linux-kernel - [PATCH] xdp: fix type of string pointer in __XDP_ACT_SYM

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Date:   Tue, 22 Oct 2019 13:59:25 +0100
From:   "Ben Dooks (Codethink)" <ben.dooks@...ethink.co.uk>
To:     linux-kernel@...ts.codethink.co.uk
Cc:     "Ben Dooks (Codethink)" <ben.dooks@...ethink.co.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] xdp: fix type of string pointer in __XDP_ACT_SYM_TAB

The table entry in __XDP_ACT_SYM_TAB for the last item is set
to { -1, 0 } where it should be { -1, NULL } as the second item
is a pointer to a string.

Fixes the following sparse warnings:

./include/trace/events/xdp.h:28:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:53:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:82:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:140:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:155:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:190:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:225:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:260:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:318:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:356:1: warning: Using plain integer as NULL pointer
./include/trace/events/xdp.h:390:1: warning: Using plain integer as NULL pointer

Signed-off-by: Ben Dooks (Codethink) <ben.dooks@...ethink.co.uk>
---
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Martin KaFai Lau <kafai@...com>
Cc: Song Liu <songliubraving@...com>
Cc: Yonghong Song <yhs@...com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: Jesper Dangaard Brouer <hawk@...nel.org>
Cc: John Fastabend <john.fastabend@...il.com>
Cc: netdev@...r.kernel.org
Cc: bpf@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 include/trace/events/xdp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h
index 8c8420230a10..c7e3c9c5bad3 100644
--- a/include/trace/events/xdp.h
+++ b/include/trace/events/xdp.h
@@ -22,7 +22,7 @@
 #define __XDP_ACT_SYM_FN(x)	\
 	{ XDP_##x, #x },
 #define __XDP_ACT_SYM_TAB	\
-	__XDP_ACT_MAP(__XDP_ACT_SYM_FN) { -1, 0 }
+	__XDP_ACT_MAP(__XDP_ACT_SYM_FN) { -1, NULL }
 __XDP_ACT_MAP(__XDP_ACT_TP_FN)
 
 TRACE_EVENT(xdp_exception,
-- 
2.23.0