linux-kernel - [PATCH v1 2/9] powerpc/vdso: Remove get_page() in vdso

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Message-Id: <9a113acfcef5ccb5413e419c0d114140361ac0e1.1598363608.git.christophe.leroy@csgroup.eu>
Date:   Tue, 25 Aug 2020 13:54:00 +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 2/9] powerpc/vdso: Remove get_page() in vdso_pagelist
 initialization

Partly copied from commit 16fb1a9bec61 ("arm64: vdso: clean up
vdso_pagelist initialization").

No need to get_page() the vdso text/data - these are part of the
kernel image.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/vdso.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 88a4a02ed4c4..3bc4d5b1980b 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -757,11 +757,9 @@ static int __init vdso_init(void)
 	if (!vdso32_pagelist)
 		goto alloc_failed;
 
-	for (i = 0; i < vdso32_pages; i++) {
-		struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
-		get_page(pg);
-		vdso32_pagelist[i] = pg;
-	}
+	for (i = 0; i < vdso32_pages; i++)
+		vdso32_pagelist[i] = virt_to_page(vdso32_kbase + i * PAGE_SIZE);
+
 	vdso32_pagelist[i++] = virt_to_page(vdso_data);
 	vdso32_pagelist[i] = NULL;
 #endif
@@ -772,17 +770,13 @@ static int __init vdso_init(void)
 	if (!vdso64_pagelist)
 		goto alloc_failed;
 
-	for (i = 0; i < vdso64_pages; i++) {
-		struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
-		get_page(pg);
-		vdso64_pagelist[i] = pg;
-	}
+	for (i = 0; i < vdso64_pages; i++)
+		vdso64_pagelist[i] = virt_to_page(vdso64_kbase + i * PAGE_SIZE);
+
 	vdso64_pagelist[i++] = virt_to_page(vdso_data);
 	vdso64_pagelist[i] = NULL;
 #endif /* CONFIG_PPC64 */
 
-	get_page(virt_to_page(vdso_data));
-
 	smp_wmb();
 	vdso_ready = 1;
 
-- 
2.25.0