2 files changed, 4 insertions, 4 deletions

diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index e6e4506e749a..8713e0248a0b 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -515,7 +515,7 @@ ENTRY(irq_entries_start)
  .if vector
         CFI_ADJUST_CFA_OFFSET -4
  .endif
-1:      pushl $vector-256
+1:      pushl $~(vector)
         CFI_ADJUST_CFA_OFFSET 4
         jmp common_interrupt
 .data
@@ -535,7 +535,7 @@ common_interrupt:
 #define BUILD_INTERRUPT(name, nr)       \
 ENTRY(name)                             \
         RING0_INT_FRAME;                \
-        pushl $nr-256;                  \
+        pushl $~(nr);                   \
         CFI_ADJUST_CFA_OFFSET 4;        \
         SAVE_ALL;                       \
         movl %esp,%eax;                 \
diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c
index 061533e0cb5e..586b15f6741f 100644
--- a/arch/i386/kernel/irq.c
+++ b/arch/i386/kernel/irq.c
@@ -53,8 +53,8 @@ static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
  */
 fastcall unsigned int do_IRQ(struct pt_regs *regs)
 {       
-        /* high bits used in ret_from_ code */
-        int irq = regs->orig_eax & 0xff;
+        /* high bit used in ret_from_ code */
+        int irq = ~regs->orig_eax;
 #ifdef CONFIG_4KSTACKS
         union irq_ctx *curctx, *irqctx;
         u32 *isp;