From: Kumar Gala Date: Wed, 29 Aug 2007 02:15:53 +0000 (-0500) Subject: [POWERPC] Flush registers to proper task context X-Git-Tag: v2.6.23-rc5~43^2~6 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ee6c15e7ba7b36a217cdadb292eeaf32a057a59;p=linux-2.6 [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 --- diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index a83727b308..e477c9d049 100644 --- 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(); }