From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sun, 14 Dec 2008 19:44:51 +0000 (+0000)
Subject: powerpc/mm: Remove flush_HPTE()
X-Git-Tag: v3.0~11525^2~55
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f63837f0581fe580168ae1a7d178ded935411747;p=platform%2Fkernel%2Flinux-amlogic.git

powerpc/mm: Remove flush_HPTE()

The function flush_HPTE() is used in only one place, the implementation
of DEBUG_PAGEALLOC on ppc32.

It's actually a dup of flush_tlb_page() though it's -slightly- more
efficient on hash based processors.  We remove it and replace it by
a direct call to the hash flush code on those processors and to
flush_tlb_page() for everybody else.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index fab3cfa..b4344fd 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -58,17 +58,14 @@ extern phys_addr_t lowmem_end_addr;
  * architectures.  -- Dan
  */
 #if defined(CONFIG_8xx)
-#define flush_HPTE(X, va, pg)	_tlbie(va, 0 /* 8xx doesn't care about PID */)
 #define MMU_init_hw()		do { } while(0)
 #define mmu_mapin_ram()		(0UL)
 
 #elif defined(CONFIG_4xx)
-#define flush_HPTE(pid, va, pg)	_tlbie(va, pid)
 extern void MMU_init_hw(void);
 extern unsigned long mmu_mapin_ram(void);
 
 #elif defined(CONFIG_FSL_BOOKE)
-#define flush_HPTE(pid, va, pg)	_tlbie(va, pid)
 extern void MMU_init_hw(void);
 extern unsigned long mmu_mapin_ram(void);
 extern void adjust_total_lowmem(void);
@@ -77,18 +74,4 @@ extern void adjust_total_lowmem(void);
 /* anything 32-bit except 4xx or 8xx */
 extern void MMU_init_hw(void);
 extern unsigned long mmu_mapin_ram(void);
-
-/* Be careful....this needs to be updated if we ever encounter 603 SMPs,
- * which includes all new 82xx processors.  We need tlbie/tlbsync here
- * in that case (I think). -- Dan.
- */
-static inline void flush_HPTE(unsigned context, unsigned long va,
-			      unsigned long pdval)
-{
-	if ((Hash != 0) &&
-	    cpu_has_feature(CPU_FTR_HPTE_TABLE))
-		flush_hash_pages(0, va, pdval, 1);
-	else
-		_tlbie(va);
-}
 #endif
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index c7b755c..3414724 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -342,7 +342,11 @@ static int __change_page_attr(struct page *page, pgprot_t prot)
 		return -EINVAL;
 	set_pte_at(&init_mm, address, kpte, mk_pte(page, prot));
 	wmb();
-	flush_HPTE(0, address, pmd_val(*kpmd));
+#ifdef CONFIG_PPC_STD_MMU
+	flush_hash_pages(0, address, pmd_val(*kpmd), 1);
+#else
+	flush_tlb_page(NULL, address);
+#endif
 	pte_unmap(kpte);
 
 	return 0;