[PATCH v2] [POWERPC] Fix build errors when BLOCK=n

These are the symptom error messages:

  CC      arch/powerpc/kernel/setup_32.o
In file included from include/linux/blkdev.h:17,
                 from include/linux/ide.h:13,
                 from arch/powerpc/kernel/setup_32.c:13:
include/linux/bsg.h:67: warning: 'struct request_queue' declared inside parameter list
include/linux/bsg.h:67: warning: its scope is only this definition or declaration, which is probably not what you want
include/linux/bsg.h:71: warning: 'struct request_queue' declared inside parameter list
In file included from arch/powerpc/kernel/setup_32.c:13:
include/linux/ide.h:857: error: field 'wrq' has incomplete type

  CC      arch/powerpc/kernel/ppc_ksyms.o
In file included from include/linux/blkdev.h:17,
                 from include/linux/ide.h:13,
                 from arch/powerpc/kernel/ppc_ksyms.c:15:
include/linux/bsg.h:67: warning: 'struct request_queue' declared inside parameter list
include/linux/bsg.h:67: warning: its scope is only this definition or declaration, which is probably not what you want
include/linux/bsg.h:71: warning: 'struct request_queue' declared inside parameter list
In file included from arch/powerpc/kernel/ppc_ksyms.c:15:
include/linux/ide.h:857: error: field 'wrq' has incomplete type

The fix tries to use the smallest scope CONFIG_* symbols that will fix the build
problem. In this case <linux/ide.h> needs to be included only if IDE=y or
IDE=m were selected. Also, ppc_ide_md is needed only if BLK_DEV_IDE=y or
BLK_DEV_IDE=m

Moved the EXPORT_SYMBOL(ppc_ide_md) from ppc_ksysms.c next to its declaration
in setup_32.c

Signed-off-by: Emil Medve <redacted>
---

I tested that the code builds with this patch in various combinations of
configuration options: all the combinations involving BLOCK, IDE and BLK_DEV_IDE
 
A patch for the warnings above has been already commited here: http://git.kernel.org/?p=linux/kernel/git/jejb/scsi-misc-2.6.git;a=commitdiff;h=49892223f7d3a2333ef9e6cbdd526676e1fc517a

This a patch against Paul's tree (75cdff9242c4e048cb830d359920719d29b9ee7c)

powerpc> scripts/checkpatch.pl 0001-POWERPC-Fix-build-errors-when-BLOCK-n.patch
Your patch has no obvious style problems and is ready for submission.

 arch/powerpc/kernel/ppc_ksyms.c |    7 +++----
 arch/powerpc/kernel/setup_32.c  |    5 +++++
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 430c502..f00cba3 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c

@@ -12,12 +12,15 @@
 #include <linux/irq.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
+#if defined(CONFIG_IDE) || defined(CONFIG_IDE_MODULE)
 #include <linux/ide.h>
+#endif
 #include <linux/bitops.h>
 
 #include <asm/page.h>
 #include <asm/semaphore.h>
 #include <asm/processor.h>
+#include <asm/cacheflush.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/atomic.h>

@@ -95,10 +98,6 @@ EXPORT_SYMBOL(__strnlen_user);
 EXPORT_SYMBOL(copy_4K_page);
 #endif
 
-#if defined(CONFIG_PPC32) && (defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE))
-EXPORT_SYMBOL(ppc_ide_md);
-#endif
-
 #if defined(CONFIG_PCI) && defined(CONFIG_PPC32)
 EXPORT_SYMBOL(isa_io_base);
 EXPORT_SYMBOL(isa_mem_base);

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index a288a5f..7474502 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c

@@ -10,7 +10,9 @@
 #include <linux/reboot.h>
 #include <linux/delay.h>
 #include <linux/initrd.h>
+#if defined(CONFIG_IDE) || defined(CONFIG_IDE_MODULE)
 #include <linux/ide.h>
+#endif
 #include <linux/tty.h>
 #include <linux/bootmem.h>
 #include <linux/seq_file.h>

@@ -49,7 +51,10 @@
 
 extern void bootx_init(unsigned long r4, unsigned long phys);
 
+#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 struct ide_machdep_calls ppc_ide_md;
+EXPORT_SYMBOL(ppc_ide_md);
+#endif
 
 int boot_cpuid;
 EXPORT_SYMBOL_GPL(boot_cpuid);

-- 
1.5.3.GIT

On Wednesday 19 September 2007, Emil Medve wrote:

These are the symptom error messages:

  CC      arch/powerpc/kernel/setup_32.o
In file included from include/linux/blkdev.h:17,
                 from include/linux/ide.h:13,
                 from arch/powerpc/kernel/setup_32.c:13:
include/linux/bsg.h:67: warning: 'struct request_queue' declared inside parameter list
include/linux/bsg.h:67: warning: its scope is only this definition or declaration, which is probably not what you want
include/linux/bsg.h:71: warning: 'struct request_queue' declared inside parameter list
In file included from arch/powerpc/kernel/setup_32.c:13:
include/linux/ide.h:857: error: field 'wrq' has incomplete type

  CC      arch/powerpc/kernel/ppc_ksyms.o
In file included from include/linux/blkdev.h:17,
                 from include/linux/ide.h:13,
                 from arch/powerpc/kernel/ppc_ksyms.c:15:
include/linux/bsg.h:67: warning: 'struct request_queue' declared inside parameter list
include/linux/bsg.h:67: warning: its scope is only this definition or declaration, which is probably not what you want
include/linux/bsg.h:71: warning: 'struct request_queue' declared inside parameter list
In file included from arch/powerpc/kernel/ppc_ksyms.c:15:
include/linux/ide.h:857: error: field 'wrq' has incomplete type

The fix tries to use the smallest scope CONFIG_* symbols that will fix the build
problem. In this case <linux/ide.h> needs to be included only if IDE=y or
IDE=m were selected. Also, ppc_ide_md is needed only if BLK_DEV_IDE=y or
BLK_DEV_IDE=m

Moved the EXPORT_SYMBOL(ppc_ide_md) from ppc_ksysms.c next to its declaration
in setup_32.c

Signed-off-by: Emil Medve <redacted>

looks OK for me

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

Emil Medve writes:

Why are we still including linux/ide.h at all here?

 #include <linux/bitops.h>
 
 #include <asm/page.h>
 #include <asm/semaphore.h>
 #include <asm/processor.h>
+#include <asm/cacheflush.h>

What's the point of adding this?

Paul.