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MIPS: ptrace: Avoid smp_processor_id() when retrieving FPU IR

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Whenever ptrace attempts to retrieve the FPU implementation register it
accesses it through current_cpu_data, which calls smp_processor_id().
Since the code may execute with preemption enabled, this can trigger
a warning. Fix this by using boot_cpu_data to get the IR instead.

Signed-off-by: Alex Smith <alex@alex-smith.me.uk>
Cc: <stable@vger.kernel.org> # v3.15+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7449/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Alex Smith 2014-07-23 14:40:06 +01:00 committed by Ralf Baechle
parent 6ee1d93455
commit 656ff9bef0
2 changed files with 3 additions and 3 deletions
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4
arch/mips/kernel/ptrace.c
View file

@ -129,7 +129,7 @@ int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
}
__put_user(child->thread.fpu.fcr31, data + 64);
__put_user(current_cpu_data.fpu_id, data + 65);
__put_user(boot_cpu_data.fpu_id, data + 65);
return 0;
}
@ -480,7 +480,7 @@ long arch_ptrace(struct task_struct *child, long request,
break;
case FPC_EIR:
/* implementation / version register */
tmp = current_cpu_data.fpu_id;
tmp = boot_cpu_data.fpu_id;
break;
case DSP_BASE ... DSP_BASE + 5: {
dspreg_t *dregs;

2
arch/mips/kernel/ptrace32.c
View file

@ -129,7 +129,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
break;
case FPC_EIR:
/* implementation / version register */
tmp = current_cpu_data.fpu_id;
tmp = boot_cpu_data.fpu_id;
break;
case DSP_BASE ... DSP_BASE + 5: {
dspreg_t *dregs;