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powerpc/vdso: Move vdso datapage up front

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Move the vdso datapage in front of the VDSO area,
before vdso test.

This will allow to remove the __kernel_datapage_offset symbol
and simplify __get_datapage() in following patches.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b68c99b6e8ee0b1d99bfa4c7e34c359fc1bc1000.1601197618.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-09-27 09:16:30 +00:00 committed by Michael Ellerman
parent c102f07667
commit 511157ab64
2 changed files with 8 additions and 8 deletions
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2
arch/powerpc/include/asm/mmu_context.h
View file

@ -262,7 +262,7 @@ extern void arch_exit_mmap(struct mm_struct *mm);
static inline void arch_unmap(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
unsigned long vdso_base = (unsigned long)mm->context.vdso;
unsigned long vdso_base = (unsigned long)mm->context.vdso - PAGE_SIZE;
if (start <= vdso_base && vdso_base < end)
mm->context.vdso = NULL;

14
arch/powerpc/kernel/vdso.c
View file

@ -123,7 +123,7 @@ static int vdso_mremap(const struct vm_special_mapping *sm, struct vm_area_struc
if (new_size != text_size + PAGE_SIZE)
return -EINVAL;
current->mm->context.vdso = (void __user *)new_vma->vm_start;
current->mm->context.vdso = (void __user *)new_vma->vm_start + PAGE_SIZE;
return 0;
}
@ -198,7 +198,7 @@ static int __arch_setup_additional_pages(struct linux_binprm *bprm, int uses_int
* install_special_mapping or the perf counter mmap tracking code
* will fail to recognise it as a vDSO.
*/
mm->context.vdso = (void __user *)vdso_base;
mm->context.vdso = (void __user *)vdso_base + PAGE_SIZE;
/*
* our vma flags don't have VM_WRITE so by default, the process isn't
@ -507,7 +507,7 @@ static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
return -1;
}
*((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
(vdso64_pages << PAGE_SHIFT) -
-PAGE_SIZE -
(sym64->st_value - VDSO64_LBASE);
#endif /* CONFIG_PPC64 */
@ -519,7 +519,7 @@ static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
return -1;
}
*((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
(vdso32_pages << PAGE_SHIFT) -
-PAGE_SIZE -
(sym32->st_value - VDSO32_LBASE);
#endif
@ -693,10 +693,10 @@ static struct page ** __init vdso_setup_pages(void *start, void *end)
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[0] = virt_to_page(vdso_data);
pagelist[i] = virt_to_page(vdso_data);
for (i = 0; i < pages; i++)
pagelist[i + 1] = virt_to_page(start + i * PAGE_SIZE);
return pagelist;
}