linux-kernel - Re: [PATCH] clkdev: report over-sized strings when creating clkdev entries

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Message-ID: <ZjN0NkYifXY0OsZt@shell.armlinux.org.uk>
Date: Thu, 2 May 2024 12:08:38 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Stephen Boyd <sboyd@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
	Duanqiang Wen <duanqiangwen@...-swift.com>, mturquette@...libre.com,
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clkdev: report over-sized strings when creating clkdev
 entries

On Thu, May 02, 2024 at 09:22:39AM +0100, Russell King (Oracle) wrote:
> On Thu, May 02, 2024 at 09:02:16AM +0100, Russell King (Oracle) wrote:
> > On Wed, May 01, 2024 at 06:02:54PM -0700, Stephen Boyd wrote:
> > > Quoting Stephen Boyd (2024-05-01 17:59:16)
> > > > Quoting Russell King (Oracle) (2024-03-15 04:47:55)
> > > > > Report an error when an attempt to register a clkdev entry results in a
> > > > > truncated string so the problem can be easily spotted.
> > > > > 
> > > > > Reported by: Duanqiang Wen <duanqiangwen@...-swift.com>
> > > > > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > > > > ---
> > > > 
> > > > Applied to clk-next
> > > > 
> > > 
> > > And backed out because I get a compilation failure
> > > 
> > > drivers/clk/clkdev.c: In function 'vclkdev_alloc':
> > > drivers/clk/clkdev.c:182:17: error: function 'vclkdev_alloc' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]
> > >   182 |                 res = vsnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
> > >       |                 ^~~
> > > cc1: all warnings being treated as errors
> > > make[5]: *** [scripts/Makefile.build:244: drivers/clk/clkdev.o] Error 1
> > > make[4]: *** [scripts/Makefile.build:485: drivers/clk] Error 2
> > 
> > It builds fine for me. I don't get this _error_, and it's really no
> > different from what it originally was - instead of using vcsnprintf()
> > we're now using vsnprintf(). That should make no difference what so
> > ever.
> 
> ... and I've just checked, and it builds entirely cleanly for me.
> 
> I'll merge it.

It should be in tonight's linux-next tree.

I also note... the kernel build bot never flagged the above, not even
a warning for it, and it would've built the patch as it was Cc'd to
linux-kernel. So my conclusion is the error you are seeing is somehow
specific to your environment. Maybe you're building with an additional
set of warning flags and -Werror?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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