mm: alloc_contig_range: allow to specify GFP mask

Currently alloc_contig_range assumes that the compaction should be done
with the default GFP_KERNEL flags.  This is probably right for all
current uses of this interface, but may change as CMA is used in more
use-cases (including being the default DMA memory allocator on some
platforms).

Change the function prototype, to allow for passing through the GFP mask
set by upper layers.

Also respect global restrictions by applying memalloc_noio_flags to the
passed in flags.

Link: http://lkml.kernel.org/r/20170127172328.18574-1-l.stach@pengutronix.de
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Radim Krcmar <rkrcmar@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Alexander Graf <agraf@suse.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 0fe0b6295ab58edfe6745467487fe19beba0d723..db373b9d322361f7553cfbe36026d918fb9d09ee 100644 (file)
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -541,7 +541,7 @@ static inline bool pm_suspended_storage(void)
 #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA)
 /* The below functions must be run on a range from a single zone. */
 extern int alloc_contig_range(unsigned long start, unsigned long end,
-                             unsigned migratetype);
+                             unsigned migratetype, gfp_t gfp_mask);
 extern void free_contig_range(unsigned long pfn, unsigned nr_pages);
 #endif
 

diff --git a/mm/cma.c b/mm/cma.c
index 94b3460cd608aa26163ef84f99123d74c4a2d657..c6aed23ca6dfce60b450cac320e1035b0693f06c 100644 (file)
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -402,7 +402,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align)
 
                pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit);
                mutex_lock(&cma_mutex);
-               ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA);
+               ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA,
+                                        GFP_KERNEL);
                mutex_unlock(&cma_mutex);
                if (ret == 0) {
                        page = pfn_to_page(pfn);

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 167fd0722c15eaccbac571911bb2b3ecbdb62668..2e0e8159ce8e06652f43890ffe3d7f2e0a5665f9 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1052,7 +1052,8 @@ static int __alloc_gigantic_page(unsigned long start_pfn,
                                unsigned long nr_pages)
 {
        unsigned long end_pfn = start_pfn + nr_pages;
-       return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
+       return alloc_contig_range(start_pfn, end_pfn, MIGRATE_MOVABLE,
+                                 GFP_KERNEL);
 }
 
 static bool pfn_range_valid_gigantic(struct zone *z,

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2d34cdb70f1dffebc268e310362105e3b7d4fa9c..8a0f3362433504f25de1763ce0b42e2b86661b37 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7399,6 +7399,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
  *                     #MIGRATE_MOVABLE or #MIGRATE_CMA).  All pageblocks
  *                     in range must have the same migratetype and it must
  *                     be either of the two.
+ * @gfp_mask:  GFP mask to use during compaction
  *
  * The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES
  * aligned, however it's the caller's responsibility to guarantee that
@@ -7412,7 +7413,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
  * need to be freed with free_contig_range().
  */
 int alloc_contig_range(unsigned long start, unsigned long end,
-                      unsigned migratetype)
+                      unsigned migratetype, gfp_t gfp_mask)
 {
        unsigned long outer_start, outer_end;
        unsigned int order;
@@ -7424,7 +7425,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
                .zone = page_zone(pfn_to_page(start)),
                .mode = MIGRATE_SYNC,
                .ignore_skip_hint = true,
-               .gfp_mask = GFP_KERNEL,
+               .gfp_mask = memalloc_noio_flags(gfp_mask),
        };
        INIT_LIST_HEAD(&cc.migratepages);