# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1248267981 -3600
# Node ID 5adc108c0085c6901e67d0b7ceebb1022c2c0ffd
# Parent 091036b8dbb9420a1bb0aaf2dc793c268371b0e9
page allocator: add mfn_valid() check to free_heap_pages() and scrub_pages()
The changesets, 19913:ef38784f9f85 and 19914:d6c1d7992f43 eliminates
boot allocator bitmap which is also used for buddy allocator bitmap.
With those patches, xen/ia64 doesn't boot because page allocator
touches struct page_info which doesn't exist.
That happends because memory is populated sparsely on ia64
and struct page_info is so.
This patches fixes ia64 boot failure.
In fact, this is also a potential bug on x86. max_page seems
to be well aligned so that MAX_ORDER loop check prevented
to be bug appear.
- fix free_heap_pages().
When merging chunks, buddy page_info() doesn't always exists.
So check it by mfn_valid().
- fix scrub_pages()
On ia64 page_info() is sparsely populated, so struct page_info
doesn't always exist. Check it by mfn_valid()
- offline_pages(), online_pages() and query_page_offline()
Also replace "< max_page" check with mfn_valid() for consistency.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
xen/common/page_alloc.c | 14 ++++++++------
1 files changed, 8 insertions(+), 6 deletions(-)
diff -r 091036b8dbb9 -r 5adc108c0085 xen/common/page_alloc.c
--- a/xen/common/page_alloc.c Wed Jul 22 14:05:26 2009 +0100
+++ b/xen/common/page_alloc.c Wed Jul 22 14:06:21 2009 +0100
@@ -507,7 +507,8 @@ static void free_heap_pages(
if ( (page_to_mfn(pg) & mask) )
{
/* Merge with predecessor block? */
- if ( !page_state_is(pg-mask, free) ||
+ if ( !mfn_valid(page_to_mfn(pg-mask)) ||
+ !page_state_is(pg-mask, free) ||
(PFN_ORDER(pg-mask) != order) )
break;
pg -= mask;
@@ -516,7 +517,8 @@ static void free_heap_pages(
else
{
/* Merge with successor block? */
- if ( !page_state_is(pg+mask, free) ||
+ if ( !mfn_valid(page_to_mfn(pg+mask)) ||
+ !page_state_is(pg+mask, free) ||
(PFN_ORDER(pg+mask) != order) )
break;
page_list_del(pg + mask, &heap(node, zone, order));
@@ -608,7 +610,7 @@ int offline_page(unsigned long mfn, int
int ret = 0;
struct page_info *pg;
- if ( mfn > max_page )
+ if ( mfn_valid(mfn) )
{
dprintk(XENLOG_WARNING,
"try to offline page out of range %lx\n", mfn);
@@ -694,7 +696,7 @@ unsigned int online_page(unsigned long m
struct page_info *pg;
int ret;
- if ( mfn > max_page )
+ if ( !mfn_valid(mfn) )
{
dprintk(XENLOG_WARNING, "call expand_pages() first\n");
return -EINVAL;
@@ -745,7 +747,7 @@ int query_page_offline(unsigned long mfn
{
struct page_info *pg;
- if ( (mfn > max_page) || !page_is_ram_type(mfn, RAM_TYPE_CONVENTIONAL) )
+ if ( !mfn_valid(mfn) || !page_is_ram_type(mfn, RAM_TYPE_CONVENTIONAL) )
{
dprintk(XENLOG_WARNING, "call expand_pages() first\n");
return -EINVAL;
@@ -886,7 +888,7 @@ void __init scrub_heap_pages(void)
pg = mfn_to_page(mfn);
/* Quick lock-free check. */
- if ( !page_state_is(pg, free) )
+ if ( !mfn_valid(mfn) || !page_state_is(pg, free) )
continue;
/* Every 100MB, print a progress dot. */
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