[src/trunk]: src/sys/kern entropy(9): Reduce global entropy lock from IPL_VM ...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b5046c26e7b6
branches:  trunk
changeset: 363956:b5046c26e7b6
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Fri Mar 18 23:35:19 2022 +0000

description:
entropy(9): Reduce global entropy lock from IPL_VM to IPL_SOFTSERIAL.

This is no longer ever taken in hard interrupt context, so there's no
longer any need to block interrupts while doing crypto operations on
the global entropy pool.

diffstat:

 sys/kern/kern_entropy.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 46fdf1460c49 -r b5046c26e7b6 sys/kern/kern_entropy.c
--- a/sys/kern/kern_entropy.c   Fri Mar 18 23:35:07 2022 +0000
+++ b/sys/kern/kern_entropy.c   Fri Mar 18 23:35:19 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_entropy.c,v 1.38 2022/03/18 23:35:07 riastradh Exp $      */
+/*     $NetBSD: kern_entropy.c,v 1.39 2022/03/18 23:35:19 riastradh Exp $      */
 
 /*-
  * Copyright (c) 2019 The NetBSD Foundation, Inc.
@@ -75,7 +75,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_entropy.c,v 1.38 2022/03/18 23:35:07 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_entropy.c,v 1.39 2022/03/18 23:35:19 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -366,7 +366,7 @@
            NULL, 0, &E->epoch, 0, CTL_CREATE, CTL_EOL);
 
        /* Initialize the global state for multithreaded operation.  */
-       mutex_init(&E->lock, MUTEX_DEFAULT, IPL_VM);
+       mutex_init(&E->lock, MUTEX_DEFAULT, IPL_SOFTSERIAL);
        cv_init(&E->cv, "entropy");
        selinit(&E->selq);
        cv_init(&E->sourcelock_cv, "entsrclock");