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Add basic getcpu(2) support to linuxulator. The purpose of this

Browse Source 
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).

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22972
This commit is contained in:
trasz 2019-12-31 22:01:08 +00:00
parent db39757b73
commit f870efbd57
5 changed files with 16 additions and 8 deletions
sys
amd64
linux
linux_dummy.c
linux32
linux32_dummy.c
arm64/linux
linux_dummy.c
compat/linux
linux_misc.c
i386/linux
linux_dummy.c

2
sys/amd64/linux/linux_dummy.c

@ -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: */

2
sys/amd64/linux32/linux32_dummy.c

@ -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: */

2
sys/arm64/linux/linux_dummy.c

@ -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);

16
sys/compat/linux/linux_misc.c

@ -2353,3 +2353,19 @@ 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);
}

2
sys/i386/linux/linux_dummy.c

@ -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: */