linux-kernel - Re: [PATCH 3/3 v4] mm/vmalloc: Cache the vmalloc memory info

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Date:	Mon, 24 Aug 2015 09:11:34 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	George Spelvin <linux@...izon.com>, dave@...1.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux@...musvillemoes.dk, peterz@...radead.org, riel@...hat.com,
	rientjes@...gle.com, torvalds@...ux-foundation.org
Subject: Re: [PATCH 3/3 v4] mm/vmalloc: Cache the vmalloc memory info

>>>>> "Ingo" == Ingo Molnar <mingo@...nel.org> writes:

Ingo> * George Spelvin <linux@...izon.com> wrote:

>> First, an actual, albeit minor, bug: initializing both vmap_info_gen
>> and vmap_info_cache_gen to 0 marks the cache as valid, which it's not.

Ingo> Ha! :-) Fixed.

>> vmap_info_gen should be initialized to 1 to force an initial
>> cache update.

Blech, it should be initialized with a proper #define
VMAP_CACHE_NEEDS_UPDATE 1, instead of more magic numbers.


Ingo> + */
Ingo> +static DEFINE_SPINLOCK(vmap_info_lock);
Ingo> +static int vmap_info_gen = 1;

   static int vmap_info_gen = VMAP_CACHE_NEEDS_UPDATE;

Ingo> +static int vmap_info_cache_gen;
Ingo> +static struct vmalloc_info vmap_info_cache;
Ingo> +#endif


This will help keep bugs like this out in the future... I hope!
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