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powerpc/vdso: Refactor 32 bits and 64 bits pages setup

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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
This commit is contained in:
Christophe Leroy 2020-09-27 09:16:23 +00:00 committed by Michael Ellerman
parent 35c1c7c0bc
commit 3cf6382541
1 changed files with 19 additions and 20 deletions
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39
arch/powerpc/kernel/vdso.c
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@ -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();