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Subject[PATCH 2/9] um: cleanup Kconfig files
Date
We can handle all not architecture specific UM configuration directly in
the newly added arch/um/Kconfig. Do so by merging the Kconfig.common,
Kconfig.rest and Kconfig.um files into arch/um/Kconfig, and move the main
UML menu as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/um/Kconfig | 210 +++++++++++++++++++++++++++++++++++++++++
arch/um/Kconfig.common | 60 ------------
arch/um/Kconfig.rest | 22 -----
arch/um/Kconfig.um | 124 ------------------------
arch/x86/um/Kconfig | 10 --
5 files changed, 210 insertions(+), 216 deletions(-)
delete mode 100644 arch/um/Kconfig.common
delete mode 100644 arch/um/Kconfig.rest
delete mode 100644 arch/um/Kconfig.um

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 24607af202dc..1f605a7281cc 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -1,3 +1,213 @@
# SPDX-License-Identifier: GPL-2.0

+menu "UML-specific options"
+
+config UML
+ bool
+ default y
+ select ARCH_HAS_KCOV
+ select HAVE_ARCH_AUDITSYSCALL
+ select HAVE_ARCH_SECCOMP_FILTER
+ select HAVE_UID16
+ select HAVE_FUTEX_CMPXCHG if FUTEX
+ select HAVE_DEBUG_KMEMLEAK
+ select GENERIC_IRQ_SHOW
+ select GENERIC_CPU_DEVICES
+ select GENERIC_CLOCKEVENTS
+ select HAVE_GCC_PLUGINS
+ select TTY # Needed for line.c
+
+config MMU
+ bool
+ default y
+
+config NO_IOMEM
+ def_bool y
+
+config ISA
+ bool
+
+config SBUS
+ bool
+
+config PCI
+ bool
+
+config PCMCIA
+ bool
+
+config TRACE_IRQFLAGS_SUPPORT
+ bool
+ default y
+
+config LOCKDEP_SUPPORT
+ bool
+ default y
+
+config STACKTRACE_SUPPORT
+ bool
+ default y
+ select STACKTRACE
+
+config GENERIC_CALIBRATE_DELAY
+ bool
+ default y
+
+config HZ
+ int
+ default 100
+
+config NR_CPUS
+ int
+ range 1 1
+ default 1
+
source "arch/$(SUBARCH)/um/Kconfig"
+
+config STATIC_LINK
+ bool "Force a static link"
+ default n
+ help
+ This option gives you the ability to force a static link of UML.
+ Normally, UML is linked as a shared binary. This is inconvenient for
+ use in a chroot jail. So, if you intend to run UML inside a chroot,
+ you probably want to say Y here.
+ Additionally, this option enables using higher memory spaces (up to
+ 2.75G) for UML.
+
+source "mm/Kconfig"
+
+config LD_SCRIPT_STATIC
+ bool
+ default y
+ depends on STATIC_LINK
+
+config LD_SCRIPT_DYN
+ bool
+ default y
+ depends on !LD_SCRIPT_STATIC
+ select MODULE_REL_CRCS if MODVERSIONS
+
+source "fs/Kconfig.binfmt"
+
+config HOSTFS
+ tristate "Host filesystem"
+ help
+ While the User-Mode Linux port uses its own root file system for
+ booting and normal file access, this module lets the UML user
+ access files stored on the host. It does not require any
+ network connection between the Host and UML. An example use of
+ this might be:
+
+ mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
+
+ where /tmp/fromhost is an empty directory inside UML and
+ /tmp/umlshare is a directory on the host with files the UML user
+ wishes to access.
+
+ For more information, see
+ <http://user-mode-linux.sourceforge.net/hostfs.html>.
+
+ If you'd like to be able to work with files stored on the host,
+ say Y or M here; otherwise say N.
+
+config MCONSOLE
+ bool "Management console"
+ depends on PROC_FS
+ default y
+ help
+ The user mode linux management console is a low-level interface to
+ the kernel, somewhat like the i386 SysRq interface. Since there is
+ a full-blown operating system running under every user mode linux
+ instance, there is much greater flexibility possible than with the
+ SysRq mechanism.
+
+ If you answer 'Y' to this option, to use this feature, you need the
+ mconsole client (called uml_mconsole) which is present in CVS in
+ 2.4.5-9um and later (path /tools/mconsole), and is also in the
+ distribution RPM package in 2.4.6 and later.
+
+ It is safe to say 'Y' here.
+
+config MAGIC_SYSRQ
+ bool "Magic SysRq key"
+ depends on MCONSOLE
+ help
+ If you say Y here, you will have some control over the system even
+ if the system crashes for example during kernel debugging (e.g., you
+ will be able to flush the buffer cache to disk, reboot the system
+ immediately or dump some status information). A key for each of the
+ possible requests is provided.
+
+ This is the feature normally accomplished by pressing a key
+ while holding SysRq (Alt+PrintScreen).
+
+ On UML, this is accomplished by sending a "sysrq" command with
+ mconsole, followed by the letter for the requested command.
+
+ The keys are documented in <file:Documentation/admin-guide/sysrq.rst>. Don't say Y
+ unless you really know what this hack does.
+
+config KERNEL_STACK_ORDER
+ int "Kernel stack size order"
+ default 1 if 64BIT
+ range 1 10 if 64BIT
+ default 0 if !64BIT
+ help
+ This option determines the size of UML kernel stacks. They will
+ be 1 << order pages. The default is OK unless you're running Valgrind
+ on UML, in which case, set this to 3.
+
+config MMAPPER
+ tristate "iomem emulation driver"
+ help
+ This driver allows a host file to be used as emulated IO memory inside
+ UML.
+
+config NO_DMA
+ def_bool y
+
+config PGTABLE_LEVELS
+ int
+ default 3 if 3_LEVEL_PGTABLES
+ default 2
+
+config SECCOMP
+ def_bool y
+ prompt "Enable seccomp to safely compute untrusted bytecode"
+ ---help---
+ This kernel feature is useful for number crunching applications
+ that may need to compute untrusted bytecode during their
+ execution. By using pipes or other transports made available to
+ the process as file descriptors supporting the read/write
+ syscalls, it's possible to isolate those applications in
+ their own address space using seccomp. Once seccomp is
+ enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
+ and the task is only allowed to execute a few safe syscalls
+ defined by each seccomp mode.
+
+ If unsure, say Y.
+
+endmenu
+
+source "init/Kconfig"
+
+source "kernel/Kconfig.freezer"
+
+source "arch/um/Kconfig.char"
+
+source "drivers/Kconfig"
+
+source "net/Kconfig"
+
+source "arch/um/Kconfig.net"
+
+source "fs/Kconfig"
+
+source "security/Kconfig"
+
+source "crypto/Kconfig"
+
+source "lib/Kconfig"
+
+source "arch/um/Kconfig.debug"
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
deleted file mode 100644
index 07f84c842cc3..000000000000
--- a/arch/um/Kconfig.common
+++ /dev/null
@@ -1,60 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-config UML
- bool
- default y
- select ARCH_HAS_KCOV
- select HAVE_ARCH_AUDITSYSCALL
- select HAVE_ARCH_SECCOMP_FILTER
- select HAVE_UID16
- select HAVE_FUTEX_CMPXCHG if FUTEX
- select HAVE_DEBUG_KMEMLEAK
- select GENERIC_IRQ_SHOW
- select GENERIC_CPU_DEVICES
- select GENERIC_CLOCKEVENTS
- select HAVE_GCC_PLUGINS
- select TTY # Needed for line.c
-
-config MMU
- bool
- default y
-
-config NO_IOMEM
- def_bool y
-
-config ISA
- bool
-
-config SBUS
- bool
-
-config PCI
- bool
-
-config PCMCIA
- bool
-
-config TRACE_IRQFLAGS_SUPPORT
- bool
- default y
-
-config LOCKDEP_SUPPORT
- bool
- default y
-
-config STACKTRACE_SUPPORT
- bool
- default y
- select STACKTRACE
-
-config GENERIC_CALIBRATE_DELAY
- bool
- default y
-
-config HZ
- int
- default 100
-
-config NR_CPUS
- int
- range 1 1
- default 1
diff --git a/arch/um/Kconfig.rest b/arch/um/Kconfig.rest
deleted file mode 100644
index 08327b9c0cbe..000000000000
--- a/arch/um/Kconfig.rest
+++ /dev/null
@@ -1,22 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-source "init/Kconfig"
-
-source "kernel/Kconfig.freezer"
-
-source "arch/um/Kconfig.char"
-
-source "drivers/Kconfig"
-
-source "net/Kconfig"
-
-source "arch/um/Kconfig.net"
-
-source "fs/Kconfig"
-
-source "security/Kconfig"
-
-source "crypto/Kconfig"
-
-source "lib/Kconfig"
-
-source "arch/um/Kconfig.debug"
diff --git a/arch/um/Kconfig.um b/arch/um/Kconfig.um
deleted file mode 100644
index 20da5a8ca949..000000000000
--- a/arch/um/Kconfig.um
+++ /dev/null
@@ -1,124 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-config STATIC_LINK
- bool "Force a static link"
- default n
- help
- This option gives you the ability to force a static link of UML.
- Normally, UML is linked as a shared binary. This is inconvenient for
- use in a chroot jail. So, if you intend to run UML inside a chroot,
- you probably want to say Y here.
- Additionally, this option enables using higher memory spaces (up to
- 2.75G) for UML.
-
-source "mm/Kconfig"
-
-config LD_SCRIPT_STATIC
- bool
- default y
- depends on STATIC_LINK
-
-config LD_SCRIPT_DYN
- bool
- default y
- depends on !LD_SCRIPT_STATIC
- select MODULE_REL_CRCS if MODVERSIONS
-
-source "fs/Kconfig.binfmt"
-
-config HOSTFS
- tristate "Host filesystem"
- help
- While the User-Mode Linux port uses its own root file system for
- booting and normal file access, this module lets the UML user
- access files stored on the host. It does not require any
- network connection between the Host and UML. An example use of
- this might be:
-
- mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
-
- where /tmp/fromhost is an empty directory inside UML and
- /tmp/umlshare is a directory on the host with files the UML user
- wishes to access.
-
- For more information, see
- <http://user-mode-linux.sourceforge.net/hostfs.html>.
-
- If you'd like to be able to work with files stored on the host,
- say Y or M here; otherwise say N.
-
-config MCONSOLE
- bool "Management console"
- depends on PROC_FS
- default y
- help
- The user mode linux management console is a low-level interface to
- the kernel, somewhat like the i386 SysRq interface. Since there is
- a full-blown operating system running under every user mode linux
- instance, there is much greater flexibility possible than with the
- SysRq mechanism.
-
- If you answer 'Y' to this option, to use this feature, you need the
- mconsole client (called uml_mconsole) which is present in CVS in
- 2.4.5-9um and later (path /tools/mconsole), and is also in the
- distribution RPM package in 2.4.6 and later.
-
- It is safe to say 'Y' here.
-
-config MAGIC_SYSRQ
- bool "Magic SysRq key"
- depends on MCONSOLE
- help
- If you say Y here, you will have some control over the system even
- if the system crashes for example during kernel debugging (e.g., you
- will be able to flush the buffer cache to disk, reboot the system
- immediately or dump some status information). A key for each of the
- possible requests is provided.
-
- This is the feature normally accomplished by pressing a key
- while holding SysRq (Alt+PrintScreen).
-
- On UML, this is accomplished by sending a "sysrq" command with
- mconsole, followed by the letter for the requested command.
-
- The keys are documented in <file:Documentation/admin-guide/sysrq.rst>. Don't say Y
- unless you really know what this hack does.
-
-config KERNEL_STACK_ORDER
- int "Kernel stack size order"
- default 1 if 64BIT
- range 1 10 if 64BIT
- default 0 if !64BIT
- help
- This option determines the size of UML kernel stacks. They will
- be 1 << order pages. The default is OK unless you're running Valgrind
- on UML, in which case, set this to 3.
-
-config MMAPPER
- tristate "iomem emulation driver"
- help
- This driver allows a host file to be used as emulated IO memory inside
- UML.
-
-config NO_DMA
- def_bool y
-
-config PGTABLE_LEVELS
- int
- default 3 if 3_LEVEL_PGTABLES
- default 2
-
-config SECCOMP
- def_bool y
- prompt "Enable seccomp to safely compute untrusted bytecode"
- ---help---
- This kernel feature is useful for number crunching applications
- that may need to compute untrusted bytecode during their
- execution. By using pipes or other transports made available to
- the process as file descriptors supporting the read/write
- syscalls, it's possible to isolate those applications in
- their own address space using seccomp. Once seccomp is
- enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
- and the task is only allowed to execute a few safe syscalls
- defined by each seccomp mode.
-
- If unsure, say Y.
diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index 7e509c83d80d..f518b4744ff8 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -1,9 +1,5 @@
# SPDX-License-Identifier: GPL-2.0

-source "arch/um/Kconfig.common"
-
-menu "UML-specific options"
-
menu "Host processor type and features"

source "arch/x86/Kconfig.cpu"
@@ -61,9 +57,3 @@ config ARCH_REUSE_HOST_VSYSCALL_AREA

config GENERIC_HWEIGHT
def_bool y
-
-source "arch/um/Kconfig.um"
-
-endmenu
-
-source "arch/um/Kconfig.rest"
--
2.18.0
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