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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-10 10:17:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-10 10:17:09 -0700 |
| commit | d82991a8688ad128b46db1b42d5d84396487a508 (patch) | |
| tree | a0743d346c23df3dd057c89b83100c09a376224a /init | |
| parent | f4e5b30d809d3882c69f43b5c90779af033d40c4 (diff) | |
| parent | ccba8b64452b8dbf2c9670de026d00f519bb5da0 (diff) | |
| download | lwn-d82991a8688ad128b46db1b42d5d84396487a508.tar.gz lwn-d82991a8688ad128b46db1b42d5d84396487a508.zip | |
Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull restartable sequence support from Thomas Gleixner:
"The restartable sequences syscall (finally):
After a lot of back and forth discussion and massive delays caused by
the speculative distraction of maintainers, the core set of
restartable sequences has finally reached a consensus.
It comes with the basic non disputed core implementation along with
support for arm, powerpc and x86 and a full set of selftests
It was exposed to linux-next earlier this week, so it does not fully
comply with the merge window requirements, but there is really no
point to drag it out for yet another cycle"
* 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
rseq/selftests: Provide Makefile, scripts, gitignore
rseq/selftests: Provide parametrized tests
rseq/selftests: Provide basic percpu ops test
rseq/selftests: Provide basic test
rseq/selftests: Provide rseq library
selftests/lib.mk: Introduce OVERRIDE_TARGETS
powerpc: Wire up restartable sequences system call
powerpc: Add syscall detection for restartable sequences
powerpc: Add support for restartable sequences
x86: Wire up restartable sequence system call
x86: Add support for restartable sequences
arm: Wire up restartable sequences system call
arm: Add syscall detection for restartable sequences
arm: Add restartable sequences support
rseq: Introduce restartable sequences system call
uapi/headers: Provide types_32_64.h
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 22ca30f6a6bd..d2b8b2ea097e 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1428,6 +1428,29 @@ config ARCH_HAS_MEMBARRIER_CALLBACKS config ARCH_HAS_MEMBARRIER_SYNC_CORE bool +config RSEQ + bool "Enable rseq() system call" if EXPERT + default y + depends on HAVE_RSEQ + select MEMBARRIER + help + Enable the restartable sequences system call. It provides a + user-space cache for the current CPU number value, which + speeds up getting the current CPU number from user-space, + as well as an ABI to speed up user-space operations on + per-CPU data. + + If unsure, say Y. + +config DEBUG_RSEQ + default n + bool "Enabled debugging of rseq() system call" if EXPERT + depends on RSEQ && DEBUG_KERNEL + help + Enable extra debugging checks for the rseq system call. + + If unsure, say N. + config EMBEDDED bool "Embedded system" option allnoconfig_y |