powerpc/mem: Use kmap_local_page() in flushing functions
Flushing functions don't rely on preemption being disabled, so use kmap_local_page() instead of kmap_atomic(). Signed-off-by:Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b6a880ea0ec7886b51edbb4979c188be549231c0.1617895813.git.christophe.leroy@csgroup.eu
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