Subject: [PATCH] powerpc: Define/use HUGETLB_NEED_PRELOAD insead of complicated #if

From: Becky Bruce <[email-masked]>
Date: Tue, 29 Nov 2011 19:10:39 -0600

From: Becky Bruce <[email-masked]>

Define HUGETLB_NEED_PRELOAD in mmu-book3e.h for CONFIG_PPC64 instead
of having a much more complicated #if block.  This is easier to read
and maintain.

Signed-off-by: Becky Bruce <[email-masked]>
---
 arch/powerpc/include/asm/hugetlb.h    |    3 +--
 arch/powerpc/include/asm/mmu-book3e.h |    7 +++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
index 863f49d..dfdb95b 100644
--- a/arch/powerpc/include/asm/hugetlb.h
+++ b/arch/powerpc/include/asm/hugetlb.h
@@ -124,8 +124,7 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 					     unsigned long addr, pte_t *ptep,
 					     pte_t pte, int dirty)
 {
-#if defined(CONFIG_PPC_MMU_NOHASH) && \
-	!(defined(CONFIG_PPC_FSL_BOOK3E) && defined(CONFIG_PPC32))
+#ifdef HUGETLB_NEED_PRELOAD
 	/*
 	 * The "return 1" forces a call of update_mmu_cache, which will write a
 	 * TLB entry.  Without this, platforms that don't do a write of the TLB
diff --git a/arch/powerpc/include/asm/mmu-book3e.h b/arch/powerpc/include/asm/mmu-book3e.h
index e4d0afc..20d29a5 100644
--- a/arch/powerpc/include/asm/mmu-book3e.h
+++ b/arch/powerpc/include/asm/mmu-book3e.h
@@ -262,6 +262,13 @@ extern int mmu_vmemmap_psize;
 
 #ifdef CONFIG_PPC64
 extern unsigned long linear_map_top;
+
+/*
+ * 64-bit booke platforms don't load the tlb in the tlb miss handler code.
+ * HUGETLB_NEED_PRELOAD handles this - it causes huge_ptep_set_access_flags to
+ * return 1, indicating that the tlb requires preloading.
+ */
+#define HUGETLB_NEED_PRELOAD
 #endif
 
 #endif /* !__ASSEMBLY__ */
-- 
1.5.6.5