On Tue, Jan 24, 2012 at 04:00:44PM +0000, Will Deacon wrote:
> Hi Russell,
>
> On Fri, Jan 20, 2012 at 09:29:30AM +0000, Russell King - ARM Linux wrote:
> > Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
> > ---
> > arch/arm/mach-realview/core.h | 20 ++++-----------
> > arch/arm/mach-realview/realview_eb.c | 38 +++++++++++++++---------------
> > arch/arm/mach-realview/realview_pb1176.c | 38 +++++++++++++++---------------
> > arch/arm/mach-realview/realview_pb11mp.c | 38 +++++++++++++++---------------
> > arch/arm/mach-realview/realview_pba8.c | 38 +++++++++++++++---------------
> > arch/arm/mach-realview/realview_pbx.c | 38 +++++++++++++++---------------
> > 6 files changed, 100 insertions(+), 110 deletions(-)
>
> After applying this patch, I get compile-time errors in realview_*.c.
> E.g.:
>
> arch/arm/mach-realview/realview_pb1176.c:158:1: error: ‘AACI’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:159:1: error: ‘MMCI0’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:160:1: error: ‘KMI0’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:161:1: error: ‘KMI1’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:162:1: error: ‘PB1176_UART4’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:165:1: error: ‘PB1176_SMC’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:166:1: error: ‘SCTL’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:167:1: error: ‘PB1176_WATCHDOG’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:168:1: error: ‘PB1176_GPIO0’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:169:1: error: ‘GPIO1’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:170:1: error: ‘GPIO2’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:171:1: error: ‘PB1176_RTC’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:172:1: error: ‘SCI’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:173:1: error: ‘PB1176_UART0’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:174:1: error: ‘PB1176_UART1’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:175:1: error: ‘PB1176_UART2’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:176:1: error: ‘PB1176_UART3’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:177:1: error: ‘PB1176_SSP’ undeclared here (not in a function)
> arch/arm/mach-realview/realview_pb1176.c:178:1: error: ‘PB1176_CLCD’ undeclared here (not in a function)
>
> > diff --git a/arch/arm/mach-realview/core.h b/arch/arm/mach-realview/core.h
> > index 735b57a..b1c6097 100644
> > --- a/arch/arm/mach-realview/core.h
> > +++ b/arch/arm/mach-realview/core.h
> > @@ -28,21 +28,11 @@
> > #include <asm/setup.h>
> > #include <asm/leds.h>
> >
> > -#define AMBA_DEVICE(name,busid,base,plat) \
> > -static struct amba_device name##_device = { \
> > - .dev = { \
> > - .coherent_dma_mask = ~0, \
> > - .init_name = busid, \
> > - .platform_data = plat, \
> > - }, \
> > - .res = { \
> > - .start = REALVIEW_##base##_BASE, \
> > - .end = (REALVIEW_##base##_BASE) + SZ_4K - 1, \
> > - .flags = IORESOURCE_MEM, \
> > - },
>
> Which is because the old AMBA_DEVICE macro munges REALVIEW_ and _BASE
> around the peripheral identifier...
>
> > +#define APB_DEVICE(name, busid, base, plat) \
> > +static AMBA_APB_DEVICE(name, busid, 0, base, base##_IRQ, plat)
> > +
> > +#define AHB_DEVICE(name, busid, base, plat) \
> > +static AMBA_AHB_DEVICE(name, busid, 0, base, base##_IRQ, plat)
>
> ...whereas the new macros just use base directly.
>
> Fixing the macro solves the build problem:
>
>
> diff --git a/arch/arm/mach-realview/core.h b/arch/arm/mach-realview/core.h
> index b1c6097..f8f2c0a 100644
> --- a/arch/arm/mach-realview/core.h
> +++ b/arch/arm/mach-realview/core.h
> @@ -29,10 +29,10 @@
> #include <asm/leds.h>
>
> #define APB_DEVICE(name, busid, base, plat) \
> -static AMBA_APB_DEVICE(name, busid, 0, base, base##_IRQ, plat)
> +static AMBA_APB_DEVICE(name, busid, 0, REALVIEW_##base##_BASE, base##_IRQ, plat)
>
> #define AHB_DEVICE(name, busid, base, plat) \
> -static AMBA_AHB_DEVICE(name, busid, 0, base, base##_IRQ, plat)
> +static AMBA_AHB_DEVICE(name, busid, 0, REALVIEW_##base##_BASE, base##_IRQ, plat)
>
> struct machine_desc;
>
>
> but then I see a warning during boot:
>
> [ 1.669654] ------------[ cut here ]------------
> [ 1.684021] WARNING: at drivers/amba/bus.c:514 amba_device_add+0x1b4/0x1d0()
> [ 1.705585] Modules linked in:
> [ 1.715195] [<c0013a00>] (unwind_backtrace+0x0/0xfc) from [<c03d1350>] (dump_stack+0x20/0x24)
> [ 1.741288] [<c03d1350>] (dump_stack+0x20/0x24) from [<c001f9b8>] (warn_slowpath_common+0x5c/0x74)
> [ 1.768689] [<c001f9b8>] (warn_slowpath_common+0x5c/0x74) from [<c001f9fc>] (warn_slowpath_null+0x2c/0x34)
> [ 1.798165] [<c001f9fc>] (warn_slowpath_null+0x2c/0x34) from [<c023dcd4>] (amba_device_add+0x1b4/0x1d0)
> [ 1.826857] [<c023dcd4>] (amba_device_add+0x1b4/0x1d0) from [<c023dd84>] (amba_device_register+0x94/0xc4)
> [ 1.856106] [<c023dd84>] (amba_device_register+0x94/0xc4) from [<c0551934>] (realview_pb1176_init+0x74/0xac)
> [ 1.886120] [<c0551934>] (realview_pb1176_init+0x74/0xac) from [<c054d60c>] (customize_machine+0x24/0x30)
> [ 1.915340] [<c054d60c>] (customize_machine+0x24/0x30) from [<c000879c>] (do_one_initcall+0x48/0x1a0)
> [ 1.943505] [<c000879c>] (do_one_initcall+0x48/0x1a0) from [<c054b870>] (kernel_init+0x80/0x128)
> [ 1.970378] [<c054b870>] (kernel_init+0x80/0x128) from [<c000ea78>] (kernel_thread_exit+0x0/0x8)
> [ 1.997192] ---[ end trace 1b75b31a2719ed1e ]---
>
> I suspect that comes from PB1176_GPIO0_IRQ being -1.
It seems you've also tested the code which detects -1 IRQs too, which
is good. PB1176 needs that GPIO0_IRQ fixing, but I suspect passing
zero may not be entirely a good thing for it as request_irq(0,...)
probably succeeds there. I think that needs fixing before this warning
can go away.
In the mean time, it's just a warning, and its saying there's something
wrong there which needs fixing but without anything currently broken.
So it's working as designed.
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