svn commit: r364525 - in stable/12/sys: amd64/linux amd64/linux32 arm64/linux compat/linux i386/linux
Edward Tomasz Napierala
trasz at FreeBSD.org
Sun Aug 23 20:12:09 UTC 2020
Author: trasz
Date: Sun Aug 23 20:12:07 2020
New Revision: 364525
URL: https://svnweb.freebsd.org/changeset/base/364525
Log:
MFC r356241:
Add basic getcpu(2) support to linuxulator. The purpose of this
syscall is to query the CPU number and the NUMA domain the calling
thread is currently running on. The third argument is ignored.
It doesn't do anything regarding scheduling - it's literally
just a way to query the current state, without any guarantees
you won't get rescheduled an opcode later.
This unbreaks Java from CentOS 8
(java-11-openjdk-11.0.5.10-0.el8_0.x86_64).
Sponsored by: The FreeBSD Foundation
Modified:
stable/12/sys/amd64/linux/linux_dummy.c
stable/12/sys/amd64/linux32/linux32_dummy.c
stable/12/sys/arm64/linux/linux_dummy.c
stable/12/sys/compat/linux/linux_misc.c
stable/12/sys/i386/linux/linux_dummy.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/amd64/linux/linux_dummy.c
==============================================================================
--- stable/12/sys/amd64/linux/linux_dummy.c Sun Aug 23 20:10:10 2020 (r364524)
+++ stable/12/sys/amd64/linux/linux_dummy.c Sun Aug 23 20:12:07 2020 (r364525)
@@ -102,8 +102,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
-/* Linux 2.6.19: */
-DUMMY(getcpu);
/* Linux 2.6.22: */
DUMMY(signalfd);
/* Linux 2.6.27: */
Modified: stable/12/sys/amd64/linux32/linux32_dummy.c
==============================================================================
--- stable/12/sys/amd64/linux32/linux32_dummy.c Sun Aug 23 20:10:10 2020 (r364524)
+++ stable/12/sys/amd64/linux32/linux32_dummy.c Sun Aug 23 20:12:07 2020 (r364525)
@@ -108,8 +108,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
-/* Linux 2.6.19: */
-DUMMY(getcpu);
/* Linux 2.6.22: */
DUMMY(signalfd);
/* Linux 2.6.27: */
Modified: stable/12/sys/arm64/linux/linux_dummy.c
==============================================================================
--- stable/12/sys/arm64/linux/linux_dummy.c Sun Aug 23 20:10:10 2020 (r364524)
+++ stable/12/sys/arm64/linux/linux_dummy.c Sun Aug 23 20:12:07 2020 (r364525)
@@ -104,8 +104,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
-/* Linux 2.6.19: */
-DUMMY(getcpu);
/* Linux 2.6.27: */
DUMMY(signalfd4);
DUMMY(inotify_init1);
Modified: stable/12/sys/compat/linux/linux_misc.c
==============================================================================
--- stable/12/sys/compat/linux/linux_misc.c Sun Aug 23 20:10:10 2020 (r364524)
+++ stable/12/sys/compat/linux/linux_misc.c Sun Aug 23 20:12:07 2020 (r364525)
@@ -2691,3 +2691,19 @@ out:
td->td_retval[0] = dst - args->buf;
return (error);
}
+
+int
+linux_getcpu(struct thread *td, struct linux_getcpu_args *args)
+{
+ int cpu, error, node;
+
+ cpu = td->td_oncpu; /* Make sure it doesn't change during copyout(9) */
+ error = 0;
+ node = 0; /* XXX: Fake NUMA node 0 for now */
+
+ if (args->cpu != NULL)
+ error = copyout(&cpu, args->cpu, sizeof(l_int));
+ if (args->node != NULL)
+ error = copyout(&node, args->node, sizeof(l_int));
+ return (error);
+}
Modified: stable/12/sys/i386/linux/linux_dummy.c
==============================================================================
--- stable/12/sys/i386/linux/linux_dummy.c Sun Aug 23 20:10:10 2020 (r364524)
+++ stable/12/sys/i386/linux/linux_dummy.c Sun Aug 23 20:12:07 2020 (r364525)
@@ -104,8 +104,6 @@ DUMMY(tee);
DUMMY(vmsplice);
/* Linux 2.6.18: */
DUMMY(move_pages);
-/* Linux 2.6.19: */
-DUMMY(getcpu);
/* Linux 2.6.22: */
DUMMY(signalfd);
/* Linux 2.6.27: */
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