[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 9/9] xen: support RAM at addresses 0 and 4096
Currently the mapping from pages to zones causes the page at zero to go into zone -1 and the page at 4096 to go into zone 0, which is the Xen zone (confusing various assertions). Arrange instead for the mapping to be such that zone 0 is always reserved for Xen and all other pages map to a zone >= 1. Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx> Cc: keir@xxxxxxx Cc: jbeulich@xxxxxxxx --- v2: fixup my arithmetic --- xen/common/page_alloc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 41251b2..fb8187b 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -257,11 +257,11 @@ unsigned long __init alloc_boot_pages( */ #define MEMZONE_XEN 0 -#define NR_ZONES (PADDR_BITS - PAGE_SHIFT) +#define NR_ZONES (PADDR_BITS - PAGE_SHIFT + 1) -#define bits_to_zone(b) (((b) < (PAGE_SHIFT + 1)) ? 0 : ((b) - PAGE_SHIFT - 1)) +#define bits_to_zone(b) (((b) < (PAGE_SHIFT + 1)) ? 1 : ((b) - PAGE_SHIFT)) #define page_to_zone(pg) (is_xen_heap_page(pg) ? MEMZONE_XEN : \ - (fls(page_to_mfn(pg)) - 1)) + (fls(page_to_mfn(pg)) ? : 1)) typedef struct page_list_head heap_by_zone_and_order_t[NR_ZONES][MAX_ORDER+1]; static heap_by_zone_and_order_t *_heap[MAX_NUMNODES]; -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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