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| author | Oliver O'Halloran <[email protected]> | 2016-03-07 22:08:47 +0000 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2016-03-29 01:08:08 +0000 |
| commit | 01d7c2a2de47890934faba91a71d183795e4348d (patch) | |
| tree | 92b4a3070ef4156cccb042d20144952c4b552497 /drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | |
| parent | powerpc/mm: Fixup preempt underflow with huge pages (diff) | |
| download | kernel-01d7c2a2de47890934faba91a71d183795e4348d.tar.gz kernel-01d7c2a2de47890934faba91a71d183795e4348d.zip | |
powerpc/process: Fix altivec SPR not being saved
In save_sprs() in process.c contains the following test:
if (cpu_has_feature(cpu_has_feature(CPU_FTR_ALTIVEC)))
t->vrsave = mfspr(SPRN_VRSAVE);
CPU feature with the mask 0x1 is CPU_FTR_COHERENT_ICACHE so the test
is equivilent to:
if (cpu_has_feature(CPU_FTR_ALTIVEC) &&
cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
On CPUs without support for both (i.e G5) this results in vrsave not
being saved between context switches. The vector register save/restore
code doesn't use VRSAVE to determine which registers to save/restore,
but the value of VRSAVE is used to determine if altivec is being used
in several code paths.
Fixes: 152d523e6307 ("powerpc: Create context switch helpers save_sprs() and restore_sprs()")
Cc: [email protected]
Signed-off-by: Oliver O'Halloran <[email protected]>
Signed-off-by: Anton Blanchard <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_object.c')
0 files changed, 0 insertions, 0 deletions