[PATCH] Make number of IDE interfaces configurable

Make IDE_HWIFS configurable if EMBEDDED

This lets us lop as much as 16k off an x86 build.  It's a little ugly, but
it's dead simple.  Note the fix for HWIFS < 2.

Sizing interfaces dynamically unfortunately turns out to be pretty
major surgery.

add/remove: 0/1 grow/shrink: 0/11 up/down: 0/-16182 (-16182)
function                                     old     new   delta
ide_hwifs                                  16920    1692  -15228
init_irq                                    1113     750    -363
ideprobe_init                                283     138    -145
ide_pci_setup_ports                         1329    1193    -136
save_match                                    85       -     -85
ide_register_hw_with_fixup                   367     287     -80
ide_setup                                   1364    1308     -56
is_chipset_set                                40       4     -36
create_proc_ide_interfaces                   225     205     -20
init_ide_data                                 84      67     -17
ide_probe_for_cmd640x                       1198    1183     -15
ide_unregister                              1452    1451      -1
Signed-off-by: NMatt Mackall <mpm@selenic.com>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Acked-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/ide/Kconfig

@@ -56,7 +56,7 @@ if IDE
 
 config IDE_MAX_HWIFS
 	int "Max IDE interfaces"
-	depends on ALPHA || SUPERH || IA64
+	depends on ALPHA || SUPERH || IA64 || EMBEDDED
 	default 4
 	help
 	  This is the maximum number of IDE hardware interfaces that will

drivers/ide/setup-pci.c

@@ -101,7 +101,7 @@ static ide_hwif_t *ide_match_hwif(unsigned long io_base, u8 bootable, const char
 				return hwif;	/* pick an unused entry */
 		}
 	}
-	for (h = 0; h < 2; ++h) {
+	for (h = 0; h < 2 && h < MAX_HWIFS; ++h) {
 		hwif = ide_hwifs + h;
 		if (hwif->chipset == ide_unknown)
 			return hwif;	/* pick an unused entry */

include/linux/ide.h

@@ -251,7 +251,8 @@ static inline void ide_std_init_ports(hw_regs_t *hw,
 
 #include <asm/ide.h>
 
-#ifndef MAX_HWIFS
+#if !defined(MAX_HWIFS) || defined(CONFIG_EMBEDDED)
+#undef MAX_HWIFS
 #define MAX_HWIFS	CONFIG_IDE_MAX_HWIFS
 #endif