Re: [PATCH] tpm: aovid -Wunused-but-set-variable

[Jarkko Sakkinen <jarkko@kernel.org>]

On Mon, Apr 13, 2026 at 01:32:48AM +0200, Thorsten Blum wrote:
> On Fri, Mar 22, 2024 at 02:22:48PM +0100, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> > 
> > Outside of the EFI tpm code, the TPM_MEMREMAP()/TPM_MEMUNMAP functions are
> > defined as trivial macros, leading to the mapping_size variable ending
> > up unused:
> > 
> > In file included from drivers/char/tpm/tpm-sysfs.c:16:
> > In file included from drivers/char/tpm/tpm.h:28:
> > include/linux/tpm_eventlog.h:167:6: error: variable 'mapping_size' set but not used [-Werror,-Wunused-but-set-variable]
> >   167 |         int mapping_size;
> > 
> > Turn the stubs into inline functions to avoid this warning.
> > 
> > Fixes: c46f3405692d ("tpm: Reserve the TPM final events table")
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> > ---
> >  include/linux/tpm_eventlog.h | 9 +++++++--
> >  1 file changed, 7 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
> > index 7d68a5cc5881..6e5be15029fb 100644
> > --- a/include/linux/tpm_eventlog.h
> > +++ b/include/linux/tpm_eventlog.h
> > @@ -131,11 +131,16 @@ struct tcg_algorithm_info {
> >  };
> >  
> >  #ifndef TPM_MEMREMAP
> > -#define TPM_MEMREMAP(start, size) NULL
> > +static inline void *TPM_MEMREMAP(unsigned long start, size_t size)
> > +{
> > +	return NULL;
> > +}
> >  #endif
> >  
> >  #ifndef TPM_MEMUNMAP
> > -#define TPM_MEMUNMAP(start, size) do{} while(0)
> > +static inline void TPM_MEMUNMAP(void *mapping, size_t size)
> > +{
> > +}
> >  #endif
> >  
> >  /**
> 
> I just stumbled upon the same problem and found this patch from 2024,
> which still applies. I cc'ed the current maintainers - maybe someone can
> pick this up? Thanks!
> 
> Reviewed-by: Thorsten Blum <thorsten.blum@linux.dev>

Thanks.

Arnd, I fixed typo in short summary and applied with that modification.

BR, Jarkko