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gpu: ion: use vmalloc to allocate page array to map kernel

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When ion_map_kernel is execute the system must allocate
an array large enough to hold a pointer to each page in
the buffer.  If the buffer is very large and the system
memory has become very fragmented, there may not be
sufficient high order allocations available from kmalloc.
Use vmalloc instead.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rebecca Schultz Zavin 2013-12-13 14:24:09 -08:00 committed by Greg Kroah-Hartman
parent b0599c0140
commit 98d5d5f8ba
1 changed files with 5 additions and 3 deletions
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8
drivers/staging/android/ion/ion_system_heap.c
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@ -174,10 +174,12 @@ void *ion_system_heap_map_kernel(struct ion_heap *heap,
pgprot_t pgprot;
struct sg_table *table = buffer->priv_virt;
int npages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
struct page **pages = kzalloc(sizeof(struct page *) * npages,
GFP_KERNEL);
struct page **pages = vmalloc(sizeof(struct page *) * npages);
struct page **tmp = pages;
if (!pages)
return 0;
if (buffer->flags & ION_FLAG_CACHED)
pgprot = PAGE_KERNEL;
else
@ -192,7 +194,7 @@ void *ion_system_heap_map_kernel(struct ion_heap *heap,
}
}
vaddr = vmap(pages, npages, VM_MAP, pgprot);
kfree(pages);
vfree(pages);
return vaddr;
}