On Fri, 16 May 2014, Xiubo Li wrote:
> For each vmalloc area, there is one guard page at the end of it.
> so the vm->size = PAGE_ALIGN(offset + request size) + guard page size.
Nope. There is no guard page for statically created vmalloc areas.
> Signed-off-by: Richard Lee <superlibj8...@gmail.com>
> Signed-off-by: Xiubo Li <li.xi...@freescale.com>
> Cc: Nicolas Pitre <n...@linaro.org>
> Cc: Santosh Shilimkar <santosh.shilim...@ti.com>
> Cc: Joonsoo Kim <iamjoonsoo....@lge.com>
> ---
> arch/arm/mm/ioremap.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
> index be69333..758e8f7 100644
> --- a/arch/arm/mm/ioremap.c
> +++ b/arch/arm/mm/ioremap.c
> @@ -49,14 +49,18 @@ static struct static_vm *find_static_vm_paddr(phys_addr_t
> paddr,
> struct vm_struct *vm;
>
> list_for_each_entry(svm, &static_vmlist, list) {
> + phys_addr_t paddr_end, phys_addr_end;
> +
> vm = &svm->vm;
> if (!(vm->flags & VM_ARM_STATIC_MAPPING))
> continue;
> if ((vm->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
> continue;
>
> - if (vm->phys_addr > paddr ||
> - paddr + size - 1 > vm->phys_addr + vm->size - 1)
> + /* The PAGE_SIZE here is vmalloc area's guard page */
> + phys_addr_end = vm->phys_addr + vm->size - PAGE_SIZE - 1;
> + paddr_end = paddr + size - 1;
> + if (vm->phys_addr > paddr || paddr_end > phys_addr_end)
> continue;
>
> return svm;
> --
> 1.8.4
>
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