eliminate special FLUSH flag from page table
This was used to flush a region even if the page table entry had been
cleared. In theory this was never necessary, but now we've switched to
alias based flushing, the whole set of code associated with it can be dumped.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index 865f37a..f3c0973 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -136,8 +136,7 @@
#define _PAGE_NO_CACHE_BIT 24 /* (0x080) Uncached Page (U bit) */
#define _PAGE_ACCESSED_BIT 23 /* (0x100) Software: Page Accessed */
#define _PAGE_PRESENT_BIT 22 /* (0x200) Software: translation valid */
-#define _PAGE_FLUSH_BIT 21 /* (0x400) Software: translation valid */
- /* for cache flushing only */
+/* bit 21 was formerly the FLUSH bit but is now unused */
#define _PAGE_USER_BIT 20 /* (0x800) Software: User accessible page */
/* N.B. The bits are defined in terms of a 32 bit word above, so the */
@@ -171,7 +170,6 @@
#define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT))
#define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT))
#define _PAGE_PRESENT (1 << xlate_pabit(_PAGE_PRESENT_BIT))
-#define _PAGE_FLUSH (1 << xlate_pabit(_PAGE_FLUSH_BIT))
#define _PAGE_USER (1 << xlate_pabit(_PAGE_USER_BIT))
#define _PAGE_FILE (1 << xlate_pabit(_PAGE_FILE_BIT))
@@ -211,7 +209,6 @@
#define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL & ~_PAGE_WRITE)
#define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
#define PAGE_GATEWAY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ)
-#define PAGE_FLUSH __pgprot(_PAGE_FLUSH)
/*
@@ -259,7 +256,7 @@
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
-#define pte_none(x) ((pte_val(x) == 0) || (pte_val(x) & _PAGE_FLUSH))
+#define pte_none(x) (pte_val(x) == 0)
#define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
#define pte_clear(mm,addr,xp) do { pte_val(*(xp)) = 0; } while (0)
@@ -442,13 +439,10 @@
static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_t old_pte;
- pte_t pte;
spin_lock(&pa_dbit_lock);
- pte = old_pte = *ptep;
- pte_val(pte) &= ~_PAGE_PRESENT;
- pte_val(pte) |= _PAGE_FLUSH;
- set_pte_at(mm,addr,ptep,pte);
+ old_pte = *ptep;
+ pte_clear(mm,addr,ptep);
spin_unlock(&pa_dbit_lock);
return old_pte;