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Date: Mon, 11 May 2015 23:32:28 +0200
From: Paul Bolle <pebolle@...cali.nl>
To: Josh Triplett <josh@...htriplett.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Michal Hocko <mhocko@...e.cz>,
Vladimir Davydov <vdavydov@...allels.com>,
Johannes Weiner <hannes@...xchg.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Andy Lutomirski <luto@...capital.net>,
Bertrand Jacquin <beber@...eeweb.net>,
"Luis R. Rodriguez" <mcgrof@...e.com>,
Iulia Manda <iulia.manda21@...il.com>,
Pranith Kumar <bobby.prani@...il.com>,
Clark Williams <clark.williams@...il.com>,
Mel Gorman <mgorman@...e.de>,
Randy Dunlap <rdunlap@...radead.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/1] init/Kconfig: Split expert menu into a separate
file, init/Kconfig.expert
On Mon, 2015-05-11 at 14:18 -0700, Josh Triplett wrote:
> However, that would produce *two* entries under the "General setup"
> menu: a yes/no entry "Configure standard kernel features (expert users)"
> with no submenu, and a "Some separate menu prompt here" entry with a
> submenu but no '[ ]' for a yes/no option. Integrating the two (without
> using menuconfig's implicit "add stuff to submenu until an option's
> prompt doesn't depend on this symbol" magic) requires new a kconfig
> mechanism.
The diff pasted at the end of this message, which I quickly cobbled
together an applies on top of this 2/1, generates these two lines in
menuconfig (for EXPERT = 'y')
[*] Configure standard kernel features (expert users)
Standard kernel features --->
Is squashing those two lines worth a new kconfig mechanism?
Thanks,
Paul Bolle
diff --git a/init/Kconfig b/init/Kconfig
index 06c585007964..dfb2a7405a83 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1421,6 +1421,16 @@ config BPF_SYSCALL
Enable the bpf() system call that allows to manipulate eBPF
programs and maps via file descriptors.
+config EXPERT
+ bool "Configure standard kernel features (expert users)"
+ # Unhide debug options, to make the on-by-default options visible
+ select DEBUG_KERNEL
+ help
+ This option allows certain base kernel options and settings
+ to be disabled or tweaked. This is for specialized
+ environments which can tolerate a "non-standard" kernel.
+ Only use this if you really know what you are doing.
+
source init/Kconfig.expert
config EMBEDDED
diff --git a/init/Kconfig.expert b/init/Kconfig.expert
index c84a3720164b..c5718f1dc978 100644
--- a/init/Kconfig.expert
+++ b/init/Kconfig.expert
@@ -1,22 +1,15 @@
-menuconfig EXPERT
- bool "Configure standard kernel features (expert users)"
- # Unhide debug options, to make the on-by-default options visible
- select DEBUG_KERNEL
- help
- This option allows certain base kernel options and settings
- to be disabled or tweaked. This is for specialized
- environments which can tolerate a "non-standard" kernel.
- Only use this if you really know what you are doing.
+menu "Standard kernel features"
+ visible if EXPERT
config UID16
- bool "Enable 16-bit UID system calls" if EXPERT
+ bool "Enable 16-bit UID system calls"
depends on HAVE_UID16 && MULTIUSER
default y
help
This enables the legacy 16-bit UID syscall wrappers.
config MULTIUSER
- bool "Multiple users, groups and capabilities support" if EXPERT
+ bool "Multiple users, groups and capabilities support"
default y
help
This option enables support for non-root users, groups and
@@ -30,7 +23,7 @@ config MULTIUSER
If unsure, say Y here.
config SGETMASK_SYSCALL
- bool "sgetmask/ssetmask syscalls support" if EXPERT
+ bool "sgetmask/ssetmask syscalls support"
def_bool PARISC || MN10300 || BLACKFIN || M68K || PPC || MIPS || X86 || SPARC || CRIS || MICROBLAZE || SUPERH
---help---
sys_sgetmask and sys_ssetmask are obsolete system calls
@@ -40,7 +33,7 @@ config SGETMASK_SYSCALL
If unsure, leave the default option here.
config SYSFS_SYSCALL
- bool "Sysfs syscall support" if EXPERT
+ bool "Sysfs syscall support"
default y
---help---
sys_sysfs is an obsolete system call no longer supported in libc.
@@ -50,7 +43,7 @@ config SYSFS_SYSCALL
If unsure say Y here.
config SYSCTL_SYSCALL
- bool "Sysctl syscall support" if EXPERT
+ bool "Sysctl syscall support"
depends on PROC_SYSCTL
default n
select SYSCTL
@@ -67,7 +60,7 @@ config SYSCTL_SYSCALL
If unsure say N here.
config KALLSYMS
- bool "Load all symbols for debugging/ksymoops" if EXPERT
+ bool "Load all symbols for debugging/ksymoops"
default y
help
Say Y here to let the kernel print out symbolic crash information and
@@ -93,7 +86,7 @@ config KALLSYMS_ALL
config PRINTK
default y
- bool "Enable support for printk" if EXPERT
+ bool "Enable support for printk"
select IRQ_WORK
help
This option enables normal printk support. Removing it
@@ -103,7 +96,7 @@ config PRINTK
strongly discouraged.
config BUG
- bool "BUG() support" if EXPERT
+ bool "BUG() support"
default y
help
Disabling this option eliminates support for BUG and WARN, reducing
@@ -115,13 +108,13 @@ config BUG
config ELF_CORE
depends on COREDUMP
default y
- bool "Enable ELF core dumps" if EXPERT
+ bool "Enable ELF core dumps"
help
Enable support for generating core dumps. Disabling saves about 4k.
config PCSPKR_PLATFORM
- bool "Enable PC-Speaker support" if EXPERT
+ bool "Enable PC-Speaker support"
depends on HAVE_PCSPKR_PLATFORM
select I8253_LOCK
default y
@@ -131,14 +124,14 @@ config PCSPKR_PLATFORM
config BASE_FULL
default y
- bool "Enable full-sized data structures for core" if EXPERT
+ bool "Enable full-sized data structures for core"
help
Disabling this option reduces the size of miscellaneous core
kernel data structures. This saves memory on small machines,
but may reduce performance.
config FUTEX
- bool "Enable futex support" if EXPERT
+ bool "Enable futex support"
default y
select RT_MUTEXES
help
@@ -155,7 +148,7 @@ config HAVE_FUTEX_CMPXCHG
checks.
config EPOLL
- bool "Enable eventpoll support" if EXPERT
+ bool "Enable eventpoll support"
default y
select ANON_INODES
help
@@ -163,7 +156,7 @@ config EPOLL
support for epoll family of system calls.
config SIGNALFD
- bool "Enable signalfd() system call" if EXPERT
+ bool "Enable signalfd() system call"
select ANON_INODES
default y
help
@@ -173,7 +166,7 @@ config SIGNALFD
If unsure, say Y.
config TIMERFD
- bool "Enable timerfd() system call" if EXPERT
+ bool "Enable timerfd() system call"
select ANON_INODES
default y
help
@@ -183,7 +176,7 @@ config TIMERFD
If unsure, say Y.
config EVENTFD
- bool "Enable eventfd() system call" if EXPERT
+ bool "Enable eventfd() system call"
select ANON_INODES
default y
help
@@ -193,7 +186,7 @@ config EVENTFD
If unsure, say Y.
config SHMEM
- bool "Use full shmem filesystem" if EXPERT
+ bool "Use full shmem filesystem"
default y
depends on MMU
help
@@ -204,7 +197,7 @@ config SHMEM
which may be appropriate on small systems without swap.
config AIO
- bool "Enable AIO support" if EXPERT
+ bool "Enable AIO support"
default y
help
This option enables POSIX asynchronous I/O which may by used
@@ -212,7 +205,7 @@ config AIO
this option saves about 7k.
config ADVISE_SYSCALLS
- bool "Enable madvise/fadvise syscalls" if EXPERT
+ bool "Enable madvise/fadvise syscalls"
default y
help
This option enables the madvise and fadvise syscalls, used by
@@ -223,9 +216,11 @@ config ADVISE_SYSCALLS
config PCI_QUIRKS
default y
- bool "Enable PCI quirk workarounds" if EXPERT
+ bool "Enable PCI quirk workarounds"
depends on PCI
help
This enables workarounds for various PCI chipset
bugs/quirks. Disable this only if your target machine is
unaffected by PCI quirks.
+
+endmenu
--
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