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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2008-08-06 15:12:22 +0200
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-09-29 17:56:57 -0400
commitbfcd17a6c5529bc37234cfa720a047cf9397bcfc (patch)
treef4e087479a8c559f1a5ca3be96c64afd172e12c1 /kernel
parent04716e6621ff4abb422d64ba7b48718f52716a3e (diff)
downloadop-kernel-dev-bfcd17a6c5529bc37234cfa720a047cf9397bcfc.zip
op-kernel-dev-bfcd17a6c5529bc37234cfa720a047cf9397bcfc.tar.gz
Configure out file locking features
This patch adds the CONFIG_FILE_LOCKING option which allows to remove support for advisory locks. With this patch enabled, the flock() system call, the F_GETLK, F_SETLK and F_SETLKW operations of fcntl() and NFS support are disabled. These features are not necessarly needed on embedded systems. It allows to save ~11 Kb of kernel code and data: text data bss dec hex filename 1125436 118764 212992 1457192 163c28 vmlinux.old 1114299 118564 212992 1445855 160fdf vmlinux -11137 -200 0 -11337 -2C49 +/- This patch has originally been written by Matt Mackall <mpm@selenic.com>, and is part of the Linux Tiny project. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Matt Mackall <mpm@selenic.com> Cc: matthew@wil.cx Cc: linux-fsdevel@vger.kernel.org Cc: mpm@selenic.com Cc: akpm@linux-foundation.org Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sys_ni.c1
-rw-r--r--kernel/sysctl.c6
2 files changed, 6 insertions, 1 deletions
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 08d6e1b..503d8d4 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -125,6 +125,7 @@ cond_syscall(sys_vm86old);
cond_syscall(sys_vm86);
cond_syscall(compat_sys_ipc);
cond_syscall(compat_sys_sysctl);
+cond_syscall(sys_flock);
/* arch-specific weak syscall entries */
cond_syscall(sys_pciconfig_read);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 50ec088..4588b2c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -97,7 +97,7 @@ static int sixty = 60;
static int neg_one = -1;
#endif
-#ifdef CONFIG_MMU
+#if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
static int two = 2;
#endif
@@ -1261,6 +1261,7 @@ static struct ctl_table fs_table[] = {
.extra1 = &minolduid,
.extra2 = &maxolduid,
},
+#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASES,
.procname = "leases-enable",
@@ -1269,6 +1270,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+#endif
#ifdef CONFIG_DNOTIFY
{
.ctl_name = FS_DIR_NOTIFY,
@@ -1280,6 +1282,7 @@ static struct ctl_table fs_table[] = {
},
#endif
#ifdef CONFIG_MMU
+#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASE_TIME,
.procname = "lease-break-time",
@@ -1291,6 +1294,7 @@ static struct ctl_table fs_table[] = {
.extra1 = &zero,
.extra2 = &two,
},
+#endif
{
.procname = "aio-nr",
.data = &aio_nr,
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