Messages in this thread | | | Date | Sat, 27 Jan 2007 11:05:53 +0200 | From | Avi Kivity <> | Subject | Re: [PATCH] KVM: 'asm' operand has impossible constraints |
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S.Çağlar Onur wrote: > Hi; > > -rc6 fails with latest gcc 4.2 snapshot as following; > > CC [M] drivers/kvm/svm.o > drivers/kvm/svm.c:206: warning: 'inject_db' defined but not used > drivers/kvm/svm.c: In function 'svm_vcpu_run': > drivers/kvm/kvm.h:560: error: 'asm' operand has impossible constraints > make[2]: *** [drivers/kvm/svm.o] Error 1 > make[1]: *** [drivers/kvm] Error 2 > make: *** [drivers] Error 2 > > And according to this thread http://lkml.org/lkml/2006/11/11/129, solution is > converting g to rm, patch follows > >
The patch looks correct, but I don't understand the gcc error message. Are we sure this isn't a gcc 4.2 bug?
"g" appears to be equivalent to "rmi", if "i" is impossible, gcc is free to use "r" or "m", no?
> Signed-off-by: S.Çağlar Onur <caglar@pardus.org.tr> > > Index: linux-2.6/drivers/kvm/kvm.h > =================================================================== > --- linux-2.6.orig/drivers/kvm/kvm.h 2007-01-26 01:38:35.000000000 +0200 > +++ linux-2.6/drivers/kvm/kvm.h 2007-01-26 01:37:48.000000000 +0200 > @@ -557,7 +557,7 @@ > #ifndef load_ldt > static inline void load_ldt(u16 sel) > { > - asm ("lldt %0" : : "g"(sel)); > + asm ("lldt %0" : : "rm"(sel)); > } > #endif > > >
-- Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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