diff options
| author | Tiwei Bie <tiwei.btw@antgroup.com> | 2025-10-27 08:18:10 +0800 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2025-10-27 16:41:15 +0100 |
| commit | 2670917c2fc8902558f3aba4f41e5cc5bf6e18fa (patch) | |
| tree | 257b673beaa85834ea9af4e664ba34c71c40b7ad /arch/um/os-Linux/signal.c | |
| parent | 9e5a9f1c9b336871c8e76c1cefd85182c5b58541 (diff) | |
um: Determine sleep based on need_resched()
With SMP and NO_HZ enabled, the CPU may still need to sleep even
if the timer is disarmed. Switch to deciding whether to sleep based
on pending resched. Additionally, because disabling IRQs does not
block SIGALRM, it is also necessary to check for any pending timer
alarms. This is a preparation for adding SMP support.
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20251027001815.1666872-4-tiwei.bie@linux.dev
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um/os-Linux/signal.c')
| -rw-r--r-- | arch/um/os-Linux/signal.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index 58da8c6ece98..554a87dd32cc 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -20,6 +20,7 @@ #include <um_malloc.h> #include <sys/ucontext.h> #include <timetravel.h> +#include "internal.h" void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *, void *mc) = { [SIGTRAP] = relay_signal, @@ -159,6 +160,11 @@ void timer_set_signal_handler(void) set_handler(SIGALRM); } +int timer_alarm_pending(void) +{ + return !!(signals_pending & SIGALRM_MASK); +} + void set_sigstack(void *sig_stack, int size) { stack_t stack = { |