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Date: Wed, 19 Jun 2019 01:54:20 -0400 From: Alex Ghiti <alex@...ti.fr> To: Alexandre Ghiti <alex@...ti.fr> Cc: "James E . J . Bottomley" <james.bottomley@...senpartnership.com>, Helge Deller <deller@....de>, Heiko Carstens <heiko.carstens@...ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ibm.com>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Rich Felker <dalias@...c.org>, "David S . Miller" <davem@...emloft.net>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org, Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org, linux-sh@...r.kernel.org, sparclinux@...r.kernel.org, linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH RESEND 1/8] s390: Start fallback of top-down mmap at mm->mmap_base 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@...ti.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)
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