Introduce CONFIG_CHECK_SIGNATURE

Introduce CONFIG_CHECK_SIGNATURE to control inclusion of check_signature()
and avoid problems on platforms that don't have readb().

Let the few legacy (ISA || PCI || X86) drivers that need check_signature()
select CONFIG_CHECK_SIGNATURE.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 13 insertions, 1 deletions

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index ef32e977d307..4245b7f80a49 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -68,6 +68,7 @@ config AMIGA_Z2RAM
 config BLK_DEV_XD
         tristate "XT hard disk support"
         depends on ISA && ISA_DMA_API
+        select CHECK_SIGNATURE
         help
           Very old 8 bit hard disk controllers used in the IBM XT computer
           will be supported if you say Y here.
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 9b26574f1466..d602b8fa7d46 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -68,6 +68,7 @@ config INPUT_WISTRON_BTNS
         select INPUT_POLLDEV
         select NEW_LEDS
         select LEDS_CLASS
+        select CHECK_SIGNATURE
         help
           Say Y here for support of Winstron laptop button interface, used on
           laptops of various brands, including Acer and Fujitsu-Siemens. If
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index a50b9553d5b1..6f2c71ef47ee 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -367,6 +367,7 @@ config SCSI_3W_9XXX
 config SCSI_7000FASST
         tristate "7000FASST SCSI support"
         depends on ISA && SCSI && ISA_DMA_API
+        select CHECK_SIGNATURE
         help
           This driver supports the Western Digital 7000 SCSI host adapter
           family.  Some information is in the source:
@@ -388,6 +389,7 @@ config SCSI_AHA152X
         tristate "Adaptec AHA152X/2825 support"
         depends on ISA && SCSI && !64BIT
         select SCSI_SPI_ATTRS
+        select CHECK_SIGNATURE
         ---help---
           This is a driver for the AHA-1510, AHA-1520, AHA-1522, and AHA-2825
           SCSI host adapters. It also works for the AVA-1505, but the IRQ etc.
@@ -583,6 +585,7 @@ config SCSI_DTC3280
         tristate "DTC3180/3280 SCSI support"
         depends on ISA && SCSI
         select SCSI_SPI_ATTRS
+        select CHECK_SIGNATURE
         help
           This is support for DTC 3180/3280 SCSI Host Adapters.  Please read
           the SCSI-HOWTO, available from
@@ -657,6 +660,7 @@ config SCSI_EATA_PIO
 config SCSI_FUTURE_DOMAIN
         tristate "Future Domain 16xx SCSI/AHA-2920A support"
         depends on (ISA || PCI) && SCSI
+        select CHECK_SIGNATURE
         ---help---
           This is support for Future Domain's 16-bit SCSI host adapters
           (TMC-1660/1680, TMC-1650/1670, TMC-3260, TMC-1610M/MER/MEX) and
@@ -1324,6 +1328,7 @@ config SCSI_LPFC
 config SCSI_SEAGATE
         tristate "Seagate ST-02 and Future Domain TMC-8xx SCSI support"
         depends on X86 && ISA && SCSI
+        select CHECK_SIGNATURE
         ---help---
           These are 8-bit SCSI controllers; the ST-01 is also supported by
           this driver.  It is explained in section 3.9 of the SCSI-HOWTO,
@@ -1397,6 +1402,7 @@ config SCSI_T128
         tristate "Trantor T128/T128F/T228 SCSI support"
         depends on ISA && SCSI
         select SCSI_SPI_ATTRS
+        select CHECK_SIGNATURE
         ---help---
           This is support for a SCSI host adapter. It is explained in section
           3.11 of the SCSI-HOWTO, available from
diff --git a/lib/Kconfig b/lib/Kconfig
index e5c2c514174a..ba3d104994d9 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -138,4 +138,7 @@ config HAS_DMA
         depends on !NO_DMA
         default y
 
+config CHECK_SIGNATURE
+        bool
+
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index d9e5f1cd0bfb..6b0ba8cf4e5f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,7 +21,8 @@ CFLAGS_kobject_uevent.o += -DDEBUG
 endif
 
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
-obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o check_signature.o
+obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
+obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
 obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
 lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o