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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2018-07-09 15:51:52 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-07-10 22:18:52 +0200 |
| commit | 0fb9a1abc8c97f858997e962694eb36b4517144e (patch) | |
| tree | d5f3946856cca81320108be58e7099fd4b6c52b6 /kernel/rseq.c | |
| parent | 8f28177014925f968baf45fc833c25848faf8c1c (diff) | |
| download | linux-stable-0fb9a1abc8c97f858997e962694eb36b4517144e.tar.gz linux-stable-0fb9a1abc8c97f858997e962694eb36b4517144e.tar.bz2 linux-stable-0fb9a1abc8c97f858997e962694eb36b4517144e.zip | |
rseq: uapi: Update uapi comments
Update rseq uapi header comments to reflect that user-space need to do
thread-local loads/stores from/to the struct rseq fields.
As a consequence of this added requirement, the kernel does not need
to perform loads/stores with single-copy atomicity.
Update the comment associated to the "flags" fields to describe
more accurately that it's only useful to facilitate single-stepping
through rseq critical sections with debuggers.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-api@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Watson <davejwatson@fb.com>
Cc: Paul Turner <pjt@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Chris Lameter <cl@linux.com>
Cc: Ben Maurer <bmaurer@fb.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Joel Fernandes <joelaf@google.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20180709195155.7654-4-mathieu.desnoyers@efficios.com
Diffstat (limited to 'kernel/rseq.c')
| -rw-r--r-- | kernel/rseq.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rseq.c b/kernel/rseq.c index 2c8463acb50d..2a7748675be7 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -201,7 +201,7 @@ static int clear_rseq_cs(struct task_struct *t) * of code outside of the rseq assembly block. This performs * a lazy clear of the rseq_cs field. * - * Set rseq_cs to NULL with single-copy atomicity. + * Set rseq_cs to NULL. */ return put_user(0UL, &t->rseq->rseq_cs); } |