On 27/10/20 15:46, Valdis Klētnieks wrote: > This died a horrid death on my laptop when building with W=1. > > CC arch/x86/kvm/mmu/tdp_iter.o > In file included from arch/x86/kvm/mmu/tdp_iter.c:5: > arch/x86/kvm/mmu/spte.h:120:18: error: 'shadow_nonpresent_or_rsvd_mask_len' > defined but not used [-Werror=unused-const-variable=] > 120 | static const u64 shadow_nonpresent_or_rsvd_mask_len = 5; > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/x86/kvm/mmu/spte.h:115:18: error: 'shadow_acc_track_saved_bits_shift' > defined but not used [-Werror=unused-const-variable=] > 115 | static const u64 shadow_acc_track_saved_bits_shift = > PT64_SECOND_AVAIL_BITS_SHIFT; > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/x86/kvm/mmu/spte.h:113:18: error: 'shadow_acc_track_saved_bits_mask' > defined but not used [-Werror=unused-const-variable=] > 113 | static const u64 shadow_acc_track_saved_bits_mask = > PT64_EPT_READABLE_MASK | > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > cc1: all warnings being treated as errors > make[2]: *** [scripts/Makefile.build:283: arch/x86/kvm/mmu/tdp_iter.o] Error 1 > make[1]: *** [scripts/Makefile.build:500: arch/x86/kvm] Error 2 > make: *** [Makefile:1799: arch/x86] Error 2 > > Do we really need to define 3 static variables in every .c file that includes > this .h file, directly or not?
I'd expect the compiler to get rid of them, but I will change them to #defines to fix the warnings. Paolo
