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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-09-23 14:00:40 -0700
committerIngo Molnar <mingo@elte.hu>2008-10-10 19:29:15 +0200
commit55121b4369ced87863bf04da1f762a37e58aee4d (patch)
tree2457540a64011581ac4510cfeeba27399c4f92ae /arch/x86
parent0b8fdcbcd287a1fbe66817491e6149841ae25705 (diff)
x86, cpa: no need to check alias for __set_pages_p/__set_pages_np
No alias checking needed for setting present/not-present mapping. Otherwise, we may need to break large pages for 64-bit kernel text mappings (this adds to complexity if we want to do this from atomic context especially, for ex: with CONFIG_DEBUG_PAGEALLOC). Let's keep it simple! Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: arjan@linux.intel.com Cc: venkatesh.pallipadi@intel.com Cc: jeremy@goop.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/mm/pageattr.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 4b6968ba086..162812b05d2 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1121,7 +1121,13 @@ static int __set_pages_p(struct page *page, int numpages)
.mask_clr = __pgprot(0),
.flags = 0};
- return __change_page_attr_set_clr(&cpa, 1);
+ /*
+ * No alias checking needed for setting present flag. otherwise,
+ * we may need to break large pages for 64-bit kernel text
+ * mappings (this adds to complexity if we want to do this from
+ * atomic context especially). Let's keep it simple!
+ */
+ return __change_page_attr_set_clr(&cpa, 0);
}
static int __set_pages_np(struct page *page, int numpages)
@@ -1133,7 +1139,13 @@ static int __set_pages_np(struct page *page, int numpages)
.mask_clr = __pgprot(_PAGE_PRESENT | _PAGE_RW),
.flags = 0};
- return __change_page_attr_set_clr(&cpa, 1);
+ /*
+ * No alias checking needed for setting not present flag. otherwise,
+ * we may need to break large pages for 64-bit kernel text
+ * mappings (this adds to complexity if we want to do this from
+ * atomic context especially). Let's keep it simple!
+ */
+ return __change_page_attr_set_clr(&cpa, 0);
}
void kernel_map_pages(struct page *page, int numpages, int enable)
@@ -1153,11 +1165,8 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
/*
* The return value is ignored as the calls cannot fail.
- * Large pages are kept enabled at boot time, and are
- * split up quickly with DEBUG_PAGEALLOC. If a splitup
- * fails here (due to temporary memory shortage) no damage
- * is done because we just keep the largepage intact up
- * to the next attempt when it will likely be split up:
+ * Large pages for identity mappings are not used at boot time
+ * and hence no memory allocations during large page split.
*/
if (enable)
__set_pages_p(page, numpages);