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$ make
...
In file included from arch/x86/kvm/dsm.h:6:0,
                 from arch/x86/kvm/x86.c:25:
arch/x86/kvm/dsm-util.h: In function ‘jhash32’:
arch/x86/kvm/dsm-util.h:90:9: error: implicit declaration of function ‘jhash’; did you mean ‘jhash32’? [-Werror=implicit-function-declaration]
  return jhash(s, n, JHASH_INITVAL);
         ^~~~~
         jhash32
arch/x86/kvm/dsm-util.h:90:21: error: ‘JHASH_INITVAL’ undeclared (first use in this function); did you mean ‘DSM_INITIAL’?
  return jhash(s, n, JHASH_INITVAL);
                     ^~~~~~~~~~~~~
                     DSM_INITIAL
arch/x86/kvm/dsm-util.h:90:21: note: each undeclared identifier is reported only once for each function it appears in

diff --git a/arch/x86/kvm/dsm-util.h b/arch/x86/kvm/dsm-util.h
index 7508d950..4cdc8d44 100644
--- a/arch/x86/kvm/dsm-util.h
+++ b/arch/x86/kvm/dsm-util.h
@@ -2,6 +2,7 @@
 #define ARCH_X86_KVM_DSM_UTIL_H
 
 #include <linux/kvm_host.h>
+#include <linux/jhash.h>
 
 #define DSM_INITIAL     0
 #define DSM_INVALID     1

#define USE_KTCP_NETWORK

$ make
...
arch/x86/kvm/krdma.c: In function ‘krdma_connect_single’:
arch/x86/kvm/krdma.c:325:2: warning: ignoring return value of ‘kstrtol’, declared with attribute warn_unused_result [-Wunused-result]
  kstrtol(port, 10, &portdec);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/kvm/krdma.c: In function ‘krdma_listen’:
arch/x86/kvm/krdma.c:550:2: warning: ignoring return value of ‘kstrtol’, declared with attribute warn_unused_result [-Wunused-result]
  kstrtol(port, 10, &portdec);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
  CC      arch/x86/kvm/dsm.o
arch/x86/kvm/dsm.c: In function ‘kvm_dsm_init’:
arch/x86/kvm/dsm.c:573:19: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
  network_ops.send = ktcp_send;
                   ^
arch/x86/kvm/dsm.c:574:22: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
  network_ops.receive = ktcp_receive;
                      ^
arch/x86/kvm/dsm.c:553:2: warning: ignoring return value of ‘copy_from_user’, declared with attribute warn_unused_result [-Wunused-result]
  copy_from_user(user_cluster_iplist, params->cluster_iplist, sizeof(void *) *
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    params->cluster_iplist_len);
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/kvm/dsm.c:561:3: warning: ignoring return value of ‘strncpy_from_user’, declared with attribute warn_unused_result [-Wunused-result]
   strncpy_from_user(kvm->arch.cluster_iplist[i], user_cluster_iplist[i], 20);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
scripts/Makefile.build:293: recipe for target 'arch/x86/kvm/dsm.o' failed
make[2]: *** [arch/x86/kvm/dsm.o] Error 1
scripts/Makefile.build:544: recipe for target 'arch/x86/kvm' failed
make[1]: *** [arch/x86/kvm] Error 2
Makefile:995: recipe for target 'arch/x86' failed
make: *** [arch/x86] Error 2