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Date: Sun, 27 Jul 2008 16:32:16 +0200 From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com> To: Adrian Bunk <bunk@...nel.org> Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [2.6 patch] simplify MAX_HWIFS setting On Sunday 27 July 2008, Adrian Bunk wrote: > The sh systemh_defconfig currently fails to build with the following > error: > > <-- snip --> > > ... > CC arch/sh/boards/renesas/systemh/irq.o > In file included from /home/bunk/linux/kernel-2.6/git/linux-2.6/arch/sh/boards/renesas/systemh/irq.c:16: > /home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/ide.h:645: error: 'CONFIG_IDE_MAX_HWIFS' undeclared here (not in a function) > make[2]: *** [arch/sh/boards/renesas/systemh/irq.o] Error 1 Please also fix the source root of the problem: arch/sh/boards/renesas/systemh/irq.c should have no bussiness in including include/linux/ide.h (which is for drivers/ide/ _only_) > <-- snip --> > > Considering the little benefits of all this fiddling with IDE_MAX_HWIFS > I decided to fix it through a simplification: > - always #define MAX_HWIFS CONFIG_IDE_MAX_HWIFS > - always set CONFIG_IDE_MAX_HWIFS in kconfig > - let IDE_MAX_HWIFS default to 10 > - allow changing the value of IDE_MAX_HWIFS only if IDE && EMBEDDED I was actually wondering whether it is worth to keep IDE_MAX_HWIFS now that ide_hwif_t instances are allocated dynamically. [ The difference between MAX_HWIFS == 10 and MAX_HWIFS == 2 is now ~100 bytes (x86_32) and between MAX_HWIFS == 10 and MAX_HWIFS == 1 it is ~1kb (IIRC). ] Since there were also many other improvements in shrinking drivers/ide/ code size which should keep embedded users happy and compensate for the above 1kB-worst-case I would prefer to have IDE_MAX_HWIFS removed completely. > Reported-by: Adrian Bunk <bunk@...nel.org> > Signed-off-by: Adrian Bunk <bunk@...nel.org> > > --- > > drivers/ide/Kconfig | 9 ++++----- > include/linux/ide.h | 11 ----------- > 2 files changed, 4 insertions(+), 16 deletions(-) > > fd8ca9d5fefc48c04caa910adb753924454d9cfc > diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig > index 130ef64..174b627 100644 > --- a/drivers/ide/Kconfig > +++ b/drivers/ide/Kconfig > @@ -52,18 +52,17 @@ menuconfig IDE > > If unsure, say Y. > > -if IDE > - > config IDE_MAX_HWIFS > - int "Max IDE interfaces" > - depends on ALPHA || SUPERH || IA64 || EMBEDDED > + int "Max IDE interfaces" if IDE && EMBEDDED > range 1 10 > - default 4 > + default 10 > help > This is the maximum number of IDE hardware interfaces that will > be supported by the driver. Make sure it is at least as high as > the number of IDE interfaces in your system. > > +if IDE > + > config BLK_DEV_IDE > tristate "Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support" > ---help--- > diff --git a/include/linux/ide.h b/include/linux/ide.h > index b846bc4..b5b84fe 100644 > --- a/include/linux/ide.h > +++ b/include/linux/ide.h > @@ -219,18 +219,7 @@ static inline int __ide_default_irq(unsigned long base) > #include <asm-generic/ide_iops.h> > #endif > > -#ifndef MAX_HWIFS > -#if defined(CONFIG_BLACKFIN) || defined(CONFIG_H8300) || defined(CONFIG_XTENSA) > -# define MAX_HWIFS 1 > -#else > -# define MAX_HWIFS 10 > -#endif > -#endif > - > -#if !defined(MAX_HWIFS) || defined(CONFIG_EMBEDDED) > -#undef MAX_HWIFS > #define MAX_HWIFS CONFIG_IDE_MAX_HWIFS > -#endif > > /* Currently only m68k, apus and m8xx need it */ > #ifndef IDE_ARCH_ACK_INTR -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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