Quoting Jani Nikula (2018-10-16 13:29:37) > When building the kernel with Clang with defconfig and CONFIG_64BIT > disabled, vmlinux fails to link because of the BUILD_BUG in > _print_param. > > ld: drivers/gpu/drm/i915/i915_params.o: in function `i915_params_dump': > i915_params.c:(.text+0x56): undefined reference to > `__compiletime_assert_191' > > This function is semantically invalid unless the code is first inlined > then constant folded, which doesn't work for Clang because semantic > analysis happens before optimization/inlining. > > [The above written by Nathan Chancellor <natechancellor@xxxxxxxxx>] > > Use WARN_ONCE() instead of BUILD_BUG() to avoid the problem. The > WARN_ONCE() should get optimized away unless there's a type that's not > handled by _print_param(). > > References: https://github.com/ClangBuiltLinux/linux/issues/191 > References: http://mid.mail-archive.com/20181009171401.14980-1-natechancellor@xxxxxxxxx > Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Cc: Nathan Chancellor <natechancellor@xxxxxxxxx> > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Reported-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Reported-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Fair enough, Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
