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SubjectRe: [PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()
Hi Eric,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc5 next-20180316]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Eric-Dumazet/x86-msr-add-rdmsr_safe_on_cpu_resched-and-use-it-in-msr_read/20180319-001007
config: i386-randconfig-s1-201811 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

arch/x86/kernel/msr.c: In function 'msr_read':
>> arch/x86/kernel/msr.c:63:9: error: implicit declaration of function 'rdmsr_safe_on_cpu_resched' [-Werror=implicit-function-declaration]
err = rdmsr_safe_on_cpu_resched(cpu, reg, &data[0], &data[1]);
^~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/rdmsr_safe_on_cpu_resched +63 arch/x86/kernel/msr.c

48
49 static ssize_t msr_read(struct file *file, char __user *buf,
50 size_t count, loff_t *ppos)
51 {
52 u32 __user *tmp = (u32 __user *) buf;
53 u32 data[2];
54 u32 reg = *ppos;
55 int cpu = iminor(file_inode(file));
56 int err = 0;
57 ssize_t bytes = 0;
58
59 if (count % 8)
60 return -EINVAL; /* Invalid chunk size */
61
62 for (; count; count -= 8) {
> 63 err = rdmsr_safe_on_cpu_resched(cpu, reg, &data[0], &data[1]);
64 if (err)
65 break;
66 if (copy_to_user(tmp, &data, 8)) {
67 err = -EFAULT;
68 break;
69 }
70 tmp += 2;
71 bytes += 8;
72 }
73
74 return bytes ? bytes : err;
75 }
76

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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