Here is another place where interrupts get turned on in a called
function:
work_resched disables interrupts and falls through to work_notifysig.
work_notifysig calls do_notify_resume.
do_notify_resume calls do_signal.
do_signal calls get_signal_to_deliver.
get_signal_to_deliver does an spin_unlock_irq before returning,
enabling interrupts.
Is this a bug?
work_resched:
sti
call schedule
cli # make sure we don't miss an interrupt
# setting need_resched or sigpending
# between sampling and the iret
movl TI_FLAGS(%ebp), %ecx
andl $_TIF_WORK_MASK, %ecx # is there any work to be done other
# than syscall tracing?
jz restore_all
testb $_TIF_NEED_RESCHED, %cl
jnz work_resched
work_notifysig: # deal with pending signals and
# notify-resume requests
testl $VM_MASK, EFLAGS(%esp)
movl %esp, %eax
jne work_notifysig_v86 # returning to kernel-space or
# vm86-space
xorl %edx, %edx
call do_notify_resume <== may enable interrupts
jmp restore_all
ALIGN
work_notifysig_v86:
pushl %ecx
call save_v86_state
popl %ecx
movl %eax, %esp
xorl %edx, %edx
call do_notify_resume <== may enable interrupts
jmp restore_all
-
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This archive was generated by hypermail 2b29 : Fri May 23 2003 - 22:00:51 EST