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vmem_alloc() with VM_SLEEP cannot fail, so percpu_alloc() cannot fail either.

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This commit is contained in:
chs 2017-05-31 23:54:17 +00:00
parent c85613c074
commit 1f0e167178
2 changed files with 7 additions and 10 deletions
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8
share/man/man9/percpu.9
View File

@ -1,4 +1,4 @@
.\" $NetBSD: percpu.9,v 1.11 2014/03/18 18:20:40 riastradh Exp $
.\" $NetBSD: percpu.9,v 1.12 2017/05/31 23:54:17 chs Exp $
.\"
.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd January 23, 2010
.Dd May 31, 2017
.Dt PERCPU 9
.Os
.Sh NAME
@ -84,9 +84,7 @@ bytes of local storage on each CPU.
The storage is initialized with zeroes.
Treat this as an expensive operation.
.Fn percpu_alloc
returns
.Dv NULL
on failure, and a handle for the per-CPU storage on success.
returns a handle for the per-CPU storage.
.It Fn percpu_free "pc" "size"
Call this in thread context to
return to the system the per-CPU storage held by

9
sys/kern/subr_percpu.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: subr_percpu.c,v 1.17 2014/11/27 15:00:00 uebayasi Exp $ */
/* $NetBSD: subr_percpu.c,v 1.18 2017/05/31 23:54:17 chs Exp $ */
/*-
* Copyright (c)2007,2008 YAMAMOTO Takashi,
@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_percpu.c,v 1.17 2014/11/27 15:00:00 uebayasi Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_percpu.c,v 1.18 2017/05/31 23:54:17 chs Exp $");
#include <sys/param.h>
#include <sys/cpu.h>
@ -257,9 +257,8 @@ percpu_alloc(size_t size)
percpu_t *pc;
ASSERT_SLEEPABLE();
if (vmem_alloc(percpu_offset_arena, size, VM_SLEEP | VM_BESTFIT,
&offset) != 0)
return NULL;
(void)vmem_alloc(percpu_offset_arena, size, VM_SLEEP | VM_BESTFIT,
&offset);
pc = (percpu_t *)percpu_encrypt((uintptr_t)offset);
percpu_zero(pc, size);
return pc;