diff options
| author | Anton Blanchard <anton@samba.org> | 2015-10-29 01:44:05 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-01 03:52:25 +0100 |
| commit | dc4fbba11e4661a6a77a1f89ba32f9082e6395ff (patch) | |
| tree | 567037dc8e93063615e558eda1c80f8a82154749 /arch/powerpc/kernel | |
| parent | powerpc: Create msr_check_and_{set,clear}() (diff) | |
| download | linux-dc4fbba11e4661a6a77a1f89ba32f9082e6395ff.tar.xz linux-dc4fbba11e4661a6a77a1f89ba32f9082e6395ff.zip | |
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.c | 2 |
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; |