linux-kernel - Re: [PATCH 26/39] nobootmem: use lmb.default_alloc_limit in alloc

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Date:	Tue, 13 Apr 2010 15:13:42 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai <yinghai.lu@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 26/39] nobootmem: use lmb.default_alloc_limit in
 alloc_bootmem path

On Mon, 2010-04-12 at 21:50 -0700, Yinghai wrote:
> On 04/12/2010 09:23 PM, Benjamin Herrenschmidt wrote:
> > On Thu, 2010-04-08 at 23:03 -0700, Yinghai Lu wrote:
> >> Generic version __lmb_find_area() is going from high to low, and for 32bit
> >> active_region for 32bit does include high pages
> >>
> >> need to replace the limit with lmb.default_alloc_limit, aka get_max_mapped()
> >>
> >> with this patch, x86 32bit could use generic version of __lmb_find_area()
> > 
> > So you unconditionally add access to some lmb specific data structure to
> > generic code ? That isn't going to work very well on archs that don't
> > use lmb.
> 
> the whole function
> 
> #ifdef CONFIG_HAVE_LMB
> u64 __init find_memory_core_early(int nid, u64 size, u64 align,
>                                         u64 goal, u64 limit)
> {
>         int i;
> 
>         /* Need to go over early_node_map to find out good range for node */
>         for_each_active_range_index_in_nid(i, nid) {
>                 u64 addr;
>                 u64 ei_start, ei_last;
> 
>                 ei_last = early_node_map[i].end_pfn;
>                 ei_last <<= PAGE_SHIFT;
>                 ei_start = early_node_map[i].start_pfn;
>                 ei_start <<= PAGE_SHIFT;
>                 addr = __lmb_find_area(ei_start, ei_last,
>                                          goal, limit, size, align);
> 
>                 if (addr == -1ULL)
>                         continue;
> 
>                 return addr;
>         }
> 
>         return -1ULL;
> }
> #endif
> 
> need to access early_node_map[], so leave the function here.

Hrm... find_memory_core_early() is a broken API anyways. Did you add
that ? Again, you insist on pushing all over the place that crakpot
find/reserve API instead of doing a proper allocation, and it's now
leaking with ifdef's & all into the generic code.

This is just all a pile of shit.

I'm tempted to NACK the whole thing and wait for somebody who can code
to come up with something half decent.

Ben.


> > 
> > Also, those things should be local to lmb_* anyways.
> 
> if you insist, could move it to lmb.c and use work_with_active_regions() around it.
> 
> YH
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