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Date:   Mon, 16 Nov 2020 21:33:55 +0100
From:   Samuel Thibault <samuel.thibault@ens-lyon.org>
To:     Ben Hutchings <ben@decadent.org.uk>
Cc:     linux-kernel@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: drivers/accessibility/speakup/serialio.c:48:19: warning:
 variable 'quot' set but not used
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Mail-Followup-To: Samuel Thibault <samuel.thibault@ens-lyon.org>,
        Ben Hutchings <ben@decadent.org.uk>, linux-kernel@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ben Hutchings, le lun. 16 nov. 2020 19:51:23 +0000, a ecrit:
> On Mon, 2020-11-16 at 20:01 +0100, Samuel Thibault wrote:
> > Perhaps we should rather use
> > 
> > depends on ISA || (X86 && COMPILE_TEST)
> > 
> > ?
> > so that we have compile testing on x86 only (where the inb/outb macros
> > always behave fine) to avoid such issues on other archs?
> 
> That seems reasonable though unusual.
> 
> > Or we tell the architecture maintainers to fix their out macros into
> > consuming their parameters?
> [...]
> 
> It does seem odd for parisc to define the I/O functions this way.  I
> don't know if it's really a bug.

Sorry I wasn't clear: the problem here is when CONFIG_EISA is disabled,
the eisa_in/out calls are replaced by BUG() stubs, and the stubs do not
consume their input:

arch/parisc/include/asm/io.h

#if defined(CONFIG_PCI)
extern void outb(unsigned char b, int addr);
#elif defined(CONFIG_EISA)
#define outb eisa_out8
#else
#define outb(x, y)	BUG()
#endif

Samuel