linux-kernel - Re: linux-next: build warnings from Linus' tree

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Date:   Sun, 19 Aug 2018 22:53:56 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Adam Borowski <kilobyte@...band.pl>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-next <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build warnings from Linus' tree

On Mon, Aug 20, 2018 at 03:33:19AM +0200, Adam Borowski wrote:
> Valid uses of strncpy() do exist (such as SCSI structs), but those deal with
> fixed-width fields.  Thus, gcc is right for warning for at least some of
> misuse of strncpy() for C strings.  The function wasn't designed for them.

The problem is that the kernel has a goodly share of fixed-width
fields.  The ext4 superblock is one of them.  strncpy() is the most
convenient function to do what is needed.  If it's a valid use, then
we need to have a way to get gcc to shut up about them.

	   	   	      	 - Ted