linux-kernel - Re: [PATCH v2 3/3] sunrpc: Fix compilation error (`make W=1`) when dprintk() is no-op

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Message-ID: <aYN6zA79q6yOLFmA@smile.fi.intel.com>
Date: Wed, 4 Feb 2026 18:58:52 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Chuck Lever <chuck.lever@...cle.com>, NeilBrown <neil@...wn.name>,
	Jeff Layton <jlayton@...nel.org>, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	llvm@...ts.linux.dev
Cc: Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>,
	Olga Kornievskaia <okorniev@...hat.com>,
	Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH v2 3/3] sunrpc: Fix compilation error (`make W=1`) when
 dprintk() is no-op

On Wed, Feb 04, 2026 at 06:46:36PM +0200, Andy Shevchenko wrote:
> On Wed, Feb 04, 2026 at 10:41:23AM +0100, Andy Shevchenko wrote:
> > Clang compiler is not happy about set but unused variables:
> > 
> > .../flexfilelayout/flexfilelayoutdev.c:56:9: error: variable 'ret' set but not used [-Werror,-Wunused-but-set-variable]
> > .../flexfilelayout/flexfilelayout.c:1505:6: error: variable 'err' set but not used [-Werror,-Wunused-but-set-variable]
> > .../nfs4proc.c:9244:12: error: variable 'ptr' set but not used [-Werror,-Wunused-but-set-variable]
> > 
> > Fix these by forwarding parameters of dprintk() to no_printk().
> > The positive side-effect is a format-string checker enabled even for the cases
> > when dprintk() is no-op.
> 
> I'm afraid this is not end of story...
> I received a dozen of minutes ago a new report and now I'm investigating.
> 
> Patches 1 & 2 though are ready to go.

Okay, if I'm not mistaken the only leftover is the missing tk_pid field due to
conditional inclusion. However, if we do that unconditionally the data structure
won't be expanded (there is a gap of 3 bytes. (Dunno about m68k, there may be
actually +2 bytes due to 2-byte alignment.) The rest of the conditionally included
members seem not being used in dprintk().

That said, removing ifdeffery around tk_pid in struct rpc_task should fix that
problem.

If you can fold this to the patch 3, would be nice:

diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index ccba79ebf893..0dbdf3722537 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -95,10 +95,7 @@ struct rpc_task {
 	int			tk_rpc_status;	/* Result of last RPC operation */
 	unsigned short		tk_flags;	/* misc flags */
 	unsigned short		tk_timeouts;	/* maj timeouts */
-
-#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
 	unsigned short		tk_pid;		/* debugging aid */
-#endif
 	unsigned char		tk_priority : 2,/* Task priority */
 				tk_garb_retry : 2,
 				tk_cred_retry : 2;

Otherwise I can send a new version.

-- 
With Best Regards,
Andy Shevchenko