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