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powerpc: Free a PTE bit on ppc64 with 64K pages

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This frees a PTE bit when using 64K pages on ppc64.  This is done
by getting rid of the separate _PAGE_HASHPTE bit.  Instead, we just test
if any of the 16 sub-page bits is set.  For non-combo pages (ie. real
64K pages), we set SUB0 and the location encoding in that field.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2008-06-11 15:37:10 +10:00
committed by Paul Mackerras
parent ff1f4ee94c
commit 41743a4e34
5 changed files with 31 additions and 13 deletions
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8
arch/powerpc/mm/hugetlbpage.c
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@ -458,8 +458,7 @@ int hash_huge_page(struct mm_struct *mm, unsigned long access,
old_pte = pte_val(*ptep);
if (old_pte & _PAGE_BUSY)
goto out;
new_pte = old_pte | _PAGE_BUSY |
_PAGE_ACCESSED | _PAGE_HASHPTE;
new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
} while(old_pte != __cmpxchg_u64((unsigned long *)ptep,
old_pte, new_pte));
@ -499,8 +498,11 @@ repeat:
HPTES_PER_GROUP) & ~0x7UL;
/* clear HPTE slot informations in new PTE */
#ifdef CONFIG_PPC_64K_PAGES
new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HPTE_SUB0;
#else
new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | _PAGE_HASHPTE;
#endif
/* Add in WIMG bits */
/* XXX We should store these in the pte */
/* --BenH: I think they are ... */