Re: [PATCH] lib: compile memcat_p only when needed

From: Nick Desaulniers
Date: Tue Nov 17 2020 - 13:34:02 EST


On Tue, Nov 17, 2020 at 9:38 AM Enrico Weigelt, metux IT consult
<info@xxxxxxxxx> wrote:
>
> The library function memcat_p() is currently used only once.
> (drivers/hwtracing/stm). So, often completely unused.

Any harm in just moving the definition into drivers/hwtracing/stm?
Then we don't need any Kconfig additions. There never were many users
of this function, and there probably never will be.

>
> Reducing the kernel size by about 4k by compiling it
> conditionally, only when needed.
>
> Signed-off-by: Enrico Weigelt, metux IT consult <info@xxxxxxxxx>
> ---
> 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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--
Thanks,
~Nick Desaulniers