tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/timers head: 950e7481b09cd3f426a9322b0f35139224660c0d commit: 9ad337981a09fb5e53884f6614eb277e1f782460 [8/13] x86/tsc: Store and check TSC ADJUST MSR config: i386-alldefconfig (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout 9ad337981a09fb5e53884f6614eb277e1f782460 # save the attached .config to linux build tree make ARCH=i386
All errors (new ones prefixed by >>):
In file included from include/linux/kernel.h:13:0,
from include/linux/cpumask.h:9,
from include/linux/topology.h:30,
from arch/x86/kernel/tsc_sync.c:17:
arch/x86/kernel/tsc_sync.c: In function 'tsc_store_and_check_tsc_adjust':
>> arch/x86/kernel/tsc_sync.c:43:43: error: 'cpu' undeclared (first use in this
>> function)
pr_info("TSC ADJUST: Boot CPU%u: %lld\n",cpu, bootval);
^
include/linux/printk.h:284:34: note: in definition of macro 'pr_info'
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~~
arch/x86/kernel/tsc_sync.c:43:43: note: each undeclared identifier is
reported only once for each function it appears in
pr_info("TSC ADJUST: Boot CPU%u: %lld\n",cpu, bootval);
^
include/linux/printk.h:284:34: note: in definition of macro 'pr_info'
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~~
arch/x86/kernel/tsc_sync.c:34:21: warning: unused variable 'ref'
[-Wunused-variable]
struct tsc_adjust *ref, *cur = this_cpu_ptr(&tsc_adjust);
^~~
vim +/cpu +43 arch/x86/kernel/tsc_sync.c
11 * CPU is the 'target CPU'.
12 *
13 * Only two CPUs may participate - they can enter in any order.
14 * ( The serial nature of the boot logic and the CPU hotplug lock
15 * protects against more than 2 CPUs entering this code. )
16 */
> 17 #include <linux/topology.h>
18 #include <linux/spinlock.h>
19 #include <linux/kernel.h>
20 #include <linux/smp.h>
21 #include <linux/nmi.h>
22 #include <asm/tsc.h>
23
24 struct tsc_adjust {
25 s64 bootval;
26 s64 adjusted;
27 };
28
29 static DEFINE_PER_CPU(struct tsc_adjust, tsc_adjust);
30
31 #ifndef CONFIG_SMP
32 void __init tsc_store_and_check_tsc_adjust(void)
33 {
34 struct tsc_adjust *ref, *cur = this_cpu_ptr(&tsc_adjust);
35 s64 bootval;
36
37 if (!boot_cpu_has(X86_FEATURE_TSC_ADJUST))
38 return;
39
40 rdmsrl(MSR_IA32_TSC_ADJUST, bootval);
41 cur->bootval = bootval;
42 cur->adjusted = bootval;
> 43 pr_info("TSC ADJUST: Boot CPU%u: %lld\n",cpu, bootval);
44 }
45
46 #else /* !CONFIG_SMP */
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