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Date: Thu, 7 Apr 2011 14:40:57 -0700 (PDT)
From: David Rientjes <rientjes@...gle.com>
To: Dave Hansen <dave@...ux.vnet.ibm.com>
cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Timur Tabi <timur@...escale.com>,
Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] rename alloc_pages_exact()
On Thu, 7 Apr 2011, Dave Hansen wrote:
>
> alloc_pages_exact() returns a virtual address. But, alloc_pages() returns
> a 'struct page *'. That makes for very confused kernel hackers.
>
> __get_free_pages(), on the other hand, returns virtual addresses. That
> makes alloc_pages_exact() a much closer match to __get_free_pages(), so
> rename it to get_free_pages_exact().
>
The patch also reverses the arguments of the function in
include/linux/gfp.h, undoubtedly to resemble the (mask, order) appearance
of __get_free_pages():
-void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
+void *get_free_pages_exact(gfp_t gfp_mask, size_t size);
> Note that alloc_pages_exact()'s partner, free_pages_exact() already
> matches free_pages(), so we do not have to touch the free side of things.
>
> Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com>
> Acked-by: Andi Kleen <ak@...ux.intel.com>
> ---
>
> linux-2.6.git-dave/drivers/video/fsl-diu-fb.c | 2 +-
> linux-2.6.git-dave/drivers/video/mxsfb.c | 2 +-
> linux-2.6.git-dave/drivers/video/pxafb.c | 4 ++--
> linux-2.6.git-dave/drivers/virtio/virtio_pci.c | 2 +-
> linux-2.6.git-dave/include/linux/gfp.h | 2 +-
> linux-2.6.git-dave/kernel/profile.c | 2 +-
> linux-2.6.git-dave/mm/page_alloc.c | 24 ++++++++++++------------
> linux-2.6.git-dave/mm/page_cgroup.c | 2 +-
> 8 files changed, 20 insertions(+), 20 deletions(-)
>
> diff -puN drivers/video/fsl-diu-fb.c~change-alloc_pages_exact-name drivers/video/fsl-diu-fb.c
> --- linux-2.6.git/drivers/video/fsl-diu-fb.c~change-alloc_pages_exact-name 2011-04-07 08:37:58.074400957 -0700
> +++ linux-2.6.git-dave/drivers/video/fsl-diu-fb.c 2011-04-07 08:37:58.186400949 -0700
> @@ -294,7 +294,7 @@ static void *fsl_diu_alloc(size_t size,
>
> pr_debug("size=%zu\n", size);
>
> - virt = alloc_pages_exact(size, GFP_DMA | __GFP_ZERO);
> + virt = get_free_pages_exact(GFP_DMA | __GFP_ZERO, size);
> if (virt) {
> *phys = virt_to_phys(virt);
> pr_debug("virt=%p phys=%llx\n", virt,
> diff -puN drivers/video/pxafb.c~change-alloc_pages_exact-name drivers/video/pxafb.c
> --- linux-2.6.git/drivers/video/pxafb.c~change-alloc_pages_exact-name 2011-04-07 08:37:58.078400957 -0700
> +++ linux-2.6.git-dave/drivers/video/pxafb.c 2011-04-07 08:39:16.198395385 -0700
> @@ -905,7 +905,7 @@ static int __devinit pxafb_overlay_map_v
> /* We assume that user will use at most video_mem_size for overlay fb,
> * anyway, it's useless to use 16bpp main plane and 24bpp overlay
> */
> - ofb->video_mem = alloc_pages_exact(PAGE_ALIGN(pxafb->video_mem_size),
> + ofb->video_mem = get_free_pages_exact(PAGE_ALIGN(pxafb->video_mem_size),
> GFP_KERNEL | __GFP_ZERO);
> if (ofb->video_mem == NULL)
> return -ENOMEM;
Doesn't look like this is using the arguments in the newly changed order.
> @@ -1714,7 +1714,7 @@ static int __devinit pxafb_init_video_me
> {
> int size = PAGE_ALIGN(fbi->video_mem_size);
>
> - fbi->video_mem = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
> + fbi->video_mem = get_free_pages_exact(GFP_KERNEL | __GFP_ZERO, size);
> if (fbi->video_mem == NULL)
> return -ENOMEM;
>
> diff -puN drivers/virtio/virtio_pci.c~change-alloc_pages_exact-name drivers/virtio/virtio_pci.c
> --- linux-2.6.git/drivers/virtio/virtio_pci.c~change-alloc_pages_exact-name 2011-04-07 08:37:58.082400957 -0700
> +++ linux-2.6.git-dave/drivers/virtio/virtio_pci.c 2011-04-07 08:37:58.190400949 -0700
> @@ -385,7 +385,7 @@ static struct virtqueue *setup_vq(struct
> info->msix_vector = msix_vec;
>
> size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
> - info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
> + info->queue = get_free_pages_exact(GFP_KERNEL|__GFP_ZERO, size);
> if (info->queue == NULL) {
> err = -ENOMEM;
> goto out_info;
> diff -puN include/linux/gfp.h~change-alloc_pages_exact-name include/linux/gfp.h
> --- linux-2.6.git/include/linux/gfp.h~change-alloc_pages_exact-name 2011-04-07 08:37:58.086400956 -0700
> +++ linux-2.6.git-dave/include/linux/gfp.h 2011-04-07 08:37:58.190400949 -0700
> @@ -351,7 +351,7 @@ extern struct page *alloc_pages_vma(gfp_
> extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
> extern unsigned long get_zeroed_page(gfp_t gfp_mask);
>
> -void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
> +void *get_free_pages_exact(gfp_t gfp_mask, size_t size);
> void free_pages_exact(void *virt, size_t size);
>
> #define __get_free_page(gfp_mask) \
> diff -puN kernel/profile.c~change-alloc_pages_exact-name kernel/profile.c
> --- linux-2.6.git/kernel/profile.c~change-alloc_pages_exact-name 2011-04-07 08:37:58.090400955 -0700
> +++ linux-2.6.git-dave/kernel/profile.c 2011-04-07 08:37:58.190400949 -0700
> @@ -121,7 +121,7 @@ int __ref profile_init(void)
> if (prof_buffer)
> return 0;
>
> - prof_buffer = alloc_pages_exact(buffer_bytes,
> + prof_buffer = get_free_pages_exact(buffer_bytes,
> GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN);
> if (prof_buffer)
> return 0;
Here either.
Everything else looks good, so once these are corrected:
Acked-by: David Rientjes <rientjes@...gle.com>
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