[mm PATCH 1/3] mm: Rename __alloc_page_frag to page_frag_alloc and __free_page_frag to page_frag_free

Alexander Duyck
2016-11-29T18:23:45Z

From: Alexander Duyck <alexander.h.duyck@intel.com>

This patch renames the page frag functions to be more consistent with other
APIs. Specifically we place the name page_frag first in the name and then
have either an alloc or free call name that we append as the suffix. This
makes it a bit clearer in terms of naming.

In addition we drop the leading double underscores since we are technically
no longer a backing interface and instead the front end that is called from
the networking APIs.

The last bit I changed is I rebased page_frag_free to actually function
very similar to the function free_pages, the only real difference now is
the fact that we have to get the page order by calling compound page
instead of having it passed as a part of the function call.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
---
include/linux/gfp.h | 6 +++---
include/linux/skbuff.h | 2 +-
mm/page_alloc.c | 20 ++++++++++++--------
net/core/skbuff.c | 8 ++++----
4 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 4175dca4ac39..6238c74e0a01 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -508,9 +508,9 @@ extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
struct page_frag_cache;
extern void __page_frag_drain(struct page *page, unsigned int order,
unsigned int count);
-extern void *__alloc_page_frag(struct page_frag_cache *nc,
- unsigned int fragsz, gfp_t gfp_mask);
-extern void __free_page_frag(void *addr);
+extern void *page_frag_alloc(struct page_frag_cache *nc,
+ unsigned int fragsz, gfp_t gfp_mask);
+extern void page_frag_free(void *addr);

#define __free_page(page) __free_pages((page), 0)
#define free_page(addr) free_pages((addr), 0)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 9c535fbccf2c..95799826a1e7 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2471,7 +2471,7 @@ static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,

static inline void skb_free_frag(void *addr)
{
- __free_page_frag(addr);
+ page_frag_free(addr);
}

void *napi_alloc_frag(unsigned int fragsz);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bb668eab5ee4..4218795a4694 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3931,8 +3931,8 @@ void __page_frag_drain(struct page *page, unsigned int order,
}
EXPORT_SYMBOL(__page_frag_drain);

-void *__alloc_page_frag(struct page_frag_cache *nc,
- unsigned int fragsz, gfp_t gfp_mask)
+void *page_frag_alloc(struct page_frag_cache *nc,
+ unsigned int fragsz, gfp_t gfp_mask)
{
unsigned int size = PAGE_SIZE;
struct page *page;
@@ -3983,19 +3983,23 @@ void *__alloc_page_frag(struct page_frag_cache *nc,

return nc->va + offset;
}
-EXPORT_SYMBOL(__alloc_page_frag);
+EXPORT_SYMBOL(page_frag_alloc);

/*
* Frees a page fragment allocated out of either a compound or order 0 page.
*/
-void __free_page_frag(void *addr)
+void page_frag_free(void *addr)
{
- struct page *page = virt_to_head_page(addr);
+ struct page *page;
+
+ if (addr != 0) {
+ VM_BUG_ON(!virt_addr_valid(addr));
+ page = virt_to_head_page(addr);

- if (unlikely(put_page_testzero(page)))
- __free_pages_ok(page, compound_order(page));
+ __free_pages(page, compound_order(page));
+ }
}
-EXPORT_SYMBOL(__free_page_frag);
+EXPORT_SYMBOL(page_frag_free);

static void *make_alloc_exact(unsigned long addr, unsigned int order,
size_t size)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4c96cb18c214..6cf779a9ad4c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -369,7 +369,7 @@ static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)

local_irq_save(flags);
nc = this_cpu_ptr(&netdev_alloc_cache);
- data = __alloc_page_frag(nc, fragsz, gfp_mask);
+ data = page_frag_alloc(nc, fragsz, gfp_mask);
local_irq_restore(flags);
return data;
}
@@ -391,7 +391,7 @@ static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
{
struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);

- return __alloc_page_frag(&nc->page, fragsz, gfp_mask);
+ return page_frag_alloc(&nc->page, fragsz, gfp_mask);
}

void *napi_alloc_frag(unsigned int fragsz)
@@ -441,7 +441,7 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int len,
local_irq_save(flags);

nc = this_cpu_ptr(&netdev_alloc_cache);
- data = __alloc_page_frag(nc, len, gfp_mask);
+ data = page_frag_alloc(nc, len, gfp_mask);
pfmemalloc = nc->pfmemalloc;

local_irq_restore(flags);
@@ -505,7 +505,7 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
if (sk_memalloc_socks())
gfp_mask |= __GFP_MEMALLOC;

- data = __alloc_page_frag(&nc->page, len, gfp_mask);
+ data = page_frag_alloc(&nc->page, len, gfp_mask);
if (unlikely(!data))
return NULL;