linux-kernel - Re: [PATCH net-next] lib: move strncpy_from

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Message-Id: <20150831.123628.1591879942458458246.davem@davemloft.net>
Date:	Mon, 31 Aug 2015 12:36:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	fengguang.wu@...el.com, linux@...ck-us.net, rostedt@...dmis.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] lib: move strncpy_from_unsafe() into
 mm/maccess.c

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Mon, 31 Aug 2015 08:57:10 -0700

> To fix build errors:
> kernel/built-in.o: In function `bpf_trace_printk':
> bpf_trace.c:(.text+0x11a254): undefined reference to `strncpy_from_unsafe'
> kernel/built-in.o: In function `fetch_memory_string':
> trace_kprobe.c:(.text+0x11acf8): undefined reference to `strncpy_from_unsafe'
> 
> move strncpy_from_unsafe() next to probe_kernel_read/write()
> which use the same memory access style.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Fixes: 1a6877b9c0c2 ("lib: introduce strncpy_from_unsafe()")
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> ---
> For configs without kprobes and bpf the cost of this unused function is
> ~200 bytes which I think is a better trade off vs creating
> new Kconfig selector just for this single function.
> Another alternative is to move it to kernel/trace/trace_kprobe.c,
> but then it will lose generality and probably should be removed
> from include/linux/uaccess.h, so mm/maccess.c looks the best.

Ok, applied.
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