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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2018-06-02 08:43:57 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-06-06 11:58:31 +0200 |
| commit | 338035edc9b96cd63f4bc823db5f36c617c560bf (patch) | |
| tree | efd00526f86eaa2cef3164b2b901a60672452a5c /arch/arm/tools | |
| parent | b74406f37737c91c5ede7c625d9d31482a8a4290 (diff) | |
| download | blackbird-op-linux-338035edc9b96cd63f4bc823db5f36c617c560bf.tar.gz blackbird-op-linux-338035edc9b96cd63f4bc823db5f36c617c560bf.zip | |
arm: Wire up restartable sequences system call
Wire up the rseq system call on 32-bit ARM.
This provides an ABI improving the speed of a user-space getcpu
operation on ARM by skipping the getcpu system call on the fast path, as
well as improving the speed of user-space operations on per-cpu data
compared to using load-linked/store-conditional.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Joel Fernandes <joelaf@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Watson <davejwatson@fb.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Chris Lameter <cl@linux.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Andrew Hunter <ahh@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Paul Turner <pjt@google.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Maurer <bmaurer@fb.com>
Cc: linux-api@vger.kernel.org
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lkml.kernel.org/r/20180602124408.8430-6-mathieu.desnoyers@efficios.com
Diffstat (limited to 'arch/arm/tools')
| -rw-r--r-- | arch/arm/tools/syscall.tbl | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl index 0bb0e9c6376c..fbc74b5fa3ed 100644 --- a/arch/arm/tools/syscall.tbl +++ b/arch/arm/tools/syscall.tbl @@ -412,3 +412,4 @@ 395 common pkey_alloc sys_pkey_alloc 396 common pkey_free sys_pkey_free 397 common statx sys_statx +398 common rseq sys_rseq |
