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x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_*

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Add API to change vdso blob type with arch_prctl.
As this is usefull only by needs of CRIU, expose
this interface under CONFIG_CHECKPOINT_RESTORE.

Signed-off-by: Dmitry Safonov <[email protected]>
Acked-by: Andy Lutomirski <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Dmitry Safonov 2016-09-05 16:33:05 +03:00 • committed by Thomas Gleixner
commit 2eefd87896
6 changed files with 78 additions and 10 deletions
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8
mm/mmap.c
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@ -3063,6 +3063,14 @@ out:
return ERR_PTR(ret);
}
bool vma_is_special_mapping(const struct vm_area_struct *vma,
const struct vm_special_mapping *sm)
{
return vma->vm_private_data == sm &&
(vma->vm_ops == &special_mapping_vmops ||
vma->vm_ops == &legacy_special_mapping_vmops);
}
/*
* Called with mm->mmap_sem held for writing.
* Insert a new vma covering the given region, with the given flags.