diff options
| -rw-r--r-- | sys/i386/isa/ipl.s | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sys/i386/isa/ipl.s b/sys/i386/isa/ipl.s index b28837e45bb9..d429f5ad13ae 100644 --- a/sys/i386/isa/ipl.s +++ b/sys/i386/isa/ipl.s @@ -66,6 +66,16 @@ doreti_next: je doreti_exit /* no, defer */ doreti_ast: + /* + * Check for ASTs atomically with returning. Disabling CPU + * interrupts provides sufficient locking evein the SMP case, + * since we will be informed of any new ASTs by an IPI. + */ + cli + movl PCPU(CURPROC),%eax + testl $PS_ASTPENDING | PS_NEEDRESCHED,P_SFLAG(%eax) + je doreti_exit + sti pushl %esp /* pass a pointer to the trapframe */ call ast add $4,%esp |