diff options
| author | Tiwei Bie <tiwei.btw@antgroup.com> | 2025-10-27 08:18:12 +0800 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2025-10-27 16:41:15 +0100 |
| commit | 1e4ee5135d814fe4785890790cec81c3132888fb (patch) | |
| tree | b88d4e37829af3c801081a25d2a08ce23600f59c /arch/um/os-Linux/internal.h | |
| parent | 9c82de55d4783e906f18219f833ad97fd8d9c5df (diff) | |
um: Add initial SMP support
Add initial symmetric multi-processing (SMP) support to UML. With
this support enabled, users can tell UML to start multiple virtual
processors, each represented as a separate host thread.
In UML, kthreads and normal threads (when running in kernel mode)
can be scheduled and executed simultaneously on different virtual
processors. However, the userspace code of normal threads still
runs within their respective single-threaded stubs.
That is, SMP support is currently available both within the kernel
and across different processes, but still remains limited within
threads of the same process in userspace.
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20251027001815.1666872-6-tiwei.bie@linux.dev
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um/os-Linux/internal.h')
| -rw-r--r-- | arch/um/os-Linux/internal.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/um/os-Linux/internal.h b/arch/um/os-Linux/internal.h index c2c7a0dc673c..bac9fcc8c14c 100644 --- a/arch/um/os-Linux/internal.h +++ b/arch/um/os-Linux/internal.h @@ -4,6 +4,7 @@ #include <mm_id.h> #include <stub-data.h> +#include <signal.h> /* * elf_aux.c @@ -18,6 +19,7 @@ void check_tmpexec(void); /* * signal.c */ +extern __thread int signals_enabled; int timer_alarm_pending(void); /* @@ -25,4 +27,10 @@ int timer_alarm_pending(void); */ void wait_stub_done(int pid); void wait_stub_done_seccomp(struct mm_id *mm_idp, int running, int wait_sigsys); + +/* + * smp.c + */ +#define IPI_SIGNAL SIGRTMIN + #endif /* __UM_OS_LINUX_INTERNAL_H */ |