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sparc64: Define PAGE_OFFSET in terms of physical address bits.

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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>
This commit is contained in:
David S. Miller 2013-09-18 14:22:34 -07:00
parent 922631b988
commit e0a45e3580
1 changed files with 3 additions and 1 deletions
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4
arch/sparc/include/asm/page_64.h
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@ -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__