Hi, 
I want to add a smooth method in the GMRES routine.  I do it in the function 
KSPSolve_GMRES of  /src/ksp/ksp/impls/gmres/gmres.c. The code likes that:

PetscErrorCode KSPSolve_GMRES(KSP ksp) {
.....
     ierr = GMREScycle(&its,ksp);CHKERRQ(ierr);
     
     ierr = MatRelax(ksp->pc->mat, 
ksp->vec_rhs,1,SOR_FORWARD_SWEEP,0,1,1,ksp->vec_sol);CHKERRQ(ierr);
.....
}

But  compile fail. Is it the right way? 
Thanks.


                
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