mm: remove redundant K() macro definition

Patch series "cleanup with helper macro K()".

Use helper macro K() to improve code readability.  No functional
modification involved.  Remove redundant K() macro definition.


This patch (of 7):

Since commit eb8589b ("mm: move mem_init_print_info() to mm_init.c"),
the K() macro definition has been moved to mm/internal.h.  Therefore, the
definitions in mm/memcontrol.c, mm/backing-dev.c and mm/oom_kill.c are
redundant.  Drop redundant definitions.

[akpm@linux-foundation.org: oom_kill.c: remove "#undef K", per Kefeng]
Link: https://lkml.kernel.org/r/20230804012559.2617515-1-zhangpeng362@huawei.com
Link: https://lkml.kernel.org/r/20230804012559.2617515-2-zhangpeng362@huawei.com
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/backing-dev.c

@@ -16,6 +16,7 @@
 #include <linux/writeback.h>
 #include <linux/device.h>
 #include <trace/events/writeback.h>
+#include "internal.h"
 
 struct backing_dev_info noop_backing_dev_info;
 EXPORT_SYMBOL_GPL(noop_backing_dev_info);
@@ -34,8 +35,6 @@ LIST_HEAD(bdi_list);
 /* bdi_wq serves all asynchronous writeback tasks */
 struct workqueue_struct *bdi_wq;
 
-#define K(x) ((x) << (PAGE_SHIFT - 10))
-
 #ifdef CONFIG_DEBUG_FS
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>

mm/memcontrol.c

@@ -1629,7 +1629,6 @@ static void memory_stat_format(struct mem_cgroup *memcg, struct seq_buf *s)
 	WARN_ON_ONCE(seq_buf_has_overflowed(s));
 }
 
-#define K(x) ((x) << (PAGE_SHIFT-10))
 /**
  * mem_cgroup_print_oom_context: Print OOM information relevant to
  * memory controller.

mm/oom_kill.c

@@ -479,8 +479,6 @@ static DECLARE_WAIT_QUEUE_HEAD(oom_victims_wait);
 
 static bool oom_killer_disabled __read_mostly;
 
-#define K(x) ((x) << (PAGE_SHIFT-10))
-
 /*
  * task->mm can be NULL if the task is the exited group leader.  So to
  * determine whether the task is using a particular mm, we examine all the
@@ -994,7 +992,6 @@ static void __oom_kill_process(struct task_struct *victim, const char *message)
 	mmdrop(mm);
 	put_task_struct(victim);
 }
-#undef K
 
 /*
  * Kill provided task unless it's secured by setting