__riscv_hwprobe: don't try to set errno.
When used in an ifunc resolver, errno@plt won't be available. This is
the API the rivos folks contributing to glibc are leaning towards, for
the same reason. Hit by the berberis folks because they don't implement
the syscall so they were trying to set errno to ENOSYS.
Tested by looking at the generated assembler, and also disabling the
vdso (since on actual systems, this will go via the vdso).
Test: treehugger
Change-Id: Ie2779110f141f20efe97cb892fbdefd808b5339b
diff --git a/libc/include/sys/hwprobe.h b/libc/include/sys/hwprobe.h
index f2fd98d..b1a8400 100644
--- a/libc/include/sys/hwprobe.h
+++ b/libc/include/sys/hwprobe.h
@@ -49,7 +49,7 @@
*
* A `__cpu_count` of 0 and null `__cpus` means "all online cpus".
*
- * Returns 0 on success and returns -1 and sets `errno` on failure.
+ * Returns 0 on success and returns an error number on failure.
*/
int __riscv_hwprobe(struct riscv_hwprobe* _Nonnull __pairs, size_t __pair_count, size_t __cpu_count, unsigned long* _Nullable __cpus, unsigned __flags);