linux-kernel - Re: [RFC] mm: generic adaptive large memory allocation APIs

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Message-Id: <201005060312.o463CUOQ085547@www262.sakura.ne.jp>
Date:	Thu, 06 May 2010 12:12:30 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	xiaosuo@...il.com
Cc:	eric.dumazet@...il.com, jslaby@...e.cz, viro@...iv.linux.org.uk,
	paulmck@...ux.vnet.ibm.com, adobriyan@...il.com, mingo@...e.hu,
	peterz@...radead.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, avi@...hat.com,
	akpm@...ux-foundation.org
Subject: Re: [RFC] mm: generic adaptive large memory allocation APIs

Changli Gao wrote:
> struct kvfree_work_struct {
> 	struct work_struct	work;
> 	void			*head;
> 	void			**ptail;
> };

I wonder why "struct kvfree_work_struct" is needed.
According to http://kernel.ubuntu.com/git?p=jj/ubuntu-lucid.git;a=blobdiff;f=security/apparmor/match.c;h=d2cd55419acfcae85cb748c8f837a4384a3a0d29;hp=afc2dd2260edffcf88521ae86458ad03aa8ea12c;hb=f5eba4b0a01cc671affa429ba1512b6de7caeb5b;hpb=abdff9ddaf2644d0f9962490f73e030806ba90d3 ,

static void kvfree_work(struct work_struct *work)
{
	vfree(work);
}

void kvfree_inatomic(void *ptr, size_t size)
{
	if (size < PAGE_SIZE) {
		kfree(ptr);
	} else if (is_vmalloc_addr(ptr)) {
		/*
		 * We can embed "struct work_struct" inside *ptr
		 * because size >= PAGE_SIZE.
		 */
		struct work_struct *work = ptr;
		BUILD_BUG_ON(sizeof(struct work_struct) > PAGE_SIZE);
		INIT_WORK(&work, kvfree_work);
		schedule_work(&work);
	} else {
		free_pages_exact(ptr, size);
	}
}

should do what you want. (Though, I didn't test it.)
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