[PATCH 10/17] mm: merge vmem_altmap_alloc into altmap_alloc_block_buf

Christoph Hellwig
2017-12-29T07:50:10Z

There is no clear separation between the two, so merge them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
---
mm/sparse-vmemmap.c | 45 ++++++++++++++++-----------------------------
1 file changed, 16 insertions(+), 29 deletions(-)

diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index d012c9e2811b..bd0276d5f66b 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -107,33 +107,16 @@ static unsigned long __meminit vmem_altmap_nr_free(struct vmem_altmap *altmap)
}

/**
- * vmem_altmap_alloc - allocate pages from the vmem_altmap reservation
- * @altmap - reserved page pool for the allocation
- * @nr_pfns - size (in pages) of the allocation
+ * altmap_alloc_block_buf - allocate pages from the device page map
+ * @altmap: device page map
+ * @size: size (in bytes) of the allocation
*
- * Allocations are aligned to the size of the request
+ * Allocations are aligned to the size of the request.
*/
-static unsigned long __meminit vmem_altmap_alloc(struct vmem_altmap *altmap,
- unsigned long nr_pfns)
-{
- unsigned long pfn = vmem_altmap_next_pfn(altmap);
- unsigned long nr_align;
-
- nr_align = 1UL << find_first_bit(&nr_pfns, BITS_PER_LONG);
- nr_align = ALIGN(pfn, nr_align) - pfn;
-
- if (nr_pfns + nr_align > vmem_altmap_nr_free(altmap))
- return ULONG_MAX;
- altmap->alloc += nr_pfns;
- altmap->align += nr_align;
- return pfn + nr_align;
-}
-
void * __meminit altmap_alloc_block_buf(unsigned long size,
struct vmem_altmap *altmap)
{
- unsigned long pfn, nr_pfns;
- void *ptr;
+ unsigned long pfn, nr_pfns, nr_align;

if (size & ~PAGE_MASK) {
pr_warn_once("%s: allocations must be multiple of PAGE_SIZE (%ld)\n",
@@ -141,16 +124,20 @@ void * __meminit altmap_alloc_block_buf(unsigned long size,
return NULL;
}

+ pfn = vmem_altmap_next_pfn(altmap);
nr_pfns = size >> PAGE_SHIFT;
- pfn = vmem_altmap_alloc(altmap, nr_pfns);
- if (pfn < ULONG_MAX)
- ptr = __va(__pfn_to_phys(pfn));
- else
- ptr = NULL;
+ nr_align = 1UL << find_first_bit(&nr_pfns, BITS_PER_LONG);
+ nr_align = ALIGN(pfn, nr_align) - pfn;
+ if (nr_pfns + nr_align > vmem_altmap_nr_free(altmap))
+ return NULL;
+
+ altmap->alloc += nr_pfns;
+ altmap->align += nr_align;
+ pfn += nr_align;
+
pr_debug("%s: pfn: %#lx alloc: %ld align: %ld nr: %#lx\n",
__func__, pfn, altmap->alloc, altmap->align, nr_pfns);
-
- return ptr;
+ return __va(__pfn_to_phys(pfn));
}

void __meminit vmemmap_verify(pte_t *pte, int node,