On Tue, Apr 12, 2005 at 05:55:01AM -0400, Jes Sorensen wrote:
> Hi Andrew,
>
> This patch provides the generic allocator needed for the ia64 mspec
> driver. Any chance you could add it to the mm tree?
>
> Thanks,
> Jes
>
> Generic allocator that can be used by device driver to manage special
> memory etc. in particular it's used to manage uncached memory on ia64
> for the mspec driver. The allocator is based on the allocator from the
> sym53c8xx_2 driver.
So maybe as an example that your driver is usefull and not just additional
bloat you could convert sym53c8xx_2 (and ncr53c8xxx) to use it?
> +/*
> + * Memory pool of a given kind.
> + * Ideally, we want to use:
> + * 1) 1 pool for memory we donnot need to involve in DMA.
> + * 2) The same pool for controllers that require same DMA
> + * constraints and features.
> + * The OS specific m_pool_id_t thing and the gen_pool_match()
> + * method are expected to tell the driver about.
> + */
these comments don't make any sense.
> +unsigned long gen_pool_alloc(struct gen_pool *poolp, int size);
> +void gen_pool_free(struct gen_pool *mp, unsigned long ptr, int size);
> +struct gen_pool *alloc_gen_pool(int nr_chunks, int max_chunk_shift,
> + unsigned long (*fp)(struct gen_pool *),
> + unsigned long data);
shouldn't there be a way to release the pool again? Also we usu�lly
call these _create/_destroy
> +#ifdef CONFIG_GENERIC_ALLOCATOR
> + gen_pool_init();
> +#endif
please avoid hardcoded initcalls.
> +config GENERIC_ALLOCATOR
> + boolean
bool
> +#include <linux/config.h>
not needed.
> +#include <linux/module.h>
> +#include <linux/stddef.h>
> +#include <linux/kernel.h>
> +#include <linux/string.h>
> +#include <linux/slab.h>
> +#include <linux/init.h>
> +#include <linux/mm.h>
> +#include <linux/spinlock.h>
> +#include <linux/genalloc.h>
> +
> +#include <asm/page.h>
> +#include <asm/pal.h>
> +
> +
> + /*
> + * This is really an arbitrary limit, +10 is enough for
> + * IA64_GRANULE_SHIFT.
> + */
What's IA64_GRANULE_SHIFT and why do we care?
> +#if DEBUG
> + printk(KERN_DEBUG "gen_pool_alloc: s %02x, i %i, h %p\n", s, i, h);
> +#endif
please avoid ifdefs in the middle of the code. if you think keeping this
trivial debug code in is so valueable add a helper that gets defined away
for the non-debug case.
> +int __init gen_pool_init(void)
> +{
> + printk(KERN_INFO "Generic memory pool allocator v1.0\n");
> + return 0;
> +}
no need to print a init message for a set of trivial library function
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