mm: remove is_migrate_highatomic()

There are 3 potential reasons for is_migrate_*() helpers:

1. They represent higher-level attributes of migratetypes, like
   is_migrate_movable()

2. They are ifdef'd, like is_migrate_isolate().

3. For consistency with an is_migrate_*_page() helper, also like
   is_migrate_isolate().

It looks like is_migrate_highatomic() was for case 3, but that was
removed in commit e0932b6c1f94 ("mm: page_alloc: consolidate free page
accounting").

So remove the indirection and go back to a simple comparison.

Link: https://lkml.kernel.org/r/20250821-is-migrate-highatomic-v1-1-ddb6e5d7c566@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: SeongJae Park <sj@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/internal.h b/mm/internal.h
index 45b725c3dc030cb22a3cb0ddb262b6300e65ed5a..45da9ff5694f628db18f740718f0a7a06c4548f0 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1333,11 +1333,6 @@ extern const struct trace_print_flags pageflag_names[];
 extern const struct trace_print_flags vmaflag_names[];
 extern const struct trace_print_flags gfpflag_names[];
 
-static inline bool is_migrate_highatomic(enum migratetype migratetype)
-{
-       return migratetype == MIGRATE_HIGHATOMIC;
-}
-
 void setup_zone_pageset(struct zone *zone);
 
 struct migration_target_control {

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ca9e6b9633f79ff28448a6008749fa6ca2696332..baead29b3e67bb3ae2291b00d7632aaf87ebcc4c 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -797,7 +797,7 @@ static inline void account_freepages(struct zone *zone, int nr_pages,
 
        if (is_migrate_cma(migratetype))
                __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, nr_pages);
-       else if (is_migrate_highatomic(migratetype))
+       else if (migratetype == MIGRATE_HIGHATOMIC)
                WRITE_ONCE(zone->nr_free_highatomic,
                           zone->nr_free_highatomic + nr_pages);
 }