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authorJosh Triplett <josh@joshtriplett.org>2013-04-29 15:07:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-29 15:54:33 -0700
commit146732ce104ddfed3d4d82722c0b336074016b92 (patch)
tree07185bc6ff143cc669cc9e0a197a3adf0c13004a
parent6d2488f64a240191f0733c1f32d73607916b01b7 (diff)
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>
-rw-r--r--fs/Makefile3
-rw-r--r--include/linux/mm.h4
-rw-r--r--kernel/sysctl.c1
3 files changed, 6 insertions, 2 deletions
diff --git a/fs/Makefile b/fs/Makefile
index 9d53192236fc..3b2c76759ec9 100644
--- 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 43b70d5f8201..98a44376e4f3 100644
--- 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 afc1dc60f3f8..3dadde52253c 100644
--- 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;