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

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Message-ID: <4BC4043A.5080404@oracle.com>
Date:	Mon, 12 Apr 2010 22:42:18 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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 04/12/2010 10:13 PM, Benjamin Herrenschmidt wrote:
> 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.
> 
__alloc_memory_core_early() already include that find_memory_core_early() lines
it is merged for CONFIG_NO_BOOTMEM support.

I split it out, so lmb_find_area_node() could reuse those lines.

YH
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