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Date: Mon, 17 Jul 2017 15:28:00 -0700
From: Mike Kravetz <mike.kravetz@...cle.com>
To: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc: Matthew Wilcox <willy@...radead.org>, akpm@...ux-foundation.org,
mhocko@...e.com, ak@...ux.intel.com, mtk.manpages@...il.com,
Davidlohr Bueso <dbueso@...e.de>, khandual@...ux.vnet.ibm.com,
aneesh.kumar@...ux.vnet.ibm.com, aarcange@...hat.com,
Mike Kravetz <mike.kravetz@...cle.com>
Subject: [RFC PATCH 2/3] mm: arch: Use new hugetlb size encoding definitions
Use the common definitions from hugetlb_encode.h header file for
encoding hugetlb size definitions in mmap system call flags.
Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
---
arch/alpha/include/uapi/asm/mman.h | 14 ++++++--------
arch/mips/include/uapi/asm/mman.h | 14 ++++++--------
arch/parisc/include/uapi/asm/mman.h | 14 ++++++--------
arch/powerpc/include/uapi/asm/mman.h | 23 ++++++++++-------------
arch/x86/include/uapi/asm/mman.h | 10 ++++++++--
arch/xtensa/include/uapi/asm/mman.h | 14 ++++++--------
include/uapi/asm-generic/mman-common.h | 6 ++++--
7 files changed, 46 insertions(+), 49 deletions(-)
diff --git a/arch/alpha/include/uapi/asm/mman.h b/arch/alpha/include/uapi/asm/mman.h
index 02760f6..bfa5828 100644
--- a/arch/alpha/include/uapi/asm/mman.h
+++ b/arch/alpha/include/uapi/asm/mman.h
@@ -1,6 +1,8 @@
#ifndef __ALPHA_MMAN_H__
#define __ALPHA_MMAN_H__
+#include <asm-generic/hugetlb_encode.h>
+
#define PROT_READ 0x1 /* page can be read */
#define PROT_WRITE 0x2 /* page can be written */
#define PROT_EXEC 0x4 /* page can be executed */
@@ -68,15 +70,11 @@
#define MAP_FILE 0
/*
- * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
- * This gives us 6 bits, which is enough until someone invents 128 bit address
- * spaces.
- *
- * Assume these are all power of twos.
- * When 0 use the default page size.
+ * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
+ * size other than the default is desired. See hugetlb_encode.h
*/
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK 0x3f
+#define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MAP_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
diff --git a/arch/mips/include/uapi/asm/mman.h b/arch/mips/include/uapi/asm/mman.h
index 655e2fb..9e55284 100644
--- a/arch/mips/include/uapi/asm/mman.h
+++ b/arch/mips/include/uapi/asm/mman.h
@@ -8,6 +8,8 @@
#ifndef _ASM_MMAN_H
#define _ASM_MMAN_H
+#include <asm-generic/hugetlb_encode.h>
+
/*
* Protections are chosen from these bits, OR'd together. The
* implementation does not necessarily support PROT_EXEC or PROT_WRITE
@@ -95,15 +97,11 @@
#define MAP_FILE 0
/*
- * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
- * This gives us 6 bits, which is enough until someone invents 128 bit address
- * spaces.
- *
- * Assume these are all power of twos.
- * When 0 use the default page size.
+ * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
+ * size other than the default is desired. See hugetlb_encode.h
*/
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK 0x3f
+#define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MAP_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
diff --git a/arch/parisc/include/uapi/asm/mman.h b/arch/parisc/include/uapi/asm/mman.h
index 5979745..11c6d86 100644
--- a/arch/parisc/include/uapi/asm/mman.h
+++ b/arch/parisc/include/uapi/asm/mman.h
@@ -1,6 +1,8 @@
#ifndef __PARISC_MMAN_H__
#define __PARISC_MMAN_H__
+#include <asm-generic/hugetlb_encode.h>
+
#define PROT_READ 0x1 /* page can be read */
#define PROT_WRITE 0x2 /* page can be written */
#define PROT_EXEC 0x4 /* page can be executed */
@@ -65,15 +67,11 @@
#define MAP_VARIABLE 0
/*
- * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
- * This gives us 6 bits, which is enough until someone invents 128 bit address
- * spaces.
- *
- * Assume these are all power of twos.
- * When 0 use the default page size.
+ * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
+ * size other than the default is desired. See hugetlb_encode.h
*/
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK 0x3f
+#define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MAP_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
diff --git a/arch/powerpc/include/uapi/asm/mman.h b/arch/powerpc/include/uapi/asm/mman.h
index ab45cc2..80fd56c 100644
--- a/arch/powerpc/include/uapi/asm/mman.h
+++ b/arch/powerpc/include/uapi/asm/mman.h
@@ -8,6 +8,7 @@
#define _UAPI_ASM_POWERPC_MMAN_H
#include <asm-generic/mman-common.h>
+#include <asm-generic/hugetlb_encode.h>
#define PROT_SAO 0x10 /* Strong Access Ordering */
@@ -30,19 +31,15 @@
#define MAP_HUGETLB 0x40000 /* create a huge page mapping */
/*
- * When MAP_HUGETLB is set, bits [26:31] of the flags argument to mmap(2),
- * encode the log2 of the huge page size. A value of zero indicates that the
- * default huge page size should be used. To use a non-default huge page size,
- * one of these defines can be used, or the size can be encoded by hand. Note
- * that on most systems only a subset, or possibly none, of these sizes will be
- * available.
+ * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
+ * size other than the default is desired. See hugetlb_encode.h
*/
-#define MAP_HUGE_512KB (19 << MAP_HUGE_SHIFT) /* 512KB HugeTLB Page */
-#define MAP_HUGE_1MB (20 << MAP_HUGE_SHIFT) /* 1MB HugeTLB Page */
-#define MAP_HUGE_2MB (21 << MAP_HUGE_SHIFT) /* 2MB HugeTLB Page */
-#define MAP_HUGE_8MB (23 << MAP_HUGE_SHIFT) /* 8MB HugeTLB Page */
-#define MAP_HUGE_16MB (24 << MAP_HUGE_SHIFT) /* 16MB HugeTLB Page */
-#define MAP_HUGE_1GB (30 << MAP_HUGE_SHIFT) /* 1GB HugeTLB Page */
-#define MAP_HUGE_16GB (34 << MAP_HUGE_SHIFT) /* 16GB HugeTLB Page */
+#define MAP_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB /* 512KB HugeTLB Page */
+#define MAP_HUGE_1MB HUGETLB_FLAG_ENCODE_1MB /* 1MB HugeTLB Page */
+#define MAP_HUGE_2MB HUGETLB_FLAG_ENCODE_2MB /* 2MB HugeTLB Page */
+#define MAP_HUGE_8MB HUGETLB_FLAG_ENCODE_8MB /* 8MB HugeTLB Page */
+#define MAP_HUGE_16MB HUGETLB_FLAG_ENCODE_16MB /* 16MB HugeTLB Page */
+#define MAP_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB /* 1GB HugeTLB Page */
+#define MAP_HUGE_16GB HUGETLB_FLAG_ENCODE__16GB /* 16GB HugeTLB Page */
#endif /* _UAPI_ASM_POWERPC_MMAN_H */
diff --git a/arch/x86/include/uapi/asm/mman.h b/arch/x86/include/uapi/asm/mman.h
index 39bca7f..5a67293 100644
--- a/arch/x86/include/uapi/asm/mman.h
+++ b/arch/x86/include/uapi/asm/mman.h
@@ -1,10 +1,16 @@
#ifndef _ASM_X86_MMAN_H
#define _ASM_X86_MMAN_H
+#include <asm-generic/hugetlb_encode.h>
+
#define MAP_32BIT 0x40 /* only give out 32bit addresses */
-#define MAP_HUGE_2MB (21 << MAP_HUGE_SHIFT)
-#define MAP_HUGE_1GB (30 << MAP_HUGE_SHIFT)
+/*
+ * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
+ * size other than the default is desired. See hugetlb_encode.h
+ */
+#define MAP_HUGE_2MB HUGETLB_FLAG_ENCODE_2MB
+#define MAP_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
/*
diff --git a/arch/xtensa/include/uapi/asm/mman.h b/arch/xtensa/include/uapi/asm/mman.h
index 24365b3..5deb5e4 100644
--- a/arch/xtensa/include/uapi/asm/mman.h
+++ b/arch/xtensa/include/uapi/asm/mman.h
@@ -14,6 +14,8 @@
#ifndef _XTENSA_MMAN_H
#define _XTENSA_MMAN_H
+#include <asm-generic/hugetlb_encode.h>
+
/*
* Protections are chosen from these bits, OR'd together. The
* implementation does not necessarily support PROT_EXEC or PROT_WRITE
@@ -107,15 +109,11 @@
#define MAP_FILE 0
/*
- * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
- * This gives us 6 bits, which is enough until someone invents 128 bit address
- * spaces.
- *
- * Assume these are all power of twos.
- * When 0 use the default page size.
+ * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
+ * size other than the default is desired. See hugetlb_encode.h
*/
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK 0x3f
+#define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MAP_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index 8c27db0..00d56b8 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -1,6 +1,8 @@
#ifndef __ASM_GENERIC_MMAN_COMMON_H
#define __ASM_GENERIC_MMAN_COMMON_H
+#include <asm-generic/hugetlb_encode.h>
+
/*
Author: Michael S. Tsirkin <mst@...lanox.co.il>, Mellanox Technologies Ltd.
Based on: asm-xxx/mman.h
@@ -69,8 +71,8 @@
* Assume these are all power of twos.
* When 0 use the default page size.
*/
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK 0x3f
+#define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MAP_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
--
2.7.5
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