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powerpc: Don't hard code the size of pte page

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USE PTRS_PER_PTE to indicate the size of pte page. To support THP,
later patches will be changing PTRS_PER_PTE value.

Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Aneesh Kumar K.V 2013-04-28 09:37:27 +00:00 committed by Benjamin Herrenschmidt
parent ce54152f42
commit cc3665a60a
2 changed files with 8 additions and 2 deletions
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6
arch/powerpc/include/asm/pgtable.h
View file

@ -17,6 +17,12 @@ struct mm_struct;
# include <asm/pgtable-ppc32.h>
#endif
/*
* We save the slot number & secondary bit in the second half of the
* PTE page. We use the 8 bytes per each pte entry.
*/
#define PTE_PAGE_HIDX_OFFSET (PTRS_PER_PTE * 8)
#ifndef __ASSEMBLY__
#include <asm/tlbflush.h>

4
arch/powerpc/mm/hash_low_64.S
View file

@ -490,7 +490,7 @@ END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)
beq htab_inval_old_hpte
ld r6,STK_PARAM(R6)(r1)
ori r26,r6,0x8000 /* Load the hidx mask */
ori r26,r6,PTE_PAGE_HIDX_OFFSET /* Load the hidx mask. */
ld r26,0(r26)
addi r5,r25,36 /* Check actual HPTE_SUB bit, this */
rldcr. r0,r31,r5,0 /* must match pgtable.h definition */
@ -607,7 +607,7 @@ htab_pte_insert_ok:
sld r4,r4,r5
andc r26,r26,r4
or r26,r26,r3
ori r5,r6,0x8000
ori r5,r6,PTE_PAGE_HIDX_OFFSET
std r26,0(r5)
lwsync
std r30,0(r6)