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Message-ID: <87r597jt45.fsf@gmail.com>
Date: Wed, 13 Apr 2011 02:07:38 +0900
From: Namhyung Kim <namhyung@...il.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>,
Michal Nazarewicz <mina86@...a86.com>,
David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 1/3] rename alloc_pages_exact()
Dave Hansen <dave@...ux.vnet.ibm.com> writes:
> 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(). Also change the arguments to have
> flags first, just like __get_free_pages().
>
> 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>
> Acked-by: David Rientjes <rientjes@...gle.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 | 6 +++---
> 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 | 4 ++--
> linux-2.6.git-dave/mm/page_alloc.c | 18 +++++++++---------
> linux-2.6.git-dave/mm/page_cgroup.c | 2 +-
> 8 files changed, 19 insertions(+), 19 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 2011-04-11 15:01:16.453823153 -0700
> +++ linux-2.6.git-dave/drivers/video/fsl-diu-fb.c 2011-04-11 15:01:16.489823137 -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/mxsfb.c~change-alloc_pages_exact-name drivers/video/mxsfb.c
> --- linux-2.6.git/drivers/video/mxsfb.c~change-alloc_pages_exact-name 2011-04-11 15:01:16.457823151 -0700
> +++ linux-2.6.git-dave/drivers/video/mxsfb.c 2011-04-11 15:01:16.489823137 -0700
> @@ -718,7 +718,7 @@ static int __devinit mxsfb_init_fbinfo(s
> } else {
> if (!fb_size)
> fb_size = SZ_2M; /* default */
> - fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
> + fb_virt = get_free_pages_exact(GFP_DMA, fb_size);
> if (!fb_virt)
> return -ENOMEM;
>
> 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 2011-04-11 15:01:16.461823149 -0700
> +++ linux-2.6.git-dave/drivers/video/pxafb.c 2011-04-11 15:01:16.493823135 -0700
> @@ -905,8 +905,8 @@ 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),
> - GFP_KERNEL | __GFP_ZERO);
> + ofb->video_mem = get_free_pages_exact(GFP_KERNEL | __GFP_ZERO,
> + PAGE_ALIGN(pxafb->video_mem_size));
> if (ofb->video_mem == NULL)
> return -ENOMEM;
>
> @@ -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 2011-04-11 15:01:16.465823147 -0700
> +++ linux-2.6.git-dave/drivers/virtio/virtio_pci.c 2011-04-11 15:01:16.493823135 -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 2011-04-11 15:01:16.469823145 -0700
> +++ linux-2.6.git-dave/include/linux/gfp.h 2011-04-11 15:01:16.493823135 -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 2011-04-11 15:01:16.473823143 -0700
> +++ linux-2.6.git-dave/kernel/profile.c 2011-04-11 15:01:16.497823133 -0700
> @@ -121,8 +121,8 @@ int __ref profile_init(void)
> if (prof_buffer)
> return 0;
>
> - prof_buffer = alloc_pages_exact(buffer_bytes,
> - GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN);
> + prof_buffer = get_free_pages_exact(GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN,
> + buffer_bytes);
> if (prof_buffer)
> return 0;
>
> diff -puN mm/page_alloc.c~change-alloc_pages_exact-name mm/page_alloc.c
> --- linux-2.6.git/mm/page_alloc.c~change-alloc_pages_exact-name 2011-04-11 15:01:16.477823141 -0700
> +++ linux-2.6.git-dave/mm/page_alloc.c 2011-04-11 15:01:16.501823131 -0700
> @@ -2318,7 +2318,7 @@ void free_pages(unsigned long addr, unsi
> EXPORT_SYMBOL(free_pages);
>
> /**
> - * alloc_pages_exact - allocate an exact number physically-contiguous pages.
> + * get_free_pages_exact - allocate an exact number physically-contiguous pages.
> * @size: the number of bytes to allocate
> * @gfp_mask: GFP flags for the allocation
> *
> @@ -2330,7 +2330,7 @@ EXPORT_SYMBOL(free_pages);
> *
> * Memory allocated by this function must be released by free_pages_exact().
> */
> -void *alloc_pages_exact(size_t size, gfp_t gfp_mask)
> +void *get_free_pages_exact(gfp_t gfp_mask, size_t size)
> {
> unsigned int order = get_order(size);
> unsigned long addr;
> @@ -2349,14 +2349,14 @@ void *alloc_pages_exact(size_t size, gfp
>
> return (void *)addr;
> }
> -EXPORT_SYMBOL(alloc_pages_exact);
> +EXPORT_SYMBOL(get_free_pages_exact);
>
> /**
> - * free_pages_exact - release memory allocated via alloc_pages_exact()
> - * @virt: the value returned by alloc_pages_exact.
> - * @size: size of allocation, same value as passed to alloc_pages_exact().
> + * free_pages_exact - release memory allocated via get_free_pages_exact()
> + * @virt: the value returned by get_free_pages_exact.
> + * @size: size of allocation, same value as passed to get_free_pages_exact().
> *
> - * Release the memory allocated by a previous call to alloc_pages_exact.
> + * Release the memory allocated by a previous call to get_free_pages_exact().
> */
> void free_pages_exact(void *virt, size_t size)
> {
> @@ -5308,10 +5308,10 @@ void *__init alloc_large_system_hash(con
> /*
> * If bucketsize is not a power-of-two, we may free
> * some pages at the end of hash table which
> - * alloc_pages_exact() automatically does
> + * get_free_pages_exact() automatically does
> */
> if (get_order(size) < MAX_ORDER) {
> - table = alloc_pages_exact(size, GFP_ATOMIC);
> + table = get_free_pages_exact(size, GFP_ATOMIC);
This should be table = get_free_pages_exact(GFP_ATOMIC, size);
Thanks.
> kmemleak_alloc(table, size, 1, GFP_ATOMIC);
> }
> }
> diff -puN mm/page_cgroup.c~change-alloc_pages_exact-name mm/page_cgroup.c
> --- linux-2.6.git/mm/page_cgroup.c~change-alloc_pages_exact-name 2011-04-11 15:01:16.481823139 -0700
> +++ linux-2.6.git-dave/mm/page_cgroup.c 2011-04-11 15:01:16.501823131 -0700
> @@ -134,7 +134,7 @@ static void *__init_refok alloc_page_cgr
> {
> void *addr = NULL;
>
> - addr = alloc_pages_exact(size, GFP_KERNEL | __GFP_NOWARN);
> + addr = get_free_pages_exact(GFP_KERNEL | __GFP_NOWARN, size);
> if (addr)
> return addr;
>
> _
>
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