On 2011-08-31 01:03, Chris Friesen wrote: > On 08/30/2011 01:59 PM, Jan Kiszka wrote: >> On 2011-08-30 21:39, Chris Friesen wrote: > >>> 2) If I create such a link, it builds a few files, and then gives the >>> following: >>> >>> /home/cfriesen/Download/kvm-kmod-3.0b/x86/x86.c: In function >>> ‘vcpu_enter_guest’: >>> /home/cfriesen/Download/kvm-kmod-3.0b/x86/x86.c:5539:26: error: >>> ‘prof_on’ undeclared (first use in this function) >>> /home/cfriesen/Download/kvm-kmod-3.0b/x86/x86.c:5539:26: note: each >>> undeclared identifier is reported only once for each function it >>> appears in >>> >>> >>> This appears to be due to the fact that KVM_PROFILING is defined >>> unconditionally in my kernel, but "prof_on" is only defined if >>> CONFIG_PROFILING is enabled. Commenting out that chunk of code in x86.c >>> lets everything build. >> >> If CONFIG_PROFILING is off, prof_on is defined to 0. But we may miss >> some include on older kernels. Does adding linux/profile.h to x86.c >> solve the issue as well? > > > It would appear that I got the explanation wrong. CONFIG_PROFILING is > enabled on my kernel. The problem is that our OS vendor has included a > patch to convert prof_on to immediate values, which requires a change in > x86.c. Ah, now I remember: LTTng fallouts. I think there was just some EXPORT_SYMBOL missing in the kernel, but my memory is weak. Jan
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