zsmalloc: remove unnecessary size_class NULL check

pool->size_class array elements can't be NULL, so this check
is not needed.

In the whole code, we assign pool->size_class[i] values that are
not NULL. Releasing memory for these values occurs in the
zs_destroy_pool() function, which also releases and destroys the pool.

In addition, in the zs_stats_size_show() and async_free_zspage(),
with similar iterations over the array, we don't check it for NULL
pointer.

Link: https://lkml.kernel.org/r/20220811153755.16102-3-avromanov@sberdevices.ru
Signed-off-by: Alexey Romanov <avromanov@sberdevices.ru>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 09ab91a..7b3bffc 100644 (file)
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -2110,8 +2110,6 @@ unsigned long zs_compact(struct zs_pool *pool)
 
        for (i = ZS_SIZE_CLASSES - 1; i >= 0; i--) {
                class = pool->size_class[i];
-               if (!class)
-                       continue;
                if (class->index != i)
                        continue;
                pages_freed += __zs_compact(pool, class);
@@ -2156,8 +2154,6 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker,
 
        for (i = ZS_SIZE_CLASSES - 1; i >= 0; i--) {
                class = pool->size_class[i];
-               if (!class)
-                       continue;
                if (class->index != i)
                        continue;
 
@@ -2315,9 +2311,6 @@ void zs_destroy_pool(struct zs_pool *pool)
                int fg;
                struct size_class *class = pool->size_class[i];
 
-               if (!class)
-                       continue;
-
                if (class->index != i)
                        continue;