Commit d1b069f5 authored by Randy Dunlap's avatar Randy Dunlap Committed by Linus Torvalds
Browse files

EXPERT Kconfig menu: fix broken EXPERT menu 

Clean up the EXPERT menu (yet again).

Move FHANDLE and CHECKPOINT_RESTORE into the primary EXPERT menu since
they already depend on EXPERT.

Move BPF_SYSCALL and USERFAULTFD out of the EXPERT Kconfig symbols menu
list since they do not depend on EXPERT and were breaking the continuity
of that menu list.

Move all of the KALLSYMS Kconfig symbols to the end of the EXPERT menu.
This separates the kernel services from the build options.

This patch depends on [PATCH] pci: move PCI_QUIRKS to the PCI bus menu
(https://lkml.org/lkml/2017/11/2/907).

Link: http://lkml.kernel.org/r/72e4465a-a5ff-cb3c-1a90-11aa4861b161@infradead.org


Signed-off-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>	[BPF]
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7016383b

init/Kconfig

+93 −91
Original line number Diff line number Diff line
@@ -283,19 +283,6 @@ config CROSS_MEMORY_ATTACH 
	  to directly read from or write to another process' address space.

	  See the man page for more details.



config FHANDLE

	bool "open by fhandle syscalls" if EXPERT

	select EXPORTFS

	default y

	help

	  If you say Y here, a user level program will be able to map

	  file names to handle and then later use the handle for

	  different file system operations. This is useful in implementing

	  userspace file servers, which now track files using handles instead

	  of names. The handle would remain the same even if file names

	  get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2)

	  syscalls.



config USELIB

	bool "uselib syscall"

	def_bool ALPHA || M68K || SPARC || X86_32 || IA32_EMULATION
@@ -883,18 +870,6 @@ config SOCK_CGROUP_DATA 


endif # CGROUPS



config CHECKPOINT_RESTORE

	bool "Checkpoint/restore support" if EXPERT

	select PROC_CHILDREN

	default n

	help

	  Enables additional kernel features in a sake of checkpoint/restore.

	  In particular it adds auxiliary prctl codes to setup process text,

	  data and heap segment sizes, and a few additional /proc filesystem

	  entries.



	  If unsure, say N here.



menuconfig NAMESPACES

	bool "Namespaces support" if EXPERT

	depends on MULTIUSER
@@ -1163,6 +1138,19 @@ config SYSCTL_SYSCALL 


	  If unsure say N here.



config FHANDLE

	bool "open by fhandle syscalls" if EXPERT

	select EXPORTFS

	default y

	help

	  If you say Y here, a user level program will be able to map

	  file names to handle and then later use the handle for

	  different file system operations. This is useful in implementing

	  userspace file servers, which now track files using handles instead

	  of names. The handle would remain the same even if file names

	  get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2)

	  syscalls.



config POSIX_TIMERS

	bool "Posix Clocks & timers" if EXPERT

	default y
@@ -1180,54 +1168,6 @@ config POSIX_TIMERS 


	  If unsure say y.



config KALLSYMS

	 bool "Load all symbols for debugging/ksymoops" if EXPERT

	 default y

	 help

	   Say Y here to let the kernel print out symbolic crash information and

	   symbolic stack backtraces. This increases the size of the kernel

	   somewhat, as all symbols have to be loaded into the kernel image.



config KALLSYMS_ALL

	bool "Include all symbols in kallsyms"

	depends on DEBUG_KERNEL && KALLSYMS

	help

	   Normally kallsyms only contains the symbols of functions for nicer

	   OOPS messages and backtraces (i.e., symbols from the text and inittext

	   sections). This is sufficient for most cases. And only in very rare

	   cases (e.g., when a debugger is used) all symbols are required (e.g.,

	   names of variables from the data sections, etc).



	   This option makes sure that all symbols are loaded into the kernel

	   image (i.e., symbols from all sections) in cost of increased kernel

	   size (depending on the kernel configuration, it may be 300KiB or

	   something like this).



	   Say N unless you really need all symbols.



config KALLSYMS_ABSOLUTE_PERCPU

	bool

	depends on KALLSYMS

	default X86_64 && SMP



config KALLSYMS_BASE_RELATIVE

	bool

	depends on KALLSYMS

	default !IA64 && !(TILE && 64BIT)

	help

	  Instead of emitting them as absolute values in the native word size,

	  emit the symbol references in the kallsyms table as 32-bit entries,

	  each containing a relative value in the range [base, base + U32_MAX]

	  or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either

	  an absolute value in the range [0, S32_MAX] or a relative value in the

	  range [base, base + S32_MAX], where base is the lowest relative symbol

	  address encountered in the image.



	  On 64-bit builds, this reduces the size of the address table by 50%,

	  but more importantly, it results in entries whose values are build

	  time constants, and no relocation pass is required at runtime to fix

	  up the entries based on the runtime load address of the kernel.



config PRINTK

	default y

	bool "Enable support for printk" if EXPERT
@@ -1339,16 +1279,6 @@ config EVENTFD 


	  If unsure, say Y.



# syscall, maps, verifier

config BPF_SYSCALL

	bool "Enable bpf() system call"

	select ANON_INODES

	select BPF

	default n

	help

	  Enable the bpf() system call that allows to manipulate eBPF

	  programs and maps via file descriptors.



config SHMEM

	bool "Use full shmem filesystem" if EXPERT

	default y
@@ -1378,14 +1308,6 @@ config ADVISE_SYSCALLS 
	  applications use these syscalls, you can disable this option to save

	  space.



config USERFAULTFD

	bool "Enable userfaultfd() system call"

	select ANON_INODES

	depends on MMU

	help

	  Enable the userfaultfd() system call that allows to intercept and

	  handle page faults in userland.



config MEMBARRIER

	bool "Enable membarrier() system call" if EXPERT

	default y
@@ -1398,6 +1320,86 @@ config MEMBARRIER 


	  If unsure, say Y.



config CHECKPOINT_RESTORE

	bool "Checkpoint/restore support" if EXPERT

	select PROC_CHILDREN

	default n

	help

	  Enables additional kernel features in a sake of checkpoint/restore.

	  In particular it adds auxiliary prctl codes to setup process text,

	  data and heap segment sizes, and a few additional /proc filesystem

	  entries.



	  If unsure, say N here.



config KALLSYMS

	 bool "Load all symbols for debugging/ksymoops" if EXPERT

	 default y

	 help

	   Say Y here to let the kernel print out symbolic crash information and

	   symbolic stack backtraces. This increases the size of the kernel

	   somewhat, as all symbols have to be loaded into the kernel image.



config KALLSYMS_ALL

	bool "Include all symbols in kallsyms"

	depends on DEBUG_KERNEL && KALLSYMS

	help

	   Normally kallsyms only contains the symbols of functions for nicer

	   OOPS messages and backtraces (i.e., symbols from the text and inittext

	   sections). This is sufficient for most cases. And only in very rare

	   cases (e.g., when a debugger is used) all symbols are required (e.g.,

	   names of variables from the data sections, etc).



	   This option makes sure that all symbols are loaded into the kernel

	   image (i.e., symbols from all sections) in cost of increased kernel

	   size (depending on the kernel configuration, it may be 300KiB or

	   something like this).



	   Say N unless you really need all symbols.



config KALLSYMS_ABSOLUTE_PERCPU

	bool

	depends on KALLSYMS

	default X86_64 && SMP



config KALLSYMS_BASE_RELATIVE

	bool

	depends on KALLSYMS

	default !IA64 && !(TILE && 64BIT)

	help

	  Instead of emitting them as absolute values in the native word size,

	  emit the symbol references in the kallsyms table as 32-bit entries,

	  each containing a relative value in the range [base, base + U32_MAX]

	  or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either

	  an absolute value in the range [0, S32_MAX] or a relative value in the

	  range [base, base + S32_MAX], where base is the lowest relative symbol

	  address encountered in the image.



	  On 64-bit builds, this reduces the size of the address table by 50%,

	  but more importantly, it results in entries whose values are build

	  time constants, and no relocation pass is required at runtime to fix

	  up the entries based on the runtime load address of the kernel.



# end of the "standard kernel features (expert users)" menu



# syscall, maps, verifier

config BPF_SYSCALL

	bool "Enable bpf() system call"

	select ANON_INODES

	select BPF

	default n

	help

	  Enable the bpf() system call that allows to manipulate eBPF

	  programs and maps via file descriptors.



config USERFAULTFD

	bool "Enable userfaultfd() system call"

	select ANON_INODES

	depends on MMU

	help

	  Enable the userfaultfd() system call that allows to intercept and

	  handle page faults in userland.



config EMBEDDED

	bool "Embedded system"

	option allnoconfig_y

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