[ALSA] Removed unneeded page-reserve

Modules: Memalloc module

Removed unneeded page-reservation.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/core/memalloc.c

@@ -141,10 +141,6 @@ static void *snd_dma_hack_alloc_coherent(struct device *dev, size_t size,
 
 #endif /* arch */
 
-#if ! defined(__arm__)
-#define NEED_RESERVE_PAGES
-#endif
-
 /*
  *
  *  Generic memory allocators
@@ -163,20 +159,6 @@ static inline void dec_snd_pages(int order)
 	snd_allocated_pages -= 1 << order;
 }
 
-static void mark_pages(struct page *page, int order)
-{
-	struct page *last_page = page + (1 << order);
-	while (page < last_page)
-		SetPageReserved(page++);
-}
-
-static void unmark_pages(struct page *page, int order)
-{
-	struct page *last_page = page + (1 << order);
-	while (page < last_page)
-		ClearPageReserved(page++);
-}
-
 /**
  * snd_malloc_pages - allocate pages with the given size
  * @size: the size to allocate in bytes
@@ -195,10 +177,8 @@ void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
 	snd_assert(gfp_flags != 0, return NULL);
 	gfp_flags |= __GFP_COMP;	/* compound page lets parts be mapped */
 	pg = get_order(size);
-	if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) {
-		mark_pages(virt_to_page(res), pg);
+	if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
 		inc_snd_pages(pg);
-	}
 	return res;
 }
 
@@ -217,7 +197,6 @@ void snd_free_pages(void *ptr, size_t size)
 		return;
 	pg = get_order(size);
 	dec_snd_pages(pg);
-	unmark_pages(virt_to_page(ptr), pg);
 	free_pages((unsigned long) ptr, pg);
 }
 
@@ -242,12 +221,8 @@ static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *d
 		| __GFP_NORETRY /* don't trigger OOM-killer */
 		| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
 	res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
-	if (res != NULL) {
-#ifdef NEED_RESERVE_PAGES
-		mark_pages(virt_to_page(res), pg); /* should be dma_to_page() */
-#endif
+	if (res != NULL)
 		inc_snd_pages(pg);
-	}
 
 	return res;
 }
@@ -262,9 +237,6 @@ static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
 		return;
 	pg = get_order(size);
 	dec_snd_pages(pg);
-#ifdef NEED_RESERVE_PAGES
-	unmark_pages(virt_to_page(ptr), pg); /* should be dma_to_page() */
-#endif
 	dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
 }