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| author | Oliver O'Halloran <oohall@gmail.com> | 2016-03-07 22:08:47 (GMT) |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-29 01:08:08 (GMT) |
| commit | 01d7c2a2de47890934faba91a71d183795e4348d (patch) | |
| tree | 92b4a3070ef4156cccb042d20144952c4b552497 /tools | |
| parent | 08a5bb2921e490939f78f38fd0d02858bb709942 (diff) | |
| download | linux-01d7c2a2de47890934faba91a71d183795e4348d.tar.xz | |
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: stable@vger.kernel.org
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions