On Wed, Oct 09, 2024 at 08:49:42AM -0700, Sean Christopherson wrote: > Return a uint64_t from vcpu_get_reg() instead of having the caller provide > a pointer to storage, as none of the vcpu_get_reg() usage in KVM selftests > accesses a register larger than 64 bits, and vcpu_set_reg() only accepts a > 64-bit value. If a use case comes along that needs to get a register that > is larger than 64 bits, then a utility can be added to assert success and > take a void pointer, but until then, forcing an out param yields ugly code > and prevents feeding the output of vcpu_get_reg() into vcpu_set_reg(). This commit, which is in today's -next as 5c6c7b71a45c9c, breaks the build on arm64: aarch64/psci_test.c: In function ‘host_test_system_off2’: aarch64/psci_test.c:247:9: error: too many arguments to function ‘vcpu_get_reg’ 247 | vcpu_get_reg(target, KVM_REG_ARM_PSCI_VERSION, &psci_version); | ^~~~~~~~~~~~ In file included from aarch64/psci_test.c:18: include/kvm_util.h:705:24: note: declared here 705 | static inline uint64_t vcpu_get_reg(struct kvm_vcpu *vcpu, uint64_t id) | ^~~~~~~~~~~~ At top level: cc1: note: unrecognized command-line option ‘-Wno-gnu-variable-sized-type-not-at -end’ may have been intended to silence earlier diagnostics since the updates done to that file did not take account of 72be5aa6be4 ("KVM: selftests: Add test for PSCI SYSTEM_OFF2") which has been merged in the kvm-arm64 tree.
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