags)
> > > > {
> > > > - return reserve_bootmem_core(NODE_DATA(0)->bdata, addr, size, flags);
> > > > + int ret;
> > > > + bootmem_data_t *bdata;
> > > > + list_for_each_entry(bdata, &bdata_list, list) {
> > > > + ret = can_reserve_bootmem_core(bdata, addr, size, flags);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > + }
> > > > + list_for_each_entry(bdata, &bdata_list, list)
> > > > + reserve_bootmem_core(bdata, addr, size, flags);
> > > > + return 0;
> > > > }
> > >
> > > why list_for_each twice ?
> >
> > first_for_each only check if we can reserve that.
> > second will do the reserve job.
> >
> Hmm, can a call to reserve_bootmem() return a memory region which spread across
> prural nodes ?

Yes. there is one reserve_bootmem in reserve_crashkernel. and position
is passed via commandline...
there is some chance for ramdisk too. it is called via reserve_bootmem_generic.

YH


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