powerpc/vdso: Provide vdso_remap()
Provide vdso_remap() through _install_special_mapping() and drop arch_remap(). This adds a test of the size and returns -EINVAL if the size is not correct. Signed-off-by:Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/373c66f768fa9cc8890f3b55462209a98c522326.1601197618.git.christophe.leroy@csgroup.eu
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c1bab643
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