Merge branch 'linux-2.6'

[linux-2.6] / drivers / lguest / interrupts_and_traps.c

diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index 49aa55577d0dec0e2543c2a8801b91ebc98b1359..39731232d82770ecc3a4bb0d76cb27d4b9578621 100644 (file)
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -270,8 +270,11 @@ void pin_stack_pages(struct lguest *lg)
        /* Depending on the CONFIG_4KSTACKS option, the Guest can have one or
         * two pages of stack space. */
        for (i = 0; i < lg->stack_pages; i++)
-               /* The stack grows *upwards*, hence the subtraction */
-               pin_page(lg, lg->esp1 - i * PAGE_SIZE);
+               /* The stack grows *upwards*, so the address we're given is the
+                * start of the page after the kernel stack.  Subtract one to
+                * get back onto the first stack page, and keep subtracting to
+                * get to the rest of the stack pages. */
+               pin_page(lg, lg->esp1 - 1 - i * PAGE_SIZE);
 }
 
 /* Direct traps also mean that we need to know whenever the Guest wants to use