diff options
Diffstat (limited to 'drivers/lguest/core.c')
| -rw-r--r-- | drivers/lguest/core.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index a5ebc0083d8..09925230113 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -20,7 +20,7 @@ #include <asm/asm-offsets.h> #include "lg.h" - +unsigned long switcher_addr; static struct vm_struct *switcher_vma; static struct page **switcher_page; @@ -75,25 +75,27 @@ static __init int map_switcher(void) } } + switcher_addr = SWITCHER_ADDR; + /* * First we check that the Switcher won't overlap the fixmap area at * the top of memory. It's currently nowhere near, but it could have * very strange effects if it ever happened. */ - if (SWITCHER_ADDR + (TOTAL_SWITCHER_PAGES+1)*PAGE_SIZE > FIXADDR_START){ + if (switcher_addr + (TOTAL_SWITCHER_PAGES+1)*PAGE_SIZE > FIXADDR_START){ err = -ENOMEM; printk("lguest: mapping switcher would thwack fixmap\n"); goto free_pages; } /* - * Now we reserve the "virtual memory area" we want: 0xFFC00000 - * (SWITCHER_ADDR). We might not get it in theory, but in practice - * it's worked so far. The end address needs +1 because __get_vm_area - * allocates an extra guard page, so we need space for that. + * Now we reserve the "virtual memory area" we want. We might + * not get it in theory, but in practice it's worked so far. + * The end address needs +1 because __get_vm_area allocates an + * extra guard page, so we need space for that. */ switcher_vma = __get_vm_area(TOTAL_SWITCHER_PAGES * PAGE_SIZE, - VM_ALLOC, SWITCHER_ADDR, SWITCHER_ADDR + VM_ALLOC, switcher_addr, switcher_addr + (TOTAL_SWITCHER_PAGES+1) * PAGE_SIZE); if (!switcher_vma) { err = -ENOMEM; @@ -103,7 +105,7 @@ static __init int map_switcher(void) /* * This code actually sets up the pages we've allocated to appear at - * SWITCHER_ADDR. map_vm_area() takes the vma we allocated above, the + * switcher_addr. map_vm_area() takes the vma we allocated above, the * kind of pages we're mapping (kernel pages), and a pointer to our * array of struct pages. It increments that pointer, but we don't * care. |