Messages in this thread Patch in this message | | | From | Zhangjin Wu <> | Subject | [RFC PATCH 1/5] syscall: Allow configure used system calls | Date | Fri, 17 Feb 2023 08:49:21 +0800 |
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A new CONFIG_SYSCALLS_USED is added to configure the system calls used in a target system (especially for the ultra small embedded systems), the other system calls will be disabled.
If further enabling CONFIG_HAVE_LD_DEAD_CODE_DATA_ELIMINATION, the other ones (if also not used by kernel itself) will be removed automatically.
The used system calls should be listed one by one like this:
write exit reboot
The architecture should implement it and then select the HAVE_SYSCALLS_USED option.
Signed-off-by: Zhangjin Wu <falcon@tinylab.org> --- init/Kconfig | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/init/Kconfig b/init/Kconfig index 44e90b28a30f..2c4b8b234168 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1502,6 +1502,10 @@ config BPF bool select CRYPTO_LIB_SHA1 +config HAVE_SYSCALLS_USED + bool + default n + menuconfig EXPERT bool "Configure standard kernel features (expert users)" # Unhide debug options, to make the on-by-default options visible @@ -1728,6 +1732,24 @@ config MEMBARRIER If unsure, say Y. +config SYSCALLS_USED + string "Configure used syscalls (EXPERIMENTAL)" if EXPERT + depends on HAVE_SYSCALLS_USED + default "" + help + This option allows to configure the system calls used in a target + system, the other system calls will be disabled. + + If further enabling CONFIG_HAVE_LD_DEAD_CODE_DATA_ELIMINATION, the + other ones (if also not used by kernel itself) will be removed + automatically. + + The used system calls should be listed one by one like this: + + write exit reboot + + If unsure, keep this empty. + config KALLSYMS bool "Load all symbols for debugging/ksymoops" if EXPERT default y -- 2.25.1
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