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@@ -33,6 +33,7 @@
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/smp.h>
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+#include <linux/smp_lock.h>
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#include <linux/major.h>
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#include <linux/fs.h>
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#include <linux/smp_lock.h>
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@@ -107,15 +108,23 @@ static ssize_t cpuid_read(struct file *file, char __user *buf,
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static int cpuid_open(struct inode *inode, struct file *file)
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{
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- unsigned int cpu = iminor(file->f_path.dentry->d_inode);
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- struct cpuinfo_x86 *c = &cpu_data(cpu);
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-
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- if (cpu >= NR_CPUS || !cpu_online(cpu))
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- return -ENXIO; /* No such CPU */
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+ unsigned int cpu;
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+ struct cpuinfo_x86 *c;
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+ int ret = 0;
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+
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+ lock_kernel();
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+
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+ cpu = iminor(file->f_path.dentry->d_inode);
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+ if (cpu >= NR_CPUS || !cpu_online(cpu)) {
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+ ret = -ENXIO; /* No such CPU */
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+ goto out;
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+ }
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+ c = &cpu_data(cpu);
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if (c->cpuid_level < 0)
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- return -EIO; /* CPUID not supported */
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-
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- return 0;
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+ ret = -EIO; /* CPUID not supported */
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+out:
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+ unlock_kernel();
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+ return ret;
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}
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/*
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