[POWERPC] Flush registers to proper task context

When we flush register state for FP, Altivec, or SPE in flush_*_to_thread
we need to respect the task_struct that the caller has passed to us.

Most cases we are called with current, however sometimes (ptrace) we may
be passed a different task_struct.

This showed up when using gdbserver debugging a simple program that used
floating point. When gdb tried to show the FP regs they all showed up as
0, because the child's FP registers were never properly flushed to memory.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index a83727b308a0186e8a5dfadc06fd2be687029834..e477c9d0498bed92efd0ebad78db4db4187afd9f 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -83,7 +83,7 @@ void flush_fp_to_thread(struct task_struct *tsk)
                         */
                        BUG_ON(tsk != current);
 #endif
-                       giveup_fpu(current);
+                       giveup_fpu(tsk);
                }
                preempt_enable();
        }
@@ -143,7 +143,7 @@ void flush_altivec_to_thread(struct task_struct *tsk)
 #ifdef CONFIG_SMP
                        BUG_ON(tsk != current);
 #endif
-                       giveup_altivec(current);
+                       giveup_altivec(tsk);
                }
                preempt_enable();
        }
@@ -182,7 +182,7 @@ void flush_spe_to_thread(struct task_struct *tsk)
 #ifdef CONFIG_SMP
                        BUG_ON(tsk != current);
 #endif
-                       giveup_spe(current);
+                       giveup_spe(tsk);
                }
                preempt_enable();
        }