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authorDavid Howells <dhowells@redhat.com>2009-12-15 19:27:45 +0000
committerJames Morris <jmorris@namei.org>2009-12-17 09:25:19 +1100
commit6e1415467614e854fee660ff6648bd10fa976e95 (patch)
tree2ae2e2f51eff0629bc0e26a97eac85483a7ba56f /kernel
parentdd880fbe8e4792d1185a5101dc751f49eab0a509 (diff)
downloadop-kernel-dev-6e1415467614e854fee660ff6648bd10fa976e95.zip
op-kernel-dev-6e1415467614e854fee660ff6648bd10fa976e95.tar.gz
NOMMU: Optimise away the {dac_,}mmap_min_addr tests
In NOMMU mode clamp dac_mmap_min_addr to zero to cause the tests on it to be skipped by the compiler. We do this as the minimum mmap address doesn't make any sense in NOMMU mode. mmap_min_addr and round_hint_to_min() can be discarded entirely in NOMMU mode. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sysctl.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 45e4bef..856a24e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1214,6 +1214,7 @@ static struct ctl_table vm_table[] = {
.proc_handler = proc_dointvec_jiffies,
},
#endif
+#ifdef CONFIG_MMU
{
.procname = "mmap_min_addr",
.data = &dac_mmap_min_addr,
@@ -1221,6 +1222,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = mmap_min_addr_handler,
},
+#endif
#ifdef CONFIG_NUMA
{
.procname = "numa_zonelist_order",
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