linux-kernel - [PATCH] parisc: Fix up generic MADV_* values and add MADV_HWPOISON and MADV_SOFT

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Date:   Fri, 4 Aug 2017 18:31:48 +0200
From:   Helge Deller <deller@....de>
To:     linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        John David Anglin <dave.anglin@...l.net>
Subject: [PATCH] parisc: Fix up generic MADV_* values and add MADV_HWPOISON
 and MADV_SOFT_OFFLINE

This patch adds the missing MADV_HWPOISON (100) and MADV_SOFT_OFFLINE (101)
defines which are needed for an upcoming patch which adds page-deallocation to
parisc.

In addition there is a conflict with some the common/generic MADV_* constants
between kernel headers and glibc headers.  The existing glibc headers on parisc
already define those values in the range of 8-17 which should be common between
all architectures and which all architectures with the exception of parisc
follow.  But the parisc kernel still defines those with values above 65 because
of an old kernel patch which reserved the range of 12-64 for page size
specifications.  The old kernel patch never actually used those values in code,
so changing those MADV_* constants back to the common values shouldn't break
anything and instead make existing userspace applications work as expected.

Signed-off-by: Helge Deller <deller@....de>

diff --git a/arch/parisc/include/uapi/asm/mman.h b/arch/parisc/include/uapi/asm/mman.h
index 5979745..a34ebf4 100644
--- a/arch/parisc/include/uapi/asm/mman.h
+++ b/arch/parisc/include/uapi/asm/mman.h
@@ -49,16 +49,18 @@
 #define MADV_REMOVE	9		/* remove these pages & resources */
 #define MADV_DONTFORK	10		/* don't inherit across fork */
 #define MADV_DOFORK	11		/* do inherit across fork */
+#define MADV_HWPOISON	100		/* poison a page for testing */
+#define MADV_SOFT_OFFLINE 101		/* soft offline page for testing */
 
-#define MADV_MERGEABLE   65		/* KSM may merge identical pages */
-#define MADV_UNMERGEABLE 66		/* KSM may not merge identical pages */
+#define MADV_MERGEABLE   12		/* KSM may merge identical pages */
+#define MADV_UNMERGEABLE 13		/* KSM may not merge identical pages */
 
-#define MADV_HUGEPAGE	67		/* Worth backing with hugepages */
-#define MADV_NOHUGEPAGE	68		/* Not worth backing with hugepages */
+#define MADV_HUGEPAGE	14		/* Worth backing with hugepages */
+#define MADV_NOHUGEPAGE	15		/* Not worth backing with hugepages */
 
-#define MADV_DONTDUMP   69		/* Explicity exclude from the core dump,
+#define MADV_DONTDUMP   16		/* Explicity exclude from the core dump,
 					   overrides the coredump filter bits */
-#define MADV_DODUMP	70		/* Clear the MADV_NODUMP flag */
+#define MADV_DODUMP	17		/* Clear the MADV_NODUMP flag */
 
 /* compatibility flags */
 #define MAP_FILE	0
diff --git a/tools/arch/parisc/include/uapi/asm/mman.h b/tools/arch/parisc/include/uapi/asm/mman.h
index 03d8d5b..eb4df3e 100644
--- a/tools/arch/parisc/include/uapi/asm/mman.h
+++ b/tools/arch/parisc/include/uapi/asm/mman.h
@@ -1,20 +1,22 @@
 #ifndef TOOLS_ARCH_PARISC_UAPI_ASM_MMAN_FIX_H
 #define TOOLS_ARCH_PARISC_UAPI_ASM_MMAN_FIX_H
-#define MADV_DODUMP	70
-#define MADV_DOFORK	11
-#define MADV_DONTDUMP   69
-#define MADV_DONTFORK	10
-#define MADV_DONTNEED   4
-#define MADV_FREE	8
-#define MADV_HUGEPAGE	67
-#define MADV_MERGEABLE   65
-#define MADV_NOHUGEPAGE	68
 #define MADV_NORMAL     0
 #define MADV_RANDOM     1
-#define MADV_REMOVE	9
 #define MADV_SEQUENTIAL 2
-#define MADV_UNMERGEABLE 66
 #define MADV_WILLNEED   3
+#define MADV_DONTNEED   4
+#define MADV_FREE	8
+#define MADV_REMOVE	9
+#define MADV_DONTFORK	10
+#define MADV_DOFORK	11
+#define MADV_HWPOISON	100
+#define MADV_SOFT_OFFLINE 101
+#define MADV_MERGEABLE	12
+#define MADV_UNMERGEABLE 13
+#define MADV_HUGEPAGE	14
+#define MADV_NOHUGEPAGE 15
+#define MADV_DONTDUMP	16
+#define MADV_DODUMP	17
 #define MAP_ANONYMOUS	0x10
 #define MAP_DENYWRITE	0x0800
 #define MAP_EXECUTABLE	0x1000
@@ -36,10 +38,6 @@
 #define PROT_READ	0x1
 #define PROT_SEM	0x8
 #define PROT_WRITE	0x2
-/* MADV_HWPOISON is undefined on parisc, fix it for perf */
-#define MADV_HWPOISON	100
-/* MADV_SOFT_OFFLINE is undefined on parisc, fix it for perf */
-#define MADV_SOFT_OFFLINE 101
 /* MAP_32BIT is undefined on parisc, fix it for perf */
 #define MAP_32BIT	0
 /* MAP_UNINITIALIZED is undefined on parisc, fix it for perf */