linux-kernel - [PATCH] arch: uapi: asm: mman.h: Support MADV

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Date:	Tue, 02 Dec 2014 04:43:19 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	minchan@...nel.org, "rth@...ddle.net" <rth@...ddle.net>,
	"ink@...assic.park.msu.ru" <ink@...assic.park.msu.ru>,
	"mattst88@...il.com" <mattst88@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"jejb@...isc-linux.org" <jejb@...isc-linux.org>,
	"deller@....de" <deller@....de>,
	"chris@...kel.net" <chris@...kel.net>,
	"jcmvbkbc@...il.com" <jcmvbkbc@...il.com>
CC:	"linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] arch: uapi: asm: mman.h: Support MADV_FREE for madvise()

At present, kernel supports madvise(MADV_FREE), so can benefit to all
related architectures (can grep MADV_WILLNEED or MADV_REMOVE in "arch/"
to know about all related architectures).

The related git commit: "4fb10ba mm: support madvise(MADV_FREE)".

The related error (with allmodconfig under parisc):

    CC      mm/madvise.o
  mm/madvise.c: In function 'madvise_need_mmap_write':
  mm/madvise.c:42:7: error: 'MADV_FREE' undeclared (first use in this function)
    case MADV_FREE:
       ^
  mm/madvise.c:42:7: note: each undeclared identifier is reported only once for each function it appears in
  mm/madvise.c: In function 'madvise_vma':
  mm/madvise.c:534:7: error: 'MADV_FREE' undeclared (first use in this function)
    case MADV_FREE:
       ^
  mm/madvise.c: In function 'madvise_behavior_valid':
  mm/madvise.c:561:7: error: 'MADV_FREE' undeclared (first use in this function)
    case MADV_FREE:
       ^
  make[1]: *** [mm/madvise.o] Error 1
  make: *** [mm] Error 2

Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 arch/alpha/include/uapi/asm/mman.h  | 1 +
 arch/mips/include/uapi/asm/mman.h   | 1 +
 arch/parisc/include/uapi/asm/mman.h | 1 +
 arch/xtensa/include/uapi/asm/mman.h | 1 +
 4 files changed, 4 insertions(+)

diff --git a/arch/alpha/include/uapi/asm/mman.h b/arch/alpha/include/uapi/asm/mman.h
index 0086b47..836fbd4 100644
--- a/arch/alpha/include/uapi/asm/mman.h
+++ b/arch/alpha/include/uapi/asm/mman.h
@@ -44,6 +44,7 @@
 #define MADV_WILLNEED	3		/* will need these pages */
 #define	MADV_SPACEAVAIL	5		/* ensure resources are available */
 #define MADV_DONTNEED	6		/* don't need these pages */
+#define MADV_FREE	7		/* free pages only if memory pressure */
 
 /* common/generic parameters */
 #define MADV_REMOVE	9		/* remove these pages & resources */
diff --git a/arch/mips/include/uapi/asm/mman.h b/arch/mips/include/uapi/asm/mman.h
index cfcb876..106e741 100644
--- a/arch/mips/include/uapi/asm/mman.h
+++ b/arch/mips/include/uapi/asm/mman.h
@@ -67,6 +67,7 @@
 #define MADV_SEQUENTIAL 2		/* expect sequential page references */
 #define MADV_WILLNEED	3		/* will need these pages */
 #define MADV_DONTNEED	4		/* don't need these pages */
+#define MADV_FREE	5		/* free pages only if memory pressure */
 
 /* common parameters: try to keep these consistent across architectures */
 #define MADV_REMOVE	9		/* remove these pages & resources */
diff --git a/arch/parisc/include/uapi/asm/mman.h b/arch/parisc/include/uapi/asm/mman.h
index 294d251..6cb8db7 100644
--- a/arch/parisc/include/uapi/asm/mman.h
+++ b/arch/parisc/include/uapi/asm/mman.h
@@ -40,6 +40,7 @@
 #define MADV_SPACEAVAIL 5               /* insure that resources are reserved */
 #define MADV_VPS_PURGE  6               /* Purge pages from VM page cache */
 #define MADV_VPS_INHERIT 7              /* Inherit parents page size */
+#define MADV_FREE	8		/* free pages only if memory pressure */
 
 /* common/generic parameters */
 #define MADV_REMOVE	9		/* remove these pages & resources */
diff --git a/arch/xtensa/include/uapi/asm/mman.h b/arch/xtensa/include/uapi/asm/mman.h
index 201aec0..1b19f25 100644
--- a/arch/xtensa/include/uapi/asm/mman.h
+++ b/arch/xtensa/include/uapi/asm/mman.h
@@ -80,6 +80,7 @@
 #define MADV_SEQUENTIAL	2		/* expect sequential page references */
 #define MADV_WILLNEED	3		/* will need these pages */
 #define MADV_DONTNEED	4		/* don't need these pages */
+#define MADV_FREE	5		/* free pages only if memory pressure */
 
 /* common parameters: try to keep these consistent across architectures */
 #define MADV_REMOVE	9		/* remove these pages & resources */
-- 
1.9.3
--
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