summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel
diff options
context:
space:
mode:
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/kernel
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/kernel')
-rw-r--r--arch/powerpc/kernel/align.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c
index 86150fbb42c3..8e7cb8e2b21a 100644
--- a/arch/powerpc/kernel/align.c
+++ b/arch/powerpc/kernel/align.c
@@ -960,6 +960,7 @@ int fix_alignment(struct pt_regs *regs)
preempt_disable();
enable_kernel_fp();
cvt_df(&data.dd, (float *)&data.x32.low32);
+ disable_kernel_fp();
preempt_enable();
#else
return 0;
@@ -1000,6 +1001,7 @@ int fix_alignment(struct pt_regs *regs)
preempt_disable();
enable_kernel_fp();
cvt_fd((float *)&data.x32.low32, &data.dd);
+ disable_kernel_fp();
preempt_enable();
#else
return 0;