mm: slabinfo: remove CONFIG_SLABINFO

According to discussion with Christoph
(https://marc.info/?l=linux-kernel&m=150695909709711&w=2), it sounds like
it is pointless to keep CONFIG_SLABINFO around.

This patch removes the CONFIG_SLABINFO config option, but /proc/slabinfo
is still available.

[yang.s@alibaba-inc.com: v11]
Link: http://lkml.kernel.org/r/1507656303-103845-3-git-send-email-yang.s@alibaba-inc.com
Link: http://lkml.kernel.org/r/1507152550-46205-3-git-send-email-yang.s@alibaba-inc.com
Signed-off-by: Yang Shi <yang.s@alibaba-inc.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/init/Kconfig b/init/Kconfig
index 2431e05..9b8c187 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1664,12 +1664,6 @@ config HAVE_GENERIC_DMA_COHERENT
        bool
        default n
 
-config SLABINFO
-       bool
-       depends on PROC_FS
-       depends on SLAB || SLUB_DEBUG
-       default y
-
 config RT_MUTEXES
        bool
 

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 661f046..50e6906 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4049,7 +4049,7 @@ static struct cftype mem_cgroup_legacy_files[] = {
                .write = mem_cgroup_reset,
                .read_u64 = mem_cgroup_read_u64,
        },
-#ifdef CONFIG_SLABINFO
+#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
        {
                .name = "kmem.slabinfo",
                .seq_start = memcg_slab_start,

diff --git a/mm/slab.c b/mm/slab.c
index b709588..1a6797e 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4097,7 +4097,6 @@ out:
        schedule_delayed_work(work, round_jiffies_relative(REAPTIMEOUT_AC));
 }
 
-#ifdef CONFIG_SLABINFO
 void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo)
 {
        unsigned long active_objs, num_objs, active_slabs;
@@ -4405,7 +4404,6 @@ static int __init slab_proc_init(void)
        return 0;
 }
 module_init(slab_proc_init);
-#endif
 
 #ifdef CONFIG_HARDENED_USERCOPY
 /*

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 0d7fe71..9357353 100644 (file)
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1184,8 +1184,7 @@ void cache_random_seq_destroy(struct kmem_cache *cachep)
 }
 #endif /* CONFIG_SLAB_FREELIST_RANDOM */
 
-#ifdef CONFIG_SLABINFO
-
+#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
 #ifdef CONFIG_SLAB
 #define SLABINFO_RIGHTS (S_IWUSR | S_IRUSR)
 #else
@@ -1281,7 +1280,7 @@ static int slab_show(struct seq_file *m, void *p)
        return 0;
 }
 
-#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
+#if defined(CONFIG_MEMCG)
 void *memcg_slab_start(struct seq_file *m, loff_t *pos)
 {
        struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
@@ -1355,7 +1354,7 @@ static int __init slab_proc_init(void)
        return 0;
 }
 module_init(slab_proc_init);
-#endif /* CONFIG_SLABINFO */
+#endif /* CONFIG_SLAB || CONFIG_SLUB_DEBUG */
 
 static __always_inline void *__do_krealloc(const void *p, size_t new_size,
                                           gfp_t flags)

diff --git a/mm/slub.c b/mm/slub.c
index 1efbb81..025bbb5 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5852,7 +5852,7 @@ __initcall(slab_sysfs_init);
 /*
  * The /proc/slabinfo ABI
  */
-#ifdef CONFIG_SLABINFO
+#ifdef CONFIG_SLUB_DEBUG
 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo)
 {
        unsigned long nr_slabs = 0;
@@ -5884,4 +5884,4 @@ ssize_t slabinfo_write(struct file *file, const char __user *buffer,
 {
        return -EIO;
 }
-#endif /* CONFIG_SLABINFO */
+#endif /* CONFIG_SLUB_DEBUG */