From: Santosh Shilimkar <santosh.shilimkar@ti.com>
To: Tejun Heo <tj@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Yinghai Lu <yinghai@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Strashko, Grygorii" <grygorii.strashko@ti.com>
Subject: Re: [PATCH v3 08/23] mm/memblock: Add memblock memory allocation apis
Date: Fri, 20 Dec 2013 17:30:23 -0500 [thread overview]
Message-ID: <52B4C4FF.1020009@ti.com> (raw)
In-Reply-To: <52ACB608.3050802@ti.com>
On Saturday 14 December 2013 02:48 PM, Santosh Shilimkar wrote:
> On Saturday 14 December 2013 06:08 AM, Tejun Heo wrote:
>> Hello, Santosh.
>>
>> On Fri, Dec 13, 2013 at 07:52:42PM -0500, Santosh Shilimkar wrote:
>>>>> +static void * __init memblock_virt_alloc_internal(
>>>>> + phys_addr_t size, phys_addr_t align,
>>>>> + phys_addr_t min_addr, phys_addr_t max_addr,
>>>>> + int nid)
>>>>> +{
>>>>> + phys_addr_t alloc;
>>>>> + void *ptr;
>>>>> +
>>>>> + if (nid == MAX_NUMNODES)
>>>>> + pr_warn("%s: usage of MAX_NUMNODES is depricated. Use NUMA_NO_NODE\n",
>>>>> + __func__);
>>>>
>>>> Why not use WARN_ONCE()? Also, shouldn't nid be set to NUMA_NO_NODE
>>>> here?
>>>>
>>> You want all the users using MAX_NUMNODES to know about it so that
>>> the wrong usage can be fixed. WARN_ONCE will hide that.
>>
>> Well, it doesn't really help anyone to be printing multiple messages
>> without any info on who was the caller and if this thing is gonna be
>> in mainline triggering of the warning should be rare anyway. It's
>> more of a tool to gather one-off cases in the wild. WARN_ONCE()
>> usually is the better choice as otherwise the warnings can swamp the
>> machine and console output in certain cases.
>>
> Fair enough.
>
>>>> ...
>>>>> + if (nid != NUMA_NO_NODE) {
>>>>
>>>> Otherwise, the above test is broken.
>>>>
>>> So the idea was just to warn the users and allow them to fix
>>> the code. Well we are just allowing the existing users of using
>>> either MAX_NUMNODES or NUMA_NO_NODE continue to work. Thats what
>>> we discussed, right ?
>>
>> Huh? Yeah, sure. You're testing @nid against MAX_NUMNODES at the
>> beginning of the function. If it's MAX_NUMNODES, you print a warning
>> but nothing else, so the if() conditional above, which should succeed,
>> would fail. Am I missing sth here?
>>
> I get it now. Sorry I missed your point in first part. We will fix this.
>
Posted an incremental fix based on above discussion. You have been
copied on the patch.
Regards,
Santosh
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next prev parent reply other threads:[~2013-12-20 22:30 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-09 21:50 [PATCH v3 00/23] mm: Use memblock interface instead of bootmem Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 01/23] mm/memblock: debug: correct displaying of upper memory boundary Santosh Shilimkar
2013-12-09 21:56 ` Felipe Balbi
2013-12-09 22:39 ` Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 02/23] mm/memblock: debug: don't free reserved array if !ARCH_DISCARD_MEMBLOCK Santosh Shilimkar
2013-12-10 0:11 ` Andrew Morton
2013-12-10 16:44 ` Grygorii Strashko
2013-12-09 21:50 ` [PATCH v3 03/23] mm/bootmem: remove duplicated declaration of __free_pages_bootmem() Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 04/23] mm/memblock: remove unnecessary inclusions of bootmem.h Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 05/23] mm/memblock: drop WARN and use SMP_CACHE_BYTES as a default alignment Santosh Shilimkar
2013-12-13 21:21 ` Tejun Heo
2013-12-09 21:50 ` [PATCH v3 06/23] mm/memblock: reorder parameters of memblock_find_in_range_node Santosh Shilimkar
2013-12-13 21:22 ` Tejun Heo
2013-12-09 21:50 ` [PATCH v3 07/23] mm/memblock: switch to use NUMA_NO_NODE instead of MAX_NUMNODES Santosh Shilimkar
2013-12-13 21:29 ` Tejun Heo
2013-12-14 0:44 ` Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 08/23] mm/memblock: Add memblock memory allocation apis Santosh Shilimkar
2013-12-10 0:25 ` Andrew Morton
2013-12-10 16:04 ` Santosh Shilimkar
2013-12-13 21:37 ` Tejun Heo
2013-12-14 0:52 ` Santosh Shilimkar
2013-12-14 11:08 ` Tejun Heo
2013-12-14 19:48 ` Santosh Shilimkar
2013-12-20 22:30 ` Santosh Shilimkar [this message]
2013-12-09 21:50 ` [PATCH v3 09/23] mm/init: Use memblock apis for early memory allocations Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 10/23] mm/printk: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 11/23] mm/page_alloc: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 12/23] mm/power: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 13/23] mm/lib/swiotlb: " Santosh Shilimkar
2013-12-13 1:08 ` Andrew Morton
2013-12-13 1:24 ` Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 14/23] mm/lib/cpumask: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 15/23] mm/sparse: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 16/23] mm/hugetlb: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 17/23] mm/page_cgroup: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 18/23] mm/percpu: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 19/23] mm/memory_hotplug: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 20/23] mm/firmware: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 21/23] mm/ARM: kernel: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 22/23] mm/ARM: mm: " Santosh Shilimkar
2013-12-09 21:50 ` [PATCH v3 23/23] mm/ARM: OMAP: " Santosh Shilimkar
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