linux-kernel - [PATCH v1 06/30] powerpc/vdso: Refactor 32 bits and 64 bits pages setup

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Date:   Sun, 27 Sep 2020 09:16:23 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 06/30] powerpc/vdso: Refactor 32 bits and 64 bits pages
 setup

The setup of VDSO pages is identical for 32 bits VDSO and
64 bits VDSO.

Refactor that setup.

And use &vdsoXX_start which is synonym of vdsoXX_kbase.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/vdso.c | 39 +++++++++++++++++++-------------------
 1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index d2c08f5de587..d129d7ee006d 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -678,10 +678,26 @@ int vdso_getcpu_init(void)
 early_initcall(vdso_getcpu_init);
 #endif
 
-static int __init vdso_init(void)
+static struct page ** __init vdso_setup_pages(void *start, void *end)
 {
 	int i;
+	struct page **pagelist;
+	int pages = (end - start) >> PAGE_SHIFT;
+
+	pagelist = kcalloc(pages + 1, sizeof(struct page *), GFP_KERNEL);
+	if (!pagelist)
+		panic("%s: Cannot allocate page list for VDSO", __func__);
+
+	for (i = 0; i < pages; i++)
+		pagelist[i] = virt_to_page(start + i * PAGE_SIZE);
+
+	pagelist[i] = virt_to_page(vdso_data);
+
+	return pagelist;
+}
 
+static int __init vdso_init(void)
+{
 #ifdef CONFIG_PPC64
 	/*
 	 * Fill up the "systemcfg" stuff for backward compatibility
@@ -742,28 +758,11 @@ static int __init vdso_init(void)
 	}
 
 #ifdef CONFIG_VDSO32
-	/* Make sure pages are in the correct state */
-	vdso32_pagelist = kcalloc(vdso32_pages + 1, sizeof(struct page *),
-				  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);
-
-		vdso32_pagelist[i] = pg;
-	}
-	vdso32_pagelist[i++] = virt_to_page(vdso_data);
+	vdso32_pagelist = vdso_setup_pages(&vdso32_start, &vdso32_end);
 #endif
 
 #ifdef CONFIG_PPC64
-	vdso64_pagelist = kcalloc(vdso64_pages + 1, sizeof(struct page *),
-				  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);
-
-		vdso64_pagelist[i] = pg;
-	}
-	vdso64_pagelist[i++] = virt_to_page(vdso_data);
+	vdso64_pagelist = vdso_setup_pages(&vdso64_start, &vdso64_end);
 #endif /* CONFIG_PPC64 */
 
 	smp_wmb();
-- 
2.25.0