linux-kernel - Re: compile time warnings

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Date:	Thu, 1 Jan 2009 23:52:03 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Ingo Brueckl <ib@...peronline.de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: compile time warnings

On Thu, 1 Jan 2009, Ingo Brueckl wrote:

> Maybe somebody noticed already, with kernel 2.6.28 and gcc 4.3.2 there are a
> few compile time warnings:
> 
I've looked at these with the kernel from git as of today. I've only read 
the code, not build it.

>   arch/x86/kernel/setup.c:742: warning: 'dmi_low_memory_corruption' defined but not used
> 
I see dmi_low_memory_corruption() as well as usage of it both inside 
#ifdef CONFIG_X86_RESERVE_LOW_64K - looks fine to me:

#ifdef CONFIG_X86_RESERVE_LOW_64K
static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
{
...
static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
#ifdef CONFIG_X86_RESERVE_LOW_64K
        {
                .callback = dmi_low_memory_corruption,
...


>   arch/x86/mm/init_32.c: In function 'pagetable_init':
>   arch/x86/mm/init_32.c:515: warning: unused variable 'pgd_base'
> 

I see this : 

static void __init pagetable_init(void)
{
        pgd_t *pgd_base = swapper_pg_dir;

        permanent_kmaps_init(pgd_base);
}

pgd_base is very much used...

>   drivers/acpi/tables/tbfadt.c: In function 'acpi_tb_create_local_fadt':
>   /usr/src/linux/arch/x86/include/asm/string_32.h:75: warning: array subscript is above array bounds
> 
>   drivers/usb/core/hcd.c: In function 'usb_hcd_poll_rh_status':
>   /usr/src/linux/arch/x86/include/asm/string_32.h:75: warning: array subscript is above array bounds
> 
Not sure about these.

-- 
Jesper Juhl <jj@...osbits.net>
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