linux-kernel - Re: mm snapshot broken-out-2007-11-06-02-32

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Date:	Wed, 7 Nov 2007 13:29:49 +0100
From:	Jean Delvare <jdelvare@...e.de>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
	linux-kernel@...r.kernel.org, trenn@...e.de,
	mhoffman@...htlink.com, lenb@...nel.org,
	Andy Whitcroft <apw@...dowen.org>
Subject: Re: mm snapshot broken-out-2007-11-06-02-32 - ACPI functions broken

Hi Kamalesh,

Le mardi 06 novembre 2007, Kamalesh Babulal a écrit :
> Hi Andrew,
> 
> The kernel build fails, on powerpc while compiling the kernel with allyesconfig option
> 
> drivers/hwmon/w83627hf.c:1631: error: implicit declaration of function ‘acpi_check_resource_conflict’
> make[2]: *** [drivers/hwmon/w83627hf.o] Error 1
> make[1]: *** [drivers/hwmon] Error 2
> make: *** [drivers] Error 2
>   CC      fs/xfs/xfs_error.o
> drivers/hwmon/w83627hf.c:1631: error: implicit declaration of function ‘acpi_check_resource_conflict’
> make[2]: *** [drivers/hwmon/w83627hf.o] Error 1
> make[1]: *** [drivers/hwmon] Error 2
> make: *** [drivers] Error 2
> drivers/i2c/busses/i2c-ali1535.c:163: error: implicit declaration of function ‘acpi_check_region’
> make[3]: *** [drivers/i2c/busses/i2c-ali1535.o] Error 1
> make[2]: *** [drivers/i2c/busses] Error 2
> make[1]: *** [drivers/i2c] Error 2
> drivers/hwmon/dme1737.c:2231: error: implicit declaration of function ‘acpi_check_resource_conflict’
> make[2]: *** [drivers/hwmon/dme1737.o] Error 1
> make[1]: *** [drivers/hwmon] Error 2
> make: *** [drivers] Error 2

Odd. Thanks for reporting.

> The patches check-for-acpi-resource-conflicts-in-hwmon-drivers and 
> check-for-acpi-resource-conflicts-in-i2c-bus-drivers.patch, causes this build failure.
> The declaration of the functions are under ifdef CONFIG_ACPI.

There's an #else after that, and the functions are defined as inlines
doing nothing in the non-ACPI case. The code looks OK to me, but I can
reproduce the problem on x86_64 with CONFIG_ACPI=n.

Aha, I see it now, there are nested #ifdef CONFIG_ACPI in acpi.h,
so the inner one is a no-op (and its #else counterpart is never
evaluated.) That's pretty confusing, I'll send a patch fixing this.

In the meantime, here's a quick fix so that you can go on testing
the mm snapshot. Apply this at the top of the series:

Fix the <linux/acpi.h> breakage for CONFIG_ACPI=n.

Signed-off-by: Jean Delvare <jdelvare@...e.de>
---
 include/linux/acpi.h |   23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

--- linux-2.6.24-rc1.orig/include/linux/acpi.h	2007-11-07 12:45:47.000000000 +0100
+++ linux-2.6.24-rc1/include/linux/acpi.h	2007-11-07 13:23:06.000000000 +0100
@@ -26,6 +26,7 @@
 #define _LINUX_ACPI_H
 
 
+#include <linux/ioport.h>
 #ifdef	CONFIG_ACPI
 
 #ifndef _LINUX
@@ -134,17 +135,6 @@ int acpi_check_mem_region(resource_size_
 
 #define acpi_mp_config	0
 
-static inline int acpi_check_resource_conflict(struct resource *res)
-{ return 0; }
-
-static inline int acpi_check_region(resource_size_t start, resource_size_t n,
-				    const char *name)
-{ return 0; }
-
-static inline int acpi_check_mem_region(resource_size_t start,
-					resource_size_t n, const char *name)
-{ return 0; }
-
 #endif 	/* !CONFIG_ACPI */
 
 int acpi_register_gsi (u32 gsi, int triggering, int polarity);
@@ -239,5 +229,16 @@ static inline int acpi_boot_table_init(v
 	return 0;
 }
 
+static inline int acpi_check_resource_conflict(struct resource *res)
+{ return 0; }
+
+static inline int acpi_check_region(resource_size_t start, resource_size_t n,
+				    const char *name)
+{ return 0; }
+
+static inline int acpi_check_mem_region(resource_size_t start,
+					resource_size_t n, const char *name)
+{ return 0; }
+
 #endif	/* CONFIG_ACPI */
 #endif	/*_LINUX_ACPI_H*/


-- 
Jean Delvare
Suse L3
-
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