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POWERPC: Flush registers to proper task context

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commit 0ee6c15e7b in mainline.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kumar Gala
2007-08-28 21:15:53 -05:00
committed by Greg Kroah-Hartman
parent 51718d5055
commit fee40b38d9
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/powerpc/kernel/process.c
+3 -3
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@@ -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();
}