Subject: linux-next: build failure after merge of the bpf-next tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 18 Apr 2019 11:57:48 +1000

Hi all,

After merging the bpf-next tree, today's linux-next build (powerpc perf)
failed like this:

In file included from xsk.c:32:
libbpf_util.h:49:3: error: #warning Architecture missing native barrier functions in libbpf_util.h. [-Werror=cpp]
 # warning Architecture missing native barrier functions in libbpf_util.h.
   ^~~~~~~
cc1: all warnings being treated as errors

Caused by commit

  b7e3a28019c9 ("libbpf: remove dependency on barrier.h in xsk.h")

I have applied the following patch for today ... please fix this.

From: Stephen Rothwell <[email-masked]>
Date: Thu, 18 Apr 2019 11:54:56 +1000
Subject: [PATCH] suppress warning in tools/lib/bpf/libbpf_util.h

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 tools/lib/bpf/libbpf_util.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf_util.h b/tools/lib/bpf/libbpf_util.h
index 172b707e007b..a54eb2cdbdd6 100644
--- a/tools/lib/bpf/libbpf_util.h
+++ b/tools/lib/bpf/libbpf_util.h
@@ -46,7 +46,7 @@ do {				\
 # define libbpf_smp_mb() asm volatile("dmb ish" : : : "memory")
 # define libbpf_smp_rwmb() libbpf_smp_mb()
 #else
-# warning Architecture missing native barrier functions in libbpf_util.h.
+//# warning Architecture missing native barrier functions in libbpf_util.h.
 # define libbpf_smp_rmb() __sync_synchronize()
 # define libbpf_smp_wmb() __sync_synchronize()
 # define libbpf_smp_mb() __sync_synchronize()
-- 
2.20.1

-- 
Cheers,
Stephen Rothwell