Re: [Patch 2/2] Special Memory (mspec) driver.

From: Robin Holt
Date: Fri Oct 14 2005 - 13:10:54 EST

On Thu, Oct 13, 2005 at 10:12:05PM -0700, Dave Hansen wrote:
> On Wed, 2005-10-12 at 14:42 -0500, Robin Holt wrote:
> ...
> Looks like you could un-indent almost the entire function of you just
> did this instead:
> if (!atomic_dec_and_test(&vdata->refcnt))
> return;


> This looks pretty similar to get_one_pte_map(). Is there enough
> commonality to use it?

Added an extra patch to export get_one_pte_map and used that instead.

> How about:
> vdata = vmalloc(sizeof(struct vma_data) + pages * sizeof(long));
> if (!vdata)
> return -ENOMEM;


> This whole thing really is a driver for a piece of arch-specific
> hardware, right? Does it really belong in /proc? You already have a
> misc device, so you already have some area in sysfs. Would that make a
> better place for it?

Most of the useful information for this was removed when the kernel
uncached allocator (and gen_alloc) were moved out of the earliest mspec.c.
Removed entirely.

> Isn't the general kernel style for these to keep the action out of the
> if() condition?
> ret = misc_register(&cached_miscdev);
> if (ret) {
> ...


Robin Holt
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at