fs: don't compile in drop_caches.c when CONFIG_SYSCTL=n

drop_caches.c provides code only invokable via sysctl, so don't compile it
in when CONFIG_SYSCTL=n.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/Makefile b/fs/Makefile
index 9d53192..3b2c767 100644 (file)
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -10,7 +10,7 @@ obj-y :=      open.o read_write.o file_table.o super.o \
                ioctl.o readdir.o select.o fifo.o dcache.o inode.o \
                attr.o bad_inode.o file.o filesystems.o namespace.o \
                seq_file.o xattr.o libfs.o fs-writeback.o \
-               pnode.o drop_caches.o splice.o sync.o utimes.o \
+               pnode.o splice.o sync.o utimes.o \
                stack.o fs_struct.o statfs.o
 
 ifeq ($(CONFIG_BLOCK),y)
@@ -49,6 +49,7 @@ obj-$(CONFIG_FS_POSIX_ACL)    += posix_acl.o xattr_acl.o
 obj-$(CONFIG_NFS_COMMON)       += nfs_common/
 obj-$(CONFIG_GENERIC_ACL)      += generic_acl.o
 obj-$(CONFIG_COREDUMP)         += coredump.o
+obj-$(CONFIG_SYSCTL)           += drop_caches.o
 
 obj-$(CONFIG_FHANDLE)          += fhandle.o
 

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 43b70d5..98a4437 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1731,8 +1731,12 @@ int in_gate_area_no_mm(unsigned long addr);
 #define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);})
 #endif /* __HAVE_ARCH_GATE_AREA */
 
+#ifdef CONFIG_SYSCTL
+extern int sysctl_drop_caches;
 int drop_caches_sysctl_handler(struct ctl_table *, int,
                                        void __user *, size_t *, loff_t *);
+#endif
+
 unsigned long shrink_slab(struct shrink_control *shrink,
                          unsigned long nr_pages_scanned,
                          unsigned long lru_pages);

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index afc1dc6..3dadde5 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -106,7 +106,6 @@ extern unsigned int core_pipe_limit;
 #endif
 extern int pid_max;
 extern int pid_max_min, pid_max_max;
-extern int sysctl_drop_caches;
 extern int percpu_pagelist_fraction;
 extern int compat_log;
 extern int latencytop_enabled;