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83fe27ea53
SRCU is not necessary to be compiled by default in all cases. For tinification efforts not compiling SRCU unless necessary is desirable. The current patch tries to make compiling SRCU optional by introducing a new Kconfig option CONFIG_SRCU which is selected when any of the components making use of SRCU are selected. If we do not select CONFIG_SRCU, srcu.o will not be compiled at all. text data bss dec hex filename 2007 0 0 2007 7d7 kernel/rcu/srcu.o Size of arch/powerpc/boot/zImage changes from text data bss dec hex filename 831552 64180 23944 919676 e087c arch/powerpc/boot/zImage : before 829504 64180 23952 917636 e0084 arch/powerpc/boot/zImage : after so the savings are about ~2000 bytes. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com> CC: Josh Triplett <josh@joshtriplett.org> CC: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: resolve conflict due to removal of arch/ia64/kvm/Kconfig. ]
91 lines
2.9 KiB
Text
91 lines
2.9 KiB
Text
config BTRFS_FS
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tristate "Btrfs filesystem support"
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select CRYPTO
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select CRYPTO_CRC32C
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select ZLIB_INFLATE
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select ZLIB_DEFLATE
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select LZO_COMPRESS
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select LZO_DECOMPRESS
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select RAID6_PQ
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select XOR_BLOCKS
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select SRCU
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help
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Btrfs is a general purpose copy-on-write filesystem with extents,
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writable snapshotting, support for multiple devices and many more
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features focused on fault tolerance, repair and easy administration.
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The filesystem disk format is no longer unstable, and it's not
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expected to change unless there are strong reasons to do so. If there
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is a format change, file systems with a unchanged format will
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continue to be mountable and usable by newer kernels.
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For more information, please see the web pages at
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http://btrfs.wiki.kernel.org.
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To compile this file system support as a module, choose M here. The
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module will be called btrfs.
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If unsure, say N.
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config BTRFS_FS_POSIX_ACL
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bool "Btrfs POSIX Access Control Lists"
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depends on BTRFS_FS
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select FS_POSIX_ACL
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help
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POSIX Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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To learn more about Access Control Lists, visit the POSIX ACLs for
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Linux website <http://acl.bestbits.at/>.
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If you don't know what Access Control Lists are, say N
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config BTRFS_FS_CHECK_INTEGRITY
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bool "Btrfs with integrity check tool compiled in (DANGEROUS)"
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depends on BTRFS_FS
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help
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Adds code that examines all block write requests (including
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writes of the super block). The goal is to verify that the
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state of the filesystem on disk is always consistent, i.e.,
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after a power-loss or kernel panic event the filesystem is
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in a consistent state.
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If the integrity check tool is included and activated in
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the mount options, plenty of kernel memory is used, and
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plenty of additional CPU cycles are spent. Enabling this
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functionality is not intended for normal use.
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In most cases, unless you are a btrfs developer who needs
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to verify the integrity of (super)-block write requests
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during the run of a regression test, say N
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config BTRFS_FS_RUN_SANITY_TESTS
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bool "Btrfs will run sanity tests upon loading"
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depends on BTRFS_FS
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help
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This will run some basic sanity tests on the free space cache
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code to make sure it is acting as it should. These are mostly
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regression tests and are only really interesting to btrfs
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developers.
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If unsure, say N.
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config BTRFS_DEBUG
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bool "Btrfs debugging support"
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depends on BTRFS_FS
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help
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Enable run-time debugging support for the btrfs filesystem. This may
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enable additional and expensive checks with negative impact on
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performance, or export extra information via sysfs.
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If unsure, say N.
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config BTRFS_ASSERT
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bool "Btrfs assert support"
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depends on BTRFS_FS
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help
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Enable run-time assertion checking. This will result in panics if
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any of the assertions trip. This is meant for btrfs developers only.
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If unsure, say N.
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