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

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Date:	Tue, 31 Mar 2015 23:45:13 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Mark Einon <mark.einon@...il.com>
Cc:	x86@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	mingo@...hat.com, hpa@...or.com, stuart.r.anderson@...el.com
Subject: Re: [PATCH] x86, earlyprintk: Fix two 'defined but not used' compile
 warnings

On Tue, Mar 31, 2015 at 10:20:12PM +0100, Mark Einon 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>
> ---
>  arch/x86/kernel/early_printk.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
> index f85e3fb..6a69625 100644
> --- a/arch/x86/kernel/early_printk.c
> +++ b/arch/x86/kernel/early_printk.c
> @@ -95,6 +95,7 @@ static unsigned long early_serial_base = 0x3f8;  /* ttyS0 */
>  #define DLL             0       /*  Divisor Latch Low         */
>  #define DLH             1       /*  Divisor latch High        */
>  
> +#ifdef CONFIG_PCI
>  static void mem32_serial_out(unsigned long addr, int offset, int value)
>  {
>  	uint32_t *vaddr = (uint32_t *)addr;
> @@ -108,6 +109,7 @@ static unsigned int mem32_serial_in(unsigned long addr, int offset)
>  	/* shift implied by pointer type */
>  	return readl(vaddr + offset);
>  }
> +#endif

I'm sceptical we ever build x86 with CONFIG_PCI disabled but whatever.

Instead of adding another #ifdef CONFIG_PCI, please move those two
functions right over early_pci_serial_init() inside the #ifdef
CONFIG_PCI there.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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