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The code is actually able to gracefully fallback if the syscall number of riscv_hwprobe is not available at build time, but it still depended on the <asm/hwprobe.h> header unconditionally. In certain environments such as one of crosstool-NG's Canadian Cross build step (binutils for host), or one with very outdated kernel headers, the header will not be present, causing the build to fail. While the relevant projects/environments should be fixed nevertheless, a configure-time check for <asm/hwprobe.h> is helpful for fixing gprofng builds with released versions of ct-ng etc. Signed-off-by: WANG Xuerui <git@xen0n.name>