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authorRusty Russell <rusty@rustcorp.com.au>2009-06-12 22:27:02 -0600
committerRusty Russell <rusty@rustcorp.com.au>2009-06-12 22:27:02 +0930
commitabd41f037e1a64543000ed73b42f616d04d92700 (patch)
treed9013e66f4d8fc66fc92ce0587f8d126e156b253 /drivers/lguest/lg.h
parentebf9a5a99c1a464afe0b4dfa64416fc8b273bc5c (diff)
downloadop-kernel-dev-abd41f037e1a64543000ed73b42f616d04d92700.zip
op-kernel-dev-abd41f037e1a64543000ed73b42f616d04d92700.tar.gz
lguest: fix race in halt code
When the Guest does the LHCALL_HALT hypercall, we go to sleep, expecting that a timer or the Waker will wake_up_process() us. But we do it in a stupid way, leaving a classic missing wakeup race. So split maybe_do_interrupt() into interrupt_pending() and try_deliver_interrupt(), and check maybe_do_interrupt() and the "break_out" flag before calling schedule. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/lg.h')
-rw-r--r--drivers/lguest/lg.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
index af92a17..6743cf1 100644
--- a/drivers/lguest/lg.h
+++ b/drivers/lguest/lg.h
@@ -139,7 +139,8 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user);
#define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT)
/* interrupts_and_traps.c: */
-void maybe_do_interrupt(struct lg_cpu *cpu);
+unsigned int interrupt_pending(struct lg_cpu *cpu);
+void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq);
bool deliver_trap(struct lg_cpu *cpu, unsigned int num);
void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int i,
u32 low, u32 hi);
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