[PATCH] i386: fix get_segment_eip() with vm86 segments

[safe/jmp/linux-2.6] / arch / i386 / mm / fault.c

diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index f38085f..bd6fe96 100644 (file)
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -77,12 +77,15 @@ static inline unsigned long get_segment_eip(struct pt_regs *regs,
        unsigned seg = regs->xcs & 0xffff;
        u32 seg_ar, seg_limit, base, *desc;
 
+       /* Unlikely, but must come before segment checks. */
+       if (unlikely(regs->eflags & VM_MASK)) {
+               base = seg << 4;
+               *eip_limit = base + 0xffff;
+               return base + (eip & 0xffff);
+       }
+
        /* The standard kernel/user address space limit. */
        *eip_limit = (seg & 3) ? USER_DS.seg : KERNEL_DS.seg;
-
-       /* Unlikely, but must come before segment checks. */
-       if (unlikely((regs->eflags & VM_MASK) != 0))
-               return eip + (seg << 4);
        
        /* By far the most common cases. */
        if (likely(seg == __USER_CS || seg == __KERNEL_CS))