Revert "powerpc/mm: Fix bug in pagetable cache cleanup with CONFIG_PPC_SUBPAGE_PROT"

This reverts commit c045256d146800ea1d741a8e9e377dada6b7e195.

It breaks build when CONFIG_PPC_SUBPAGE_PROT is not set. I will
commit a fixed version separately

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 0 insertions, 35 deletions

diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index 9d9551840f4a..7514ec2f8540 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -373,38 +373,6 @@ extern void slb_set_size(u16 size);
 
 #ifndef __ASSEMBLY__
 
-#ifdef CONFIG_PPC_SUBPAGE_PROT
-/*
- * For the sub-page protection option, we extend the PGD with one of
- * these.  Basically we have a 3-level tree, with the top level being
- * the protptrs array.  To optimize speed and memory consumption when
- * only addresses < 4GB are being protected, pointers to the first
- * four pages of sub-page protection words are stored in the low_prot
- * array.
- * Each page of sub-page protection words protects 1GB (4 bytes
- * protects 64k).  For the 3-level tree, each page of pointers then
- * protects 8TB.
- */
-struct subpage_prot_table {
-        unsigned long maxaddr;  /* only addresses < this are protected */
-        unsigned int **protptrs[2];
-        unsigned int *low_prot[4];
-};
-
-#define SBP_L1_BITS             (PAGE_SHIFT - 2)
-#define SBP_L2_BITS             (PAGE_SHIFT - 3)
-#define SBP_L1_COUNT            (1 << SBP_L1_BITS)
-#define SBP_L2_COUNT            (1 << SBP_L2_BITS)
-#define SBP_L2_SHIFT            (PAGE_SHIFT + SBP_L1_BITS)
-#define SBP_L3_SHIFT            (SBP_L2_SHIFT + SBP_L2_BITS)
-
-extern void subpage_prot_free(struct mm_struct *mm);
-extern void subpage_prot_init_new_context(struct mm_struct *mm);
-#else
-static inline void subpage_prot_free(pgd_t *pgd) {}
-static inline void subpage_prot_init_new_context(struct mm_struct *mm) { }
-#endif /* CONFIG_PPC_SUBPAGE_PROT */
-
 typedef unsigned long mm_context_id_t;
 
 typedef struct {
@@ -418,9 +386,6 @@ typedef struct {
         u16 sllp;               /* SLB page size encoding */
 #endif
         unsigned long vdso_base;
-#ifdef CONFIG_PPC_SUBPAGE_PROT
-        struct subpage_prot_table spt;
-#endif /* CONFIG_PPC_SUBPAGE_PROT */
 } mm_context_t;