| Message ID | 20190619054224.5983-2-alex@ghiti.fr (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Fix mmap base in bottom-up mmap | expand |
Really sorry about that, my connection is weird this morning, I'll retry tomorrow. Sorry again, Alex On 6/19/19 1:42 AM, Alexandre Ghiti wrote: > In case of mmap failure in top-down mode, there is no need to go through > the whole address space again for the bottom-up fallback: the goal of this > fallback is to find, as a last resort, space between the top-down mmap base > and the stack, which is the only place not covered by the top-down mmap. > > Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> > --- > arch/s390/mm/mmap.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c > index cbc718ba6d78..4a222969843b 100644 > --- a/arch/s390/mm/mmap.c > +++ b/arch/s390/mm/mmap.c > @@ -166,7 +166,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > if (addr & ~PAGE_MASK) { > VM_BUG_ON(addr != -ENOMEM); > info.flags = 0; > - info.low_limit = TASK_UNMAPPED_BASE; > + info.low_limit = mm->mmap_base; > info.high_limit = TASK_SIZE; > addr = vm_unmapped_area(&info); > if (addr & ~PAGE_MASK)
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index cbc718ba6d78..4a222969843b 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -166,7 +166,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, if (addr & ~PAGE_MASK) { VM_BUG_ON(addr != -ENOMEM); info.flags = 0; - info.low_limit = TASK_UNMAPPED_BASE; + info.low_limit = mm->mmap_base; info.high_limit = TASK_SIZE; addr = vm_unmapped_area(&info); if (addr & ~PAGE_MASK)
In case of mmap failure in top-down mode, there is no need to go through the whole address space again for the bottom-up fallback: the goal of this fallback is to find, as a last resort, space between the top-down mmap base and the stack, which is the only place not covered by the top-down mmap. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> --- arch/s390/mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)