mm: arch: consolidate mmap hugetlb size encodings

A non-default huge page size can be encoded in the flags argument of the
mmap system call.  The definitions for these encodings are in arch
specific header files.  However, all architectures use the same values.

Consolidate all the definitions in the primary user header file
(uapi/linux/mman.h).  Include definitions for all known huge page sizes.
Use the generic encoding definitions in hugetlb_encode.h as the basis
for these definitions.

Link: http://lkml.kernel.org/r/1501527386-10736-3-git-send-email-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/alpha/include/uapi/asm/mman.h b/arch/alpha/include/uapi/asm/mman.h
index 02760f6e6ca443547eb2bfbf248fe41fefc49be7..13b52aad3c43c42491c65cc71b021bc3a7a83762 100644 (file)
--- a/arch/alpha/include/uapi/asm/mman.h
+++ b/arch/alpha/include/uapi/asm/mman.h
@@ -67,17 +67,6 @@
 /* compatibility flags */
 #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.
- */
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK  0x3f
-
 #define PKEY_DISABLE_ACCESS    0x1
 #define PKEY_DISABLE_WRITE     0x2
 #define PKEY_ACCESS_MASK       (PKEY_DISABLE_ACCESS |\

diff --git a/arch/mips/include/uapi/asm/mman.h b/arch/mips/include/uapi/asm/mman.h
index 655e2fb5395b5ba4dbfba2df396c9c0c8752eb2e..398eebcc3541473bad680ee587dbca450dfcc3ba 100644 (file)
--- a/arch/mips/include/uapi/asm/mman.h
+++ b/arch/mips/include/uapi/asm/mman.h
@@ -94,17 +94,6 @@
 /* compatibility flags */
 #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.
- */
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK  0x3f
-
 #define PKEY_DISABLE_ACCESS    0x1
 #define PKEY_DISABLE_WRITE     0x2
 #define PKEY_ACCESS_MASK       (PKEY_DISABLE_ACCESS |\

diff --git a/arch/parisc/include/uapi/asm/mman.h b/arch/parisc/include/uapi/asm/mman.h
index 9a9c2fe4be500def3f3aaa0a1334e09f3e8716a5..b87fbe3f338adf3950bc6c67feeda77ee7bacbe5 100644 (file)
--- a/arch/parisc/include/uapi/asm/mman.h
+++ b/arch/parisc/include/uapi/asm/mman.h
@@ -64,17 +64,6 @@
 #define MAP_FILE       0
 #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.
- */
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK  0x3f
-
 #define PKEY_DISABLE_ACCESS    0x1
 #define PKEY_DISABLE_WRITE     0x2
 #define PKEY_ACCESS_MASK       (PKEY_DISABLE_ACCESS |\

diff --git a/arch/powerpc/include/uapi/asm/mman.h b/arch/powerpc/include/uapi/asm/mman.h
index ab45cc2f31018a66aebec62c93f27e6274467f70..03c06ba7464f4fc47d7f5b6f0fb0057fa69d8f1c 100644 (file)
--- a/arch/powerpc/include/uapi/asm/mman.h
+++ b/arch/powerpc/include/uapi/asm/mman.h
@@ -29,20 +29,4 @@
 #define MAP_STACK      0x20000         /* give out an address that is best suited for process/thread stacks */
 #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.
- */
-#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 */
-
 #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 39bca7fac087098c1f972de4b1468733ffe6220a..3be08f07695c0ebe567dbad418152c5767277912 100644 (file)
--- a/arch/x86/include/uapi/asm/mman.h
+++ b/arch/x86/include/uapi/asm/mman.h
@@ -3,9 +3,6 @@
 
 #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)
-
 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
 /*
  * Take the 4 protection key bits out of the vma->vm_flags

diff --git a/arch/xtensa/include/uapi/asm/mman.h b/arch/xtensa/include/uapi/asm/mman.h
index 24365b30aae95adc240c5e38bd07edb7da03ba13..8ce77a2e9babffb5d171b78b5aacb2712b5dc458 100644 (file)
--- a/arch/xtensa/include/uapi/asm/mman.h
+++ b/arch/xtensa/include/uapi/asm/mman.h
@@ -106,17 +106,6 @@
 /* compatibility flags */
 #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.
- */
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK  0x3f
-
 #define PKEY_DISABLE_ACCESS    0x1
 #define PKEY_DISABLE_WRITE     0x2
 #define PKEY_ACCESS_MASK       (PKEY_DISABLE_ACCESS |\

diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index 8c27db0c5c08ce84fc7299bd9bff2cee571b9397..d248f3c335b58850f20020cf6c2c54eae50e4f2e 100644 (file)
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -61,17 +61,6 @@
 /* compatibility flags */
 #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.
- */
-#define MAP_HUGE_SHIFT 26
-#define MAP_HUGE_MASK  0x3f
-
 #define PKEY_DISABLE_ACCESS    0x1
 #define PKEY_DISABLE_WRITE     0x2
 #define PKEY_ACCESS_MASK       (PKEY_DISABLE_ACCESS |\

diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h
index ade4acd3a90cd498d4409abe263681d590a7de96..a937480d7cd345f4e1b12c2e409f58c0489e8a4e 100644 (file)
--- a/include/uapi/linux/mman.h
+++ b/include/uapi/linux/mman.h
@@ -2,6 +2,7 @@
 #define _UAPI_LINUX_MMAN_H
 
 #include <asm/mman.h>
+#include <asm-generic/hugetlb_encode.h>
 
 #define MREMAP_MAYMOVE 1
 #define MREMAP_FIXED   2
@@ -10,4 +11,25 @@
 #define OVERCOMMIT_ALWAYS              1
 #define OVERCOMMIT_NEVER               2
 
+/*
+ * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
+ * size other than the default is desired.  See hugetlb_encode.h.
+ * All known huge page size encodings are provided here.  It is the
+ * responsibility of the application to know which sizes are supported on
+ * the running system.  See mmap(2) man page for details.
+ */
+#define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MAP_HUGE_MASK  HUGETLB_FLAG_ENCODE_MASK
+
+#define MAP_HUGE_64KB  HUGETLB_FLAG_ENCODE_64KB
+#define MAP_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB
+#define MAP_HUGE_1MB   HUGETLB_FLAG_ENCODE_1MB
+#define MAP_HUGE_2MB   HUGETLB_FLAG_ENCODE_2MB
+#define MAP_HUGE_8MB   HUGETLB_FLAG_ENCODE_8MB
+#define MAP_HUGE_16MB  HUGETLB_FLAG_ENCODE_16MB
+#define MAP_HUGE_256MB HUGETLB_FLAG_ENCODE_256MB
+#define MAP_HUGE_1GB   HUGETLB_FLAG_ENCODE_1GB
+#define MAP_HUGE_2GB   HUGETLB_FLAG_ENCODE_2GB
+#define MAP_HUGE_16GB  HUGETLB_FLAG_ENCODE_16GB
+
 #endif /* _UAPI_LINUX_MMAN_H */