[PATCH] Kconfig fix (BLK_DEV_FD dependencies)

Sanitized and fixed floppy dependencies: split the messy dependencies for
BLK_DEV_FD by introducing a new symbol (ARCH_MAY_HAVE_PC_FDC), making
BLK_DEV_FD depend on that one and taking declarations of ARCH_MAY_HAVE_PC_FDC
to arch/*/Kconfig.  While we are at it, fixed several obvious cases when
BLK_DEV_FD should have been excluded (architectures lacking asm/floppy.h
are *not* going to have floppy.c compile, let alone work).

If you can come up with better name for that ("this architecture might
have working PC-compatible floppy disk controller"), you are more than
welcome - just s/ARCH_MAY_HAVE_PC_FDC/your_prefered_name/g in the patch
below...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 68dfdba..0f2899b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -64,6 +64,9 @@
 config GENERIC_BUST_SPINLOCK
 	bool
 
+config ARCH_MAY_HAVE_PC_FDC
+	bool
+
 config GENERIC_ISA_DMA
 	bool
 
@@ -150,6 +153,7 @@
 	select ARCH_ACORN
 	select FIQ
 	select TIMER_ACORN
+	select ARCH_MAY_HAVE_PC_FDC
 	help
 	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
 	  CD-ROM interface, serial and parallel port, and the floppy drive.