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@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/269ffb54c37fc1d46128f77d7a39f88ef4a9957d.1601197618.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index d2c08f5..d129d7e 100644 (file)
--- 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();