linux-kernel - Re: [PATCH TRIVIAL] mm: Fix build warning in kmem_cache

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Date:	Sun, 15 Jul 2012 21:04:00 -0600
From:	Shuah Khan <shuah.khan@...com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	David Rientjes <rientjes@...gle.com>, cl@...ux.com,
	glommer@...allels.com, js1304@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, shuahkhan@...il.com
Subject: Re: [PATCH TRIVIAL] mm: Fix build warning in kmem_cache_create()

On Sat, 2012-07-14 at 15:01 +0300, Pekka Enberg wrote:

> I'm not exactly loving that either.
> 
> It'd probably be better to reshuffle the code so that the debug checks
> end up in separate functions that are no-op for !CONFIG_DEBUG_VM. That
> way the _labels_ are used unconditionally although there's no actual
> code generated.

I can work on reshuffling the code. Do have a question though. This
following sanity check is currently done only when CONFIG_DEBUG_VM is
defined. However, it does appear to be something that is that should be
checked even in regular path.

struct kmem_cache *kmem_cache_create(const char *name, size_t size,
size_t align,
                unsigned long flags, void (*ctor)(void *))
{
        struct kmem_cache *s = NULL;

#ifdef CONFIG_DEBUG_VM
        if (!name || in_interrupt() || size < sizeof(void *) ||
                size > KMALLOC_MAX_SIZE) {
                printk(KERN_ERR "kmem_cache_create(%s) integrity check"
                        " failed\n", name);
                goto out;
        }
#endif



---

}

Am I reading this right?

Thanks,
-- Shuah

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