powerpc: Fix VSX enabling/flushing to also test MSR_FP and MSR_VEC
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 16 Aug 2017 06:01:14 +0000 (16:01 +1000)
committerMichael Ellerman <mpe@ellerman.id.au>
Wed, 16 Aug 2017 09:35:54 +0000 (19:35 +1000)
commit5a69aec945d27e78abac9fd032533d3aaebf7c1e
treec5dde66bc1e715b8bc0e30fe872828d931a88038
parent96ea91e7b6ee2c406598d859e7348b4829404eea
powerpc: Fix VSX enabling/flushing to also test MSR_FP and MSR_VEC

VSX uses a combination of the old vector registers, the old FP
registers and new "second halves" of the FP registers.

Thus when we need to see the VSX state in the thread struct
(flush_vsx_to_thread()) or when we'll use the VSX in the kernel
(enable_kernel_vsx()) we need to ensure they are all flushed into
the thread struct if either of them is individually enabled.

Unfortunately we only tested if the whole VSX was enabled, not if they
were individually enabled.

Fixes: 72cd7b44bc99 ("powerpc: Uncomment and make enable_kernel_vsx() routine available")
Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/kernel/process.c