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SubjectRe: Regression after commit 19809c2da28a ("mm, vmalloc: use __GFP_HIGHMEM implicitly")
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Hi Matthew,

> On Feb 9, 2018, at 12:08 PM, Matthew Wilcox <willy@infradead.org> wrote:
> Alternatively, try this. It passes in GFP_DMA32 from vmalloc_32,
> regardless of whether ZONE_DMA32 exists or not. If ZONE_DMA32 doesn't
> exist, then we clear it in __vmalloc_area_node(), after using it to
> determine that we shouldn't set __GFP_HIGHMEM.

IIUC, I need to let drivers/media drivers start using vmalloc_32() with
your patch, right?

Kai-Heng

>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 673942094328..91e8a95123c4 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -1669,10 +1669,11 @@ static void *__vmalloc_area_node(struct vm_struct
> *area, gfp_t gfp_mask,
> struct page **pages;
> unsigned int nr_pages, array_size, i;
> const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
> - const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;
> - const gfp_t highmem_mask = (gfp_mask & (GFP_DMA | GFP_DMA32)) ?
> - 0 :
> - __GFP_HIGHMEM;
> + gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;
> + if (!(alloc_mask & GFP_ZONEMASK))
> + alloc_mask |= __GFP_HIGHMEM;
> + if (!IS_ENABLED(CONFIG_ZONE_DMA32) && (alloc_mask & __GFP_DMA32))
> + alloc_mask &= ~__GFP_DMA32;
>
> nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
> array_size = (nr_pages * sizeof(struct page *));
> @@ -1680,7 +1681,7 @@ static void *__vmalloc_area_node(struct vm_struct
> *area, gfp_t gfp_mask,
> area->nr_pages = nr_pages;
> /* Please note that the recursion is strictly bounded. */
> if (array_size > PAGE_SIZE) {
> - pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask,
> + pages = __vmalloc_node(array_size, 1, nested_gfp|__GFP_HIGHMEM,
> PAGE_KERNEL, node, area->caller);
> } else {
> pages = kmalloc_node(array_size, nested_gfp, node);
> @@ -1696,9 +1697,9 @@ static void *__vmalloc_area_node(struct vm_struct
> *area, gfp_t gfp_mask,
> struct page *page;
>
> if (node == NUMA_NO_NODE)
> - page = alloc_page(alloc_mask|highmem_mask);
> + page = alloc_page(alloc_mask);
> else
> - page = alloc_pages_node(node, alloc_mask|highmem_mask, 0);
> + page = alloc_pages_node(node, alloc_mask, 0);
>
> if (unlikely(!page)) {
> /* Successfully allocated i pages, free them in __vunmap() */
> @@ -1706,7 +1707,7 @@ static void *__vmalloc_area_node(struct vm_struct
> *area, gfp_t gfp_mask,
> goto fail;
> }
> area->pages[i] = page;
> - if (gfpflags_allow_blocking(gfp_mask|highmem_mask))
> + if (gfpflags_allow_blocking(gfp_mask))
> cond_resched();
> }
>
> @@ -1942,12 +1943,10 @@ void *vmalloc_exec(unsigned long size)
> NUMA_NO_NODE, __builtin_return_address(0));
> }
>
> -#if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
> -#define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL
> -#elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
> +#if defined(CONFIG_64BIT) && !defined(CONFIG_ZONE_DMA32)
> #define GFP_VMALLOC32 GFP_DMA | GFP_KERNEL
> #else
> -#define GFP_VMALLOC32 GFP_KERNEL
> +#define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL
> #endif
>
> /**

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