linux-kernel - Re: [PATCH v2] x86, earlyprintk: Fix two 'defined but not used' compile warnings

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Date:	Wed, 1 Apr 2015 09:05:52 +0100
From:	Mark Einon <mark@...on.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Mark Einon <mark.einon@...il.com>, x86@...nel.org,
	tglx@...utronix.de, bp@...en8.de, linux-kernel@...r.kernel.org,
	mingo@...hat.com, hpa@...or.com, stuart.r.anderson@...el.com
Subject: Re: [PATCH v2] x86, earlyprintk: Fix two 'defined but not used'
 compile warnings

On Wed, Apr 01, 2015 at 09:54:10AM +0200, Ingo Molnar wrote:
> 
> * Mark Einon <mark.einon@...il.com> wrote:
> 
> > Two static functions are only used if CONFIG_PCI is defined,so only build them
> > if this is the case. Fixes the build warnings:
> > 
> > arch/x86/kernel/early_printk.c:98:13: warning: ‘mem32_serial_out’ defined but not used [-Wunused-function]
> >  static void mem32_serial_out(unsigned long addr, int offset, int value)
> >              ^
> > arch/x86/kernel/early_printk.c:105:21: warning: ‘mem32_serial_in’ defined but not used [-Wunused-function]
> >  static unsigned int mem32_serial_in(unsigned long addr, int offset)
> >                      ^
> > 
> > Signed-off-by: Mark Einon <mark.einon@...il.com>
> > ---
> > v2 - Move code to another #ifdef instead of creating a new ifdef pair after
> > comment by Borislav Petkov <bp@...en8.de>.
> > 
> > 
> >  arch/x86/kernel/early_printk.c | 34 ++++++++++++++++++++--------------
> >  1 file changed, 20 insertions(+), 14 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
> > index f85e3fb..cb2bab2 100644
> > --- a/arch/x86/kernel/early_printk.c
> > +++ b/arch/x86/kernel/early_printk.c
> > @@ -95,20 +95,6 @@ static unsigned long early_serial_base = 0x3f8;  /* ttyS0 */
> >  #define DLL             0       /*  Divisor Latch Low         */
> >  #define DLH             1       /*  Divisor latch High        */
> >  
> > -static void mem32_serial_out(unsigned long addr, int offset, int value)
> > -{
> > -	uint32_t *vaddr = (uint32_t *)addr;
> > -	/* shift implied by pointer type */
> > -	writel(value, vaddr + offset);
> > -}
> > -
> > -static unsigned int mem32_serial_in(unsigned long addr, int offset)
> > -{
> > -	uint32_t *vaddr = (uint32_t *)addr;
> > -	/* shift implied by pointer type */
> > -	return readl(vaddr + offset);
> > -}
> > -
> >  static unsigned int io_serial_in(unsigned long addr, int offset)
> >  {
> >  	return inb(addr + offset);
> > @@ -205,6 +191,20 @@ static __init void early_serial_init(char *s)
> >  }
> >  
> >  #ifdef CONFIG_PCI
> > +static void mem32_serial_out(unsigned long addr, int offset, int value)
> > +{
> > +	uint32_t *vaddr = (uint32_t *)addr;
> > +	/* shift implied by pointer type */
> > +	writel(value, vaddr + offset);
> > +}
> > +
> > +static unsigned int mem32_serial_in(unsigned long addr, int offset)
> > +{
> > +	uint32_t *vaddr = (uint32_t *)addr;
> > +	/* shift implied by pointer type */
> > +	return readl(vaddr + offset);
> > +}
> 
> btw., while at it, this should use 'u32'.

Sure, I can change this.

> > +
> >  /*
> >   * early_pci_serial_init()
> >   *
> > @@ -375,6 +375,12 @@ static int __init setup_early_printk(char *buf)
> >  		if (!strncmp(buf, "xen", 3))
> >  			early_console_register(&xenboot_console, keep);
> >  #endif
> > +#ifdef CONFIG_EARLY_PRINTK_INTEL_MID
> > +		if (!strncmp(buf, "hsu", 3)) {
> > +			hsu_early_console_init(buf + 3);
> > +			early_console_register(&early_hsu_console, keep);
> > +		}
> > +#endif
> >  #ifdef CONFIG_EARLY_PRINTK_EFI
> >  		if (!strncmp(buf, "efi", 3))
> >  			early_console_register(&early_efi_console, keep);
> 
> huh?

Ah, my bad - looks like I patched the wrong branch before resending. I'll do a
v3 with the other change above.

Mark
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