linux-kernel - [PATCH] powerpc/mm: define an empty slice_init_new_context

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Date:   Mon, 10 Dec 2018 12:23:05 +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>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/mm: define an empty slice_init_new_context_exec()

Define slice_init_new_context_exec() at all time to avoid

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/slice.h     | 14 +++++++++-----
 arch/powerpc/mm/mmu_context_nohash.c |  2 --
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/slice.h b/arch/powerpc/include/asm/slice.h
index a595461c9cb0..44816cbc4198 100644
--- a/arch/powerpc/include/asm/slice.h
+++ b/arch/powerpc/include/asm/slice.h
@@ -10,6 +10,10 @@
 #include <asm/nohash/32/slice.h>
 #endif
 
+#ifndef __ASSEMBLY__
+
+struct mm_struct;
+
 #ifdef CONFIG_PPC_MM_SLICES
 
 #ifdef CONFIG_HUGETLB_PAGE
@@ -18,10 +22,6 @@
 #define HAVE_ARCH_UNMAPPED_AREA
 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 
-#ifndef __ASSEMBLY__
-
-struct mm_struct;
-
 unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
 				      unsigned long flags, unsigned int psize,
 				      int topdown);
@@ -34,8 +34,12 @@ void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
 void slice_init_new_context_exec(struct mm_struct *mm);
 void slice_setup_new_exec(void);
 
-#endif /* __ASSEMBLY__ */
+#else /* CONFIG_PPC_MM_SLICES */
+
+static inline void slice_init_new_context_exec(struct mm_struct *mm) {}
 
 #endif /* CONFIG_PPC_MM_SLICES */
 
+#endif /* __ASSEMBLY__ */
+
 #endif /* _ASM_POWERPC_SLICE_H */
diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index 431ecf37f17c..22d71a58167f 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -372,7 +372,6 @@ int init_new_context(struct task_struct *t, struct mm_struct *mm)
 {
 	pr_hard("initing context for mm @%p\n", mm);
 
-#ifdef	CONFIG_PPC_MM_SLICES
 	/*
 	 * We have MMU_NO_CONTEXT set to be ~0. Hence check
 	 * explicitly against context.id == 0. This ensures that we properly
@@ -382,7 +381,6 @@ int init_new_context(struct task_struct *t, struct mm_struct *mm)
 	 */
 	if (mm->context.id == 0)
 		slice_init_new_context_exec(mm);
-#endif
 	mm->context.id = MMU_NO_CONTEXT;
 	mm->context.active = 0;
 	pte_frag_set(&mm->context, NULL);
-- 
2.13.3