[PATCH] lib: compile memcat_p only when needed

Reducing the kernel size by about 4k by compiling it
conditionally, only when needed.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
---
 drivers/hwtracing/stm/Kconfig | 1 +
 lib/Kconfig                   | 3 +++
 lib/Kconfig.debug             | 1 +
 lib/Makefile                  | 4 +++-
 4 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig
index aad594fe79cc..8ce5cfd759d1 100644
--- a/drivers/hwtracing/stm/Kconfig
+++ b/drivers/hwtracing/stm/Kconfig

@@ -3,6 +3,7 @@ config STM
        tristate "System Trace Module devices"
        select CONFIGFS_FS
        select SRCU
+       select GENERIC_LIB_MEMCAT_P
        help
          A System Trace Module (STM) is a device exporting data in System
          Trace Protocol (STP) format as defined by MIPI STP standards.

diff --git a/lib/Kconfig b/lib/Kconfig
index b46a9fd122c8..b42ed8d68937 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig

@@ -686,6 +686,9 @@ config GENERIC_LIB_CMPDI2
 config GENERIC_LIB_UCMPDI2
        bool

+config GENERIC_LIB_MEMCAT_P
+       tristate
+
 config PLDMFW
        bool
        default n

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c789b39ed527..beb5adb2f0b7 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug

@@ -2334,6 +2334,7 @@ config TEST_DEBUG_VIRTUAL

 config TEST_MEMCAT_P
        tristate "Test memcat_p() helper function"
+       select GENERIC_LIB_MEMCAT_P
        help
          Test the memcat_p() helper for correctly merging two
          pointer arrays together.

diff --git a/lib/Makefile b/lib/Makefile
index ce45af50983a..18fd6630be0b 100644
--- a/lib/Makefile
+++ b/lib/Makefile

@@ -36,7 +36,9 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
         flex_proportions.o ratelimit.o show_mem.o \
         is_single_threaded.o plist.o decompress.o kobject_uevent.o \
         earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
-        nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o
+        nmi_backtrace.o nodemask.o win_minmax.o
+
+obj-$(CONFIG_GENERIC_LIB_MEMCAT_P) += memcat_p.o

 lib-$(CONFIG_PRINTK) += dump_stack.o
 lib-$(CONFIG_SMP) += cpumask.o
--

2.11.0

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