From: Hugh Dickins Date: Tue, 22 Nov 2005 05:32:22 +0000 (-0800) Subject: [PATCH] unpaged: fix sound Bad page states X-Git-Tag: v2.6.15-rc3~109 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f3d48f0373c14a6203202f7b1dfc7b0d8aaf6ed2;p=linux-2.6 [PATCH] unpaged: fix sound Bad page states Earlier I unifdefed PageCompound, so that snd_pcm_mmap_control_nopage and others can give out a 0-order component of a higher-order page, which won't be mistakenly freed when zap_pte_range unmaps it. But many Bad page states reported a PG_reserved was freed after all: I had missed that we need to say __GFP_COMP to get compound page behaviour. Some of these higher-order pages are allocated by snd_malloc_pages, some by snd_malloc_dev_pages; or if SBUS, by sbus_alloc_consistent - but that has no gfp arg, so add __GFP_COMP into its sparc32/64 implementations. I'm still rather puzzled that DRM seems not to need a similar change. Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c index d0f2bd227c..d39c9f2062 100644 --- a/arch/sparc/kernel/ioport.c +++ b/arch/sparc/kernel/ioport.c @@ -252,7 +252,7 @@ void *sbus_alloc_consistent(struct sbus_dev *sdev, long len, u32 *dma_addrp) } order = get_order(len_total); - if ((va = __get_free_pages(GFP_KERNEL, order)) == 0) + if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0) goto err_nopages; if ((res = kmalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) diff --git a/arch/sparc64/kernel/sbus.c b/arch/sparc64/kernel/sbus.c index 96b8250556..d95a1bcf16 100644 --- a/arch/sparc64/kernel/sbus.c +++ b/arch/sparc64/kernel/sbus.c @@ -327,7 +327,7 @@ void *sbus_alloc_consistent(struct sbus_dev *sdev, size_t size, dma_addr_t *dvma order = get_order(size); if (order >= 10) return NULL; - first_page = __get_free_pages(GFP_KERNEL, order); + first_page = __get_free_pages(GFP_KERNEL|__GFP_COMP, order); if (first_page == 0UL) return NULL; memset((char *)first_page, 0, PAGE_SIZE << order); diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index 129abab5ce..e4b8959dd4 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -197,6 +197,7 @@ void *snd_malloc_pages(size_t size, gfp_t gfp_flags) snd_assert(size > 0, return NULL); 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); @@ -241,6 +242,7 @@ static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *d snd_assert(dma != NULL, return NULL); pg = get_order(size); gfp_flags = GFP_KERNEL + | __GFP_COMP /* compound page lets parts be mapped */ | __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);