Re: [PATCH RESEND 1/8] s390: Start fallback of top-down mmap at mm->mmap_base

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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@xxxxxxxx>
---
  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)



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