diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2006-02-15 21:16:42 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:13:08 -0800 |
| commit | a7b31bac691668a60da8b9892124b7da408e0a0e (patch) | |
| tree | 2bdf523086234a5cb9e943e45df879f1f264a516 | |
| parent | de635d833f61ce0f2ad0b3431e6a3323a1c4fed5 (diff) | |
[SPARC64]: Do not write garbage into %pstate in tsb_context_switch().
For SUN4V, we were clobbering %o5 to do the hypervisor call.
This clobbers the saved %pstate value and we end up writing
garbage into that register as a result. Oops.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | arch/sparc64/kernel/tsb.S | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S index be8f0892d72..7996c9d6670 100644 --- a/arch/sparc64/kernel/tsb.S +++ b/arch/sparc64/kernel/tsb.S @@ -265,13 +265,19 @@ __tsb_context_switch: mov SCRATCHPAD_UTSBREG2, %g1 stxa %g2, [%g1] ASI_SCRATCHPAD + /* Save away %o5's %pstate, we have to use %o5 for + * the hypervisor call. + */ + mov %o5, %g1 + mov HV_FAST_MMU_TSB_CTXNON0, %o5 mov 1, %o0 mov %o4, %o1 ta HV_FAST_TRAP + /* Finish up and restore %o5. */ ba,pt %xcc, 9f - nop + mov %g1, %o5 /* SUN4U TSB switch. */ 1: mov TSB_REG, %g1 |