powerpc: Allow 64bit VDSO __kernel_sync_dicache to work across ranges >4GB
commit f9ec11165301982585e5e5f606739b5bae5331f3 upstream. When calling __kernel_sync_dicache with a size >4GB, we were masking off the upper 32 bits, so we would incorrectly flush a range smaller than intended. This patch replaces the 32 bit shifts with 64 bit ones, so that the full size is accounted for. Signed-off-by: NAlastair D'Silva <alastair@d-silva.org> Cc: stable@vger.kernel.org Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191104023305.9581-3-alastair@au1.ibm.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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