linux-kernel - [PATCH v1 04/30] powerpc/vdso: Remove get_page() in vdso

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Date:   Sun, 27 Sep 2020 09:16:21 +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 04/30] 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 | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 6d106fcafb9e..dfaa4be258d2 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -748,7 +748,7 @@ static int __init vdso_init(void)
 	BUG_ON(vdso32_pagelist == NULL);
 	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;
 	}
 	vdso32_pagelist[i++] = virt_to_page(vdso_data);
@@ -761,15 +761,13 @@ static int __init vdso_init(void)
 	BUG_ON(vdso64_pagelist == NULL);
 	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;
 	}
 	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