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[PATCH] unpaged: fix sound Bad page states

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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 <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins
2005-11-21 21:32:22 -08:00
committed by Linus Torvalds
parent 0b0db14c53
commit f3d48f0373
3 changed files with 4 additions and 2 deletions
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2
arch/sparc64/kernel/sbus.c
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@ -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);