diff options
| author | David Howells <dhowells@redhat.com> | 2009-12-15 19:27:45 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-06 15:04:30 -0800 |
| commit | 0399123f3dcce1a515d021107ec0fb4413ca3efa (patch) | |
| tree | feb6247bb86bcb4ccaf179d086ccd95fff6f2c66 /mm | |
| parent | 1cfe005024b5c820f9b37c9045ec87ee75a8cfb6 (diff) | |
| download | lwn-0399123f3dcce1a515d021107ec0fb4413ca3efa.tar.gz lwn-0399123f3dcce1a515d021107ec0fb4413ca3efa.zip | |
NOMMU: Optimise away the {dac_,}mmap_min_addr tests
commit 6e1415467614e854fee660ff6648bd10fa976e95 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 44cf6f0a3a6d..2c19c0bac10e 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -227,6 +227,7 @@ config KSM config DEFAULT_MMAP_MIN_ADDR int "Low address space to protect from user allocation" + depends on MMU default 4096 help This is the portion of low virtual memory which should be protected |