[PATCH 1/2] memtest: fix 4GB overflow fail

[Sascha Hauer]

On Mon, Jan 26, 2015 at 02:09:03PM +0300, Dmitry Lavnikevich wrote:
> On 26/01/15 12:09, Sascha Hauer wrote:
> >(Adding Alexander Aring)
> >@@ -107,8 +106,8 @@ static int request_memtest_regions(struct list_head *list)
> >  		r = list_last_entry(&bank->res->children,
> >  				     struct resource, sibling);
> >  		start = PAGE_ALIGN(r->end);
> still here we have overflow.
> Last region (stack) on 4GB systems ends on 0xfffffff7. So aligned
> up, start=0x00000000.
> After that
> >-		end = PAGE_ALIGN_DOWN(bank->res->end) - 1;
> >-		size = end - start + 1;
> >+		end = bank->res->end;
> >+		size = PAGE_ALIGN_DOWN(end - start + 1);
> >  		if (start < end) {
> This check detects that there are some space after last region
> (start=0x00000000) till end of bank (0xffffffff) and then
> >  			ret = alloc_memtest_region(list, start, size);
> >  			if (ret < 0)
> fails to allocate region from 0x00000000 for size 0x00000000.

Ok, so your original patch is still necessary. I applied both my patch
and yours to -next.

Sascha

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