linux-kernel - [PATCH v2 04/11] powerpc/mm: move slice_mask_for

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Date:   Thu, 25 Apr 2019 14:29:30 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        aneesh.kumar@...ux.ibm.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 04/11] powerpc/mm: move slice_mask_for_size() into mmu.h

Move slice_mask_for_size() into subarch mmu.h

At the same time, replace BUG() by VM_BUG_ON() as those BUG() are not
there to catch runtime errors but to catch errors during development
cycle only.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/book3s/64/mmu.h     | 17 +++++++++++
 arch/powerpc/include/asm/nohash/32/mmu-8xx.h | 42 +++++++++++++++++++---------
 arch/powerpc/mm/slice.c                      | 34 ----------------------
 3 files changed, 46 insertions(+), 47 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h
index 230a9dec7677..ad00355f874f 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu.h
@@ -203,6 +203,23 @@ static inline struct slice_mask *mm_ctx_slice_mask_16g(mm_context_t *ctx)
 }
 #endif
 
+static inline struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize)
+{
+#ifdef CONFIG_PPC_64K_PAGES
+	if (psize == MMU_PAGE_64K)
+		return mm_ctx_slice_mask_64k(&ctx);
+#endif
+#ifdef CONFIG_HUGETLB_PAGE
+	if (psize == MMU_PAGE_16M)
+		return mm_ctx_slice_mask_16m(&ctx);
+	if (psize == MMU_PAGE_16G)
+		return mm_ctx_slice_mask_16g(&ctx);
+#endif
+	VM_BUG_ON(psize != MMU_PAGE_4K);
+
+	return mm_ctx_slice_mask_4k(&ctx);
+}
+
 #ifdef CONFIG_PPC_SUBPAGE_PROT
 static inline struct subpage_prot_table *mm_ctx_subpage_prot(mm_context_t *ctx)
 {
diff --git a/arch/powerpc/include/asm/nohash/32/mmu-8xx.h b/arch/powerpc/include/asm/nohash/32/mmu-8xx.h
index c503e2f05e61..a0f6844a1498 100644
--- a/arch/powerpc/include/asm/nohash/32/mmu-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/mmu-8xx.h
@@ -184,7 +184,23 @@
 #define LOW_SLICE_ARRAY_SZ	SLICE_ARRAY_SIZE
 #endif
 
+#if defined(CONFIG_PPC_4K_PAGES)
+#define mmu_virtual_psize	MMU_PAGE_4K
+#elif defined(CONFIG_PPC_16K_PAGES)
+#define mmu_virtual_psize	MMU_PAGE_16K
+#define PTE_FRAG_NR		4
+#define PTE_FRAG_SIZE_SHIFT	12
+#define PTE_FRAG_SIZE		(1UL << 12)
+#else
+#error "Unsupported PAGE_SIZE"
+#endif
+
+#define mmu_linear_psize	MMU_PAGE_8M
+
 #ifndef __ASSEMBLY__
+
+#include <linux/mmdebug.h>
+
 struct slice_mask {
 	u64 low_slices;
 	DECLARE_BITMAP(high_slices, 0);
@@ -255,6 +271,19 @@ static inline struct slice_mask *mm_ctx_slice_mask_8m(mm_context_t *ctx)
 	return &ctx->mask_8m;
 }
 #endif
+
+static inline struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize)
+{
+#ifdef CONFIG_HUGETLB_PAGE
+	if (psize == MMU_PAGE_512K)
+		return &ctx->mask_512k;
+	if (psize == MMU_PAGE_8M)
+		return &ctx->mask_8m;
+#endif
+	VM_BUG_ON(psize != mmu_virtual_psize);
+
+	return &ctx->mask_base_psize;
+}
 #endif /* CONFIG_PPC_MM_SLICE */
 
 #define PHYS_IMMR_BASE (mfspr(SPRN_IMMR) & 0xfff80000)
@@ -306,17 +335,4 @@ extern s32 patch__itlbmiss_perf, patch__dtlbmiss_perf;
 
 #endif /* !__ASSEMBLY__ */
 
-#if defined(CONFIG_PPC_4K_PAGES)
-#define mmu_virtual_psize	MMU_PAGE_4K
-#elif defined(CONFIG_PPC_16K_PAGES)
-#define mmu_virtual_psize	MMU_PAGE_16K
-#define PTE_FRAG_NR		4
-#define PTE_FRAG_SIZE_SHIFT	12
-#define PTE_FRAG_SIZE		(1UL << 12)
-#else
-#error "Unsupported PAGE_SIZE"
-#endif
-
-#define mmu_linear_psize	MMU_PAGE_8M
-
 #endif /* _ASM_POWERPC_MMU_8XX_H_ */
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 8eb7e8b09c75..31de91b65a64 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -150,40 +150,6 @@ static void slice_mask_for_free(struct mm_struct *mm, struct slice_mask *ret,
 			__set_bit(i, ret->high_slices);
 }
 
-#ifdef CONFIG_PPC_BOOK3S_64
-static struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize)
-{
-#ifdef CONFIG_PPC_64K_PAGES
-	if (psize == MMU_PAGE_64K)
-		return mm_ctx_slice_mask_64k(&ctx);
-#endif
-	if (psize == MMU_PAGE_4K)
-		return mm_ctx_slice_mask_4k(&ctx);
-#ifdef CONFIG_HUGETLB_PAGE
-	if (psize == MMU_PAGE_16M)
-		return mm_ctx_slice_mask_16m(&ctx);
-	if (psize == MMU_PAGE_16G)
-		return mm_ctx_slice_mask_16g(&ctx);
-#endif
-	BUG();
-}
-#elif defined(CONFIG_PPC_8xx)
-static struct slice_mask *slice_mask_for_size(mm_context_t *ctx, int psize)
-{
-	if (psize == mmu_virtual_psize)
-		return &ctx->mask_base_psize;
-#ifdef CONFIG_HUGETLB_PAGE
-	if (psize == MMU_PAGE_512K)
-		return &ctx->mask_512k;
-	if (psize == MMU_PAGE_8M)
-		return &ctx->mask_8m;
-#endif
-	BUG();
-}
-#else
-#error "Must define the slice masks for page sizes supported by the platform"
-#endif
-
 static bool slice_check_range_fits(struct mm_struct *mm,
 			   const struct slice_mask *available,
 			   unsigned long start, unsigned long len)
-- 
2.13.3