linux-kernel - [PATCHv3 4/8] powerpc/vdso: introduce init_vdso{32,64}

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Message-ID: <20161027170948.8279-5-dsafonov@virtuozzo.com>
Date:   Thu, 27 Oct 2016 20:09:44 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Dmitry Safonov <dsafonov@...tuozzo.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        Andy Lutomirski <luto@...capital.net>,
        "Oleg Nesterov" <oleg@...hat.com>, <linuxppc-dev@...ts.ozlabs.org>,
        <linux-mm@...ck.org>
Subject: [PATCHv3 4/8] powerpc/vdso: introduce init_vdso{32,64}_pagelist

Impact: cleanup

Move allocation/initialization of vDSO's pagelist for 32/64-bit vDSO
into common vdso code, introducing a function for that.

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-mm@...ck.org
Signed-off-by: Dmitry Safonov <dsafonov@...tuozzo.com>
---
 arch/powerpc/kernel/vdso.c        | 27 ++-------------------------
 arch/powerpc/kernel/vdso_common.c | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 8010a0d82049..25d03d773c49 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -382,8 +382,6 @@ early_initcall(vdso_getcpu_init);
 
 static int __init vdso_init(void)
 {
-	int i;
-
 #ifdef CONFIG_PPC64
 	/*
 	 * Fill up the "systemcfg" stuff for backward compatibility
@@ -454,32 +452,11 @@ static int __init vdso_init(void)
 	}
 
 #ifdef CONFIG_VDSO32
-	/* Make sure pages are in the correct state */
-	vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
-				  GFP_KERNEL);
-	BUG_ON(vdso32_pagelist == NULL);
-	for (i = 0; i < vdso32_pages; i++) {
-		struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
-		ClearPageReserved(pg);
-		get_page(pg);
-		vdso32_pagelist[i] = pg;
-	}
-	vdso32_pagelist[i++] = virt_to_page(vdso_data);
-	vdso32_pagelist[i] = NULL;
+	init_vdso32_pagelist();
 #endif
 
 #ifdef CONFIG_PPC64
-	vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
-				  GFP_KERNEL);
-	BUG_ON(vdso64_pagelist == NULL);
-	for (i = 0; i < vdso64_pages; i++) {
-		struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
-		ClearPageReserved(pg);
-		get_page(pg);
-		vdso64_pagelist[i] = pg;
-	}
-	vdso64_pagelist[i++] = virt_to_page(vdso_data);
-	vdso64_pagelist[i] = NULL;
+	init_vdso64_pagelist();
 #endif /* CONFIG_PPC64 */
 
 	get_page(virt_to_page(vdso_data));
diff --git a/arch/powerpc/kernel/vdso_common.c b/arch/powerpc/kernel/vdso_common.c
index ac25d66134fb..c97c30606b3f 100644
--- a/arch/powerpc/kernel/vdso_common.c
+++ b/arch/powerpc/kernel/vdso_common.c
@@ -14,6 +14,7 @@
 #define VDSO_LBASE	CONCAT3(VDSO, BITS, _LBASE)
 #define vdso_kbase	CONCAT3(vdso, BITS, _kbase)
 #define vdso_pages	CONCAT3(vdso, BITS, _pages)
+#define vdso_pagelist	CONCAT3(vdso, BITS, _pagelist)
 
 #undef pr_fmt
 #define pr_fmt(fmt)	"vDSO" __stringify(BITS) ": " fmt
@@ -202,6 +203,25 @@ static __init int vdso_setup(struct lib_elfinfo *v)
 	return 0;
 }
 
+#define init_vdso_pagelist CONCAT3(init_vdso, BITS, _pagelist)
+static __init void init_vdso_pagelist(void)
+{
+	int i;
+
+	/* Make sure pages are in the correct state */
+	vdso_pagelist = kzalloc(sizeof(struct page *) * (vdso_pages + 2),
+				  GFP_KERNEL);
+	BUG_ON(vdso_pagelist == NULL);
+	for (i = 0; i < vdso_pages; i++) {
+		struct page *pg = virt_to_page(vdso_kbase + i*PAGE_SIZE);
+
+		ClearPageReserved(pg);
+		get_page(pg);
+		vdso_pagelist[i] = pg;
+	}
+	vdso_pagelist[i++] = virt_to_page(vdso_data);
+	vdso_pagelist[i] = NULL;
+}
 
 #undef find_section
 #undef find_symbol
@@ -211,10 +231,12 @@ static __init int vdso_setup(struct lib_elfinfo *v)
 #undef vdso_fixup_datapage
 #undef vdso_fixup_features
 #undef vdso_setup
+#undef init_vdso_pagelist
 
 #undef VDSO_LBASE
 #undef vdso_kbase
 #undef vdso_pages
+#undef vdso_pagelist
 #undef lib_elfinfo
 #undef BITS
 #undef _CONCAT3
-- 
2.10.1