# Re: \[PATCH v2 15/17\] selftests: vdso: Fix build of test\_vdso\_chacha

- From: Jason A. Donenfeld \<Jason@zx2c4.com\>
- Date: 2024-08-26 07:33:47 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2024/08/290073
- Thread: https://ratatoskr.run/linuxppc-dev/2024/08/289625/t.md

```text
On Thu, Aug 22, 2024 at 09:13:23AM +0200, Christophe Leroy wrote:
> Replace -isystem by -idirafter
> 
> But this implies that now tools/include/linux/linkage.h is
> included instead of include/linux/linkage.h, so define a stub
> for SYM_FUNC_START() and SYM_FUNC_END().

Thanks! I got step 1, but didn't figure out step 2, and tried to do
things the lazy way instead:

-#include <sodium/crypto_stream_chacha20.h>
 #include <sys/random.h>
 #include <string.h>
 #include <stdint.h>
 #include "../kselftest.h"

 extern void __arch_chacha20_blocks_nostack(uint8_t *dst_bytes, const uint8_t *key, uint32_t *counter, size_t nblocks);
+extern int crypto_stream_chacha20(uint8_t *dst_bytes, uint64_t dst_len, const uint8_t *nonce, const uint8_t *key);


Yours is obviously much better, so I'll queue that up instead.

```