linux-kernel - Re: [PATCH] locking/rwsem: Move is_rwsem_reader_owned() and rwsem_owner() under CONFIG_DEBUG

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Message-ID: <ZuAAbi7hRWz2DUte@smile.fi.intel.com>
Date: Tue, 10 Sep 2024 11:16:46 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Waiman Long <longman@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>
Subject: Re: [PATCH] locking/rwsem: Move is_rwsem_reader_owned() and
 rwsem_owner() under CONFIG_DEBUG_RWSEMS

On Tue, Sep 10, 2024 at 11:15:54AM +0300, Andy Shevchenko wrote:
> On Mon, Sep 09, 2024 at 02:29:05PM -0400, Waiman Long wrote:
> > Both is_rwsem_reader_owned() and rwsem_owner() are currently only used when
> > CONFIG_DEBUG_RWSEMS is defined. This causes a compilation error with clang
> > when `make W=1` and CONFIG_WERROR=y:
> > 
> > kernel/locking/rwsem.c:187:20: error: unused function 'is_rwsem_reader_owned' [-Werror,-Wunused-function]
> >   187 | static inline bool is_rwsem_reader_owned(struct rw_semaphore *sem)
> >       |                    ^~~~~~~~~~~~~~~~~~~~~
> > kernel/locking/rwsem.c:271:35: error: unused function 'rwsem_owner' [-Werror,-Wunused-function]
> >   271 | static inline struct task_struct *rwsem_owner(struct rw_semaphore *sem)
> >       |                                   ^~~~~~~~~~~
> > 
> > Fix this by moving these two functions under the CONFIG_DEBUG_RWSEMS define.
> 
> At least this solves my issue,
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

...and

Tested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

-- 
With Best Regards,
Andy Shevchenko