From: Oscar Salvador <osalvador@techadventures.net>
To: David Hildenbrand <david@redhat.com>
Cc: akpm@linux-foundation.org, mhocko@suse.com,
dan.j.williams@intel.com, jglisse@redhat.com, rafael@kernel.org,
yasu.isimatu@gmail.com, logang@deltatee.com,
dave.jiang@intel.com, Jonathan.Cameron@huawei.com,
vbabka@suse.cz, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Oscar Salvador <osalvador@suse.de>
Subject: Re: [PATCH v2 2/3] mm/memory_hotplug: Drop mem_blk check from unregister_mem_sect_under_nodes
Date: Tue, 14 Aug 2018 12:06:44 +0200 [thread overview]
Message-ID: <20180814100644.GB6979@techadventures.net> (raw)
In-Reply-To: <39454952-f8c9-4ded-acb5-02192e889de0@redhat.com>
On Tue, Aug 14, 2018 at 11:44:50AM +0200, David Hildenbrand wrote:
>
> Yes I know, as I said, if it would be local to a file I would not care.
> Making this functions never return an error is nice, though (and as you
> noted, the return value is never checked).
>
> I am a friend of stating which conditions a function expects to hold if
> a function can be called from other parts of the system. Usually I
> prefer to use BUG_ONs for that (whoever decides to call it can directly
> see what he as to check before calling) or comments. But comments tend
> to become obsolete.
Uhm, I think a BUG_ON is too much here.
We could replace the check with a WARN_ON, just in case
a new function decides to call unregister_mem_sect_under_nodes() in the future.
Something like:
WARN_ON(!mem_blk)
return;
In that case, we should get a nice splat in the logs that should tell us
who is calling it with an invalid mem_blk.
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2018-08-14 10:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-13 15:46 [PATCH v2 0/3] Refactoring for remove_memory_section/unregister_mem_sect_under_nodes osalvador
2018-08-13 15:46 ` [PATCH v2 1/3] mm/memory-hotplug: Drop unused args from remove_memory_section osalvador
2018-08-14 9:29 ` David Hildenbrand
2018-08-13 15:46 ` [PATCH v2 2/3] mm/memory_hotplug: Drop mem_blk check from unregister_mem_sect_under_nodes osalvador
2018-08-14 9:30 ` David Hildenbrand
2018-08-14 9:36 ` Oscar Salvador
2018-08-14 9:44 ` David Hildenbrand
2018-08-14 10:06 ` Oscar Salvador [this message]
2018-08-14 10:09 ` David Hildenbrand
2018-08-14 12:36 ` Oscar Salvador
2018-08-13 15:46 ` [PATCH v2 3/3] mm/memory_hotplug: Refactor unregister_mem_sect_under_nodes osalvador
2018-08-14 9:39 ` David Hildenbrand
2018-08-14 9:55 ` Oscar Salvador
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