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authorDavid S. Miller <davem@davemloft.net>2013-09-18 14:22:34 -0700
committerDavid S. Miller <davem@davemloft.net>2013-11-12 15:22:33 -0800
commite0a45e3580a033669b24b04c3535515d69bb9702 (patch)
treeab6910d1bc0fc84ad9eafdb65d2ed39918485f51 /arch/sparc
parent922631b988d8cbb821ebe2c67feffc0b95264894 (diff)
downloadlinux-e0a45e3580a033669b24b04c3535515d69bb9702.tar.bz2
sparc64: Define PAGE_OFFSET in terms of physical address bits.
This makes clearer the implications for a given choosen value. Based upon patches by Bob Picco. Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Bob Picco <bob.picco@oracle.com>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/include/asm/page_64.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/page_64.h b/arch/sparc/include/asm/page_64.h
index d95931247feb..9dd0f7360822 100644
--- a/arch/sparc/include/asm/page_64.h
+++ b/arch/sparc/include/asm/page_64.h
@@ -117,7 +117,9 @@ typedef pte_t *pgtable_t;
/* We used to stick this into a hard-coded global register (%g4)
* but that does not make sense anymore.
*/
-#define PAGE_OFFSET _AC(0xFFFFF80000000000,UL)
+#define MAX_SUPPORTED_PA_BITS 43
+#define PAGE_OFFSET_BY_BITS(X) (-(_AC(1,UL) << (X)))
+#define PAGE_OFFSET PAGE_OFFSET_BY_BITS(MAX_SUPPORTED_PA_BITS)
#ifndef __ASSEMBLY__