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-rw-r--r--drivers/lguest/interrupts_and_traps.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index eb934b0242e0..67392b6ab845 100644
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -331,7 +331,7 @@ void set_interrupt(struct lg_cpu *cpu, unsigned int irq)
* Actually now I think of it, it's possible that Ron *is* half the Plan 9
* userbase. Oh well.
*/
-static bool could_be_syscall(unsigned int num)
+bool could_be_syscall(unsigned int num)
{
/* Normal Linux IA32_SYSCALL_VECTOR or reserved vector? */
return num == IA32_SYSCALL_VECTOR || num == syscall_vector;
@@ -416,6 +416,10 @@ bool deliver_trap(struct lg_cpu *cpu, unsigned int num)
*
* This routine indicates if a particular trap number could be delivered
* directly.
+ *
+ * Unfortunately, Linux 4.6 started using an interrupt gate instead of a
+ * trap gate for syscalls, so this trick is ineffective. See Mastery for
+ * how we could do this anyway...
*/
static bool direct_trap(unsigned int num)
{