linux-kernel - [PATCH] silence warnings when building kernel/bpf/core.c with W=1

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Message-ID: <8434.1470022053@turing-police.cc.vt.edu>
Date:	Sun, 31 Jul 2016 23:27:33 -0400
From:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
To:	Alexei Starovoitov <ast@...nel.org>
cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] silence warnings when building kernel/bpf/core.c with W=1

Building with W=1 generates some 350 lines of warnings of the form:

kernel/bpf/core.c: In function '__bpf_prog_run':
kernel/bpf/core.c:476:33: warning: initialized field overwritten [-Woverride-init]
   [BPF_ALU | BPF_ADD | BPF_X] = &&ALU_ADD_X,
                                 ^~
kernel/bpf/core.c:476:33: note: (near initialization for 'jumptable[12]')

Since they come from the way we intentionally build the table, silence
that one specific warning.

Signed-off-by: Valdis Kletnieks <valdis.kletnieks@...edu>

diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
index eed911d091da..bb915f9d9f92 100644
--- a/kernel/bpf/Makefile
+++ b/kernel/bpf/Makefile
@@ -1,3 +1,4 @@
+CFLAGS_core.o += -Wno-override-init
 obj-y := core.o
 
 obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o