On Mon, Mar 20, 2017 at 10:40:20AM +0530, Aneesh Kumar K.V wrote: > "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> writes: > @@ -168,6 +182,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > > unsigned long addr = addr0; > > struct vm_unmapped_area_info info; > > > > + addr = mpx_unmapped_area_check(addr, len, flags); > > + if (IS_ERR_VALUE(addr)) > > + return addr; > > + > > /* requested length too big for entire address space */ > > if (len > TASK_SIZE) > > return -ENOMEM; > > @@ -192,6 +210,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > > info.length = len; > > info.low_limit = PAGE_SIZE; > > info.high_limit = mm->mmap_base; > > + > > + /* > > + * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area > > + * in the full address space. > > + */ > > + if (addr > DEFAULT_MAP_WINDOW) > > + info.high_limit += TASK_SIZE - DEFAULT_MAP_WINDOW; > > + > > Is this ok for 32 bit application ? DEFAULT_MAP_WINDOW is equal to TASK_SIZE on 32-bit, so it's nop and will be compile out. -- Kirill A. Shutemov
