From: Jeffrin Jose <jeffrin@rajagiritech.edu.in>
To: davem@davemloft.net, willemb@google.com,
xiyou.wangcong@gmail.com, fw@strlen.de,
jakub.kicinski@netronome.com, john.hurley@netronome.com,
pabeni@redhat.com, brouer@redhat.com, bigeasy@linutronix.de,
jonathan.lemon@gmail.com, edumazet@google.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: objtool: skb_push.cold()+0x15: unreachable instruction
Date: Sun, 10 Nov 2019 04:35:20 +0530 [thread overview]
Message-ID: <20191109230520.GA22258@debian> (raw)
hello,
i got a warning during kernel compilation.
net/core/skbuff.o: warning: objtool: skb_push.cold()+0x15: unreachable instruction
related clips...
--------------------x----------------x---------------------
(gdb) l skb_push.cold
1880 void *skb_push(struct sk_buff *skb, unsigned int len)
1881 {
1882 skb->data -= len;
1883 skb->len += len;
1884 if (unlikely(skb->data < skb->head))
1885 skb_under_panic(skb, len, __builtin_return_address(0));
1886 return skb->data;
1887 }
1888 EXPORT_SYMBOL(skb_push);
1889
(gdb) l *0xffffffff815ffc8e
0xffffffff815ffc8e is in skb_push (net/core/skbuff.c:1885).
1880 void *skb_push(struct sk_buff *skb, unsigned int len)
1881 {
1882 skb->data -= len;
1883 skb->len += len;
1884 if (unlikely(skb->data < skb->head))
1885 skb_under_panic(skb, len, __builtin_return_address(0));
1886 return skb->data;
1887 }
1888 EXPORT_SYMBOL(skb_push);
1889
(gdb)
------------------x-----------------------x------------------------------------
$uname -a
Linux debian 5.4.0-rc1+ #1 SMP Sat Nov 9 21:29:48 IST 2019 x86_64 GNU/Linux
$
this kernel is from linux-kselftest tree
---------------------------x-------------x------------------------------
$gcc --version
gcc (Debian 9.2.1-14) 9.2.1 20191025
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-------------------------x-------------------x-----------------------------
Linux debian 5.4.0-rc1+ #1 SMP Sat Nov 9 21:29:48 IST 2019 x86_64 GNU/Linux
GNU Make 4.2.1
Binutils 2.33.1
Util-linux 2.33.1
Mount 2.33.1
Linux C Library 2.29
Dynamic linker (ldd) 2.29
Procps 3.3.15
Kbd 2.0.4
Console-tools 2.0.4
Sh-utils 8.30
Udev 241
-------------------------------x-----------------x----------------------------
--
software engineer
rajagiri school of engineering and technology
reply other threads:[~2019-11-09 23:05 UTC|newest]
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