linux-kernel - Re: [PATCH 1/3] xvmalloc memory allocator

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Date:	Sun, 29 Mar 2009 12:39:54 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	ngupta@...are.org
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Ed Tomlinson <edt@....ca>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] xvmalloc memory allocator

Nitin Gupta wrote:
> +static void stat_inc(u64 *value)
> +{
> +    (*value)++;
> +}
> +
> +static void stat_dec(u64 *value)
> +{
> +    (*value)--;
> +}

Why not open code it?

> +
> +static u32 test_flag(struct block_header *block, enum blockflags flag)
> +{
> +    return block->prev & (1 << flag);
> +}
> +
> +static void set_flag(struct block_header *block, enum blockflags flag)
> +{
> +    block->prev |= (1 << flag);
> +}
> +
> +static void clear_flag(struct block_header *block, enum blockflags flag)
> +{
> +    block->prev &= ~(1 << flag);
> +}

Why don't you use test_bit / __set_bit / __clear_bit directly?

> +struct xv_pool *xv_create_pool(void)
> +{
> +    int i;
> +    u32 ovhd_size;
> +    struct xv_pool *pool;
> +
> +    ovhd_size = roundup(sizeof(*pool), PAGE_SIZE);
> +    pool = kmalloc(ovhd_size, GFP_KERNEL);
> +    if (!pool)
> +        return NULL;
> +
> +    memset(pool, 0, ovhd_size);

Please use kzalloc.

> +
> +    for (i = 0; i < NUM_FREE_LISTS; i++) {
> +        pool->freelist[i].pagenum = 0;
> +        pool->freelist[i].offset = 0;
> +    }

It was already zeroed by memset.

> +
> +    spin_lock_init(&pool->lock);
> +
> +    return pool;
> +}
> +EXPORT_SYMBOL_GPL(xv_create_pool);
> +
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