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    Subject[patch -mm] Make check_signature() depend on CONFIG_HAS_IOMEM
    From: Heiko Carstens <heiko.carstens@de.ibm.com>

    check_signature() uses readb() and therefore should only be build on
    CONFIG_HAS_IOMEM.

    Otherwise breaks s390:
    lib/check_signature.c: In function `check_signature':
    lib/check_signature.c:19: error: implicit declaration of function `readb'

    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
    ---
    lib/Makefile | 5 ++---
    1 files changed, 2 insertions(+), 3 deletions(-)

    Index: linux-2.6.22-rc6-mm1/lib/Makefile
    ===================================================================
    --- linux-2.6.22-rc6-mm1.orig/lib/Makefile
    +++ linux-2.6.22-rc6-mm1/lib/Makefile
    @@ -5,8 +5,7 @@
    lib-y := ctype.o string.o vsprintf.o cmdline.o \
    rbtree.o radix-tree.o dump_stack.o \
    idr.o int_sqrt.o bitmap.o extable.o prio_tree.o \
    - sha1.o irq_regs.o reciprocal_div.o argv_split.o \
    - check_signature.o
    + sha1.o irq_regs.o reciprocal_div.o argv_split.o

    lib-$(CONFIG_MMU) += ioremap.o pagewalk.o
    lib-$(CONFIG_SMP) += cpumask.o
    @@ -22,7 +21,7 @@ CFLAGS_kobject_uevent.o += -DDEBUG
    endif

    obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
    -obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
    +obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o check_signature.o
    obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
    obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
    lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
    -
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