diff options
| -rw-r--r-- | mm/vmscan.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 03822f86f288..a00d94530e57 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -65,12 +65,6 @@ struct scan_control { /* How many pages shrink_list() should reclaim */ unsigned long nr_to_reclaim; - /* This context's GFP mask */ - gfp_t gfp_mask; - - /* Allocation order */ - int order; - /* * Nodemask of nodes allowed by the caller. If NULL, all nodes * are scanned. @@ -83,12 +77,6 @@ struct scan_control { */ struct mem_cgroup *target_mem_cgroup; - /* Scan (total_size >> priority) pages at once */ - int priority; - - /* The highest zone to isolate pages for reclaim from */ - enum zone_type reclaim_idx; - /* Writepage batching in laptop mode; RECLAIM_WRITE */ unsigned int may_writepage:1; @@ -111,6 +99,18 @@ struct scan_control { /* One of the zones is ready for compaction */ unsigned int compaction_ready:1; + /* Allocation order */ + s8 order; + + /* Scan (total_size >> priority) pages at once */ + s8 priority; + + /* The highest zone to isolate pages for reclaim from */ + s8 reclaim_idx; + + /* This context's GFP mask */ + gfp_t gfp_mask; + /* Incremented by the number of inactive pages that were scanned */ unsigned long nr_scanned; @@ -3064,6 +3064,14 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order, }; /* + * scan_control uses s8 fields for order, priority, and reclaim_idx. + * Confirm they are large enough for max values. + */ + BUILD_BUG_ON(MAX_ORDER > S8_MAX); + BUILD_BUG_ON(DEF_PRIORITY > S8_MAX); + BUILD_BUG_ON(MAX_NR_ZONES > S8_MAX); + + /* * Do not enter reclaim if fatal signal was delivered while throttled. * 1 is returned so that the page allocator does not OOM kill at this * point. |