linux-kernel - [PATCH 1/8] mm, powerpc, x86: define VM_PKEY_BITx bits if CONFIG_ARCH_HAS

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Message-Id: <20180508145948.9492-2-mpe@ellerman.id.au>
Date:   Wed,  9 May 2018 00:59:41 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     linuxram@...ibm.com
Cc:     mingo@...hat.com, linuxppc-dev@...abs.org, linux-mm@...ck.org,
        x86@...nel.org, linux-kernel@...r.kernel.org, dave.hansen@...el.com
Subject: [PATCH 1/8] mm, powerpc, x86: define VM_PKEY_BITx bits if CONFIG_ARCH_HAS_PKEYS is enabled

From: Ram Pai <linuxram@...ibm.com>

VM_PKEY_BITx are defined only if CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
is enabled. Powerpc also needs these bits. Hence lets define the
VM_PKEY_BITx bits for any architecture that enables
CONFIG_ARCH_HAS_PKEYS.

Reviewed-by: Dave Hansen <dave.hansen@...el.com>
Signed-off-by: Ram Pai <linuxram@...ibm.com>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 arch/powerpc/include/asm/pkeys.h | 2 ++
 fs/proc/task_mmu.c               | 4 ++--
 include/linux/mm.h               | 9 +++++----
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index 0409c80c32c0..18ef59a9886d 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -26,6 +26,8 @@ extern u32 initial_allocation_mask; /* bits set for reserved keys */
 # define VM_PKEY_BIT2	VM_HIGH_ARCH_2
 # define VM_PKEY_BIT3	VM_HIGH_ARCH_3
 # define VM_PKEY_BIT4	VM_HIGH_ARCH_4
+#elif !defined(VM_PKEY_BIT4)
+# define VM_PKEY_BIT4	VM_HIGH_ARCH_4
 #endif
 
 #define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c486ad4b43f0..541392a62608 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -673,13 +673,13 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
 		[ilog2(VM_MERGEABLE)]	= "mg",
 		[ilog2(VM_UFFD_MISSING)]= "um",
 		[ilog2(VM_UFFD_WP)]	= "uw",
-#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+#ifdef CONFIG_ARCH_HAS_PKEYS
 		/* These come out via ProtectionKey: */
 		[ilog2(VM_PKEY_BIT0)]	= "",
 		[ilog2(VM_PKEY_BIT1)]	= "",
 		[ilog2(VM_PKEY_BIT2)]	= "",
 		[ilog2(VM_PKEY_BIT3)]	= "",
-#endif
+#endif /* CONFIG_ARCH_HAS_PKEYS */
 	};
 	size_t i;
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1ac1f06a4be6..c6a6f2492c1b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -228,15 +228,16 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_HIGH_ARCH_4	BIT(VM_HIGH_ARCH_BIT_4)
 #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
 
-#if defined(CONFIG_X86)
-# define VM_PAT		VM_ARCH_1	/* PAT reserves whole VMA at once (x86) */
-#if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS)
+#ifdef CONFIG_ARCH_HAS_PKEYS
 # define VM_PKEY_SHIFT	VM_HIGH_ARCH_BIT_0
 # define VM_PKEY_BIT0	VM_HIGH_ARCH_0	/* A protection key is a 4-bit value */
 # define VM_PKEY_BIT1	VM_HIGH_ARCH_1
 # define VM_PKEY_BIT2	VM_HIGH_ARCH_2
 # define VM_PKEY_BIT3	VM_HIGH_ARCH_3
-#endif
+#endif /* CONFIG_ARCH_HAS_PKEYS */
+
+#if defined(CONFIG_X86)
+# define VM_PAT		VM_ARCH_1	/* PAT reserves whole VMA at once (x86) */
 #elif defined(CONFIG_PPC)
 # define VM_SAO		VM_ARCH_1	/* Strong Access Ordering (powerpc) */
 #elif defined(CONFIG_PARISC)
-- 
2.14.1