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authorAnton Blanchard <anton@samba.org>2015-10-29 11:44:05 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2015-12-01 13:52:25 +1100
commitdc4fbba11e4661a6a77a1f89ba32f9082e6395ff (patch)
tree567037dc8e93063615e558eda1c80f8a82154749 /arch/powerpc/lib/vmx-helper.c
parenta0e72cf12b1a1f159b6822ed2e1e41893d996fc7 (diff)
powerpc: Create disable_kernel_{fp,altivec,vsx,spe}()
The enable_kernel_*() functions leave the relevant MSR bits enabled until we exit the kernel sometime later. Create disable versions that wrap the kernel use of FP, Altivec VSX or SPE. While we don't want to disable it normally for performance reasons (MSR writes are slow), it will be used for a debug boot option that does this and catches bad uses in other areas of the kernel. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/lib/vmx-helper.c')
-rw-r--r--arch/powerpc/lib/vmx-helper.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/lib/vmx-helper.c b/arch/powerpc/lib/vmx-helper.c
index ac93a3bd2730..b27e030fc9f8 100644
--- a/arch/powerpc/lib/vmx-helper.c
+++ b/arch/powerpc/lib/vmx-helper.c
@@ -46,6 +46,7 @@ int enter_vmx_usercopy(void)
*/
int exit_vmx_usercopy(void)
{
+ disable_kernel_altivec();
pagefault_enable();
preempt_enable();
return 0;
@@ -70,6 +71,7 @@ int enter_vmx_copy(void)
*/
void *exit_vmx_copy(void *dest)
{
+ disable_kernel_altivec();
preempt_enable();
return dest;
}