Fix vmalloc_32 to really allocate <4GB on 64bit platforms Ugly ifdef, but should handle all 64bit platforms that have suitable zones. On some like Altix it's probably impossible without IOMMU use to get memory <4GB this way, but they have to live with that. Signed-off-by: Andi Kleen --- mm/vmalloc.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) Index: linux/mm/vmalloc.c =================================================================== --- linux.orig/mm/vmalloc.c +++ linux/mm/vmalloc.c @@ -579,6 +579,14 @@ void *vmalloc_exec(unsigned long size) return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC); } +#if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32) +#define GFP_VMALLOC32 GFP_DMA32 +#elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA) +#define GFP_VMALLOC32 GFP_DMA +#else +#define GFP_VMALLOC32 GFP_KERNEL +#endif + /** * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) * @size: allocation size @@ -588,7 +596,7 @@ void *vmalloc_exec(unsigned long size) */ void *vmalloc_32(unsigned long size) { - return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL); + return __vmalloc(size, GFP_VMALLOC32, PAGE_KERNEL); } EXPORT_SYMBOL(vmalloc_32); @@ -604,7 +612,7 @@ void *vmalloc_32_user(unsigned long size struct vm_struct *area; void *ret; - ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); + ret = __vmalloc(size, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL); if (ret) { write_lock(&vmlist_lock); area = __find_vm_area(ret);