From: Alexandre Ghiti <alex@ghiti.fr>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "James E . J . Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>,
"David S . Miller" <davem@davemloft.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H . Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
sparclinux@vger.kernel.org, linux-mm@kvack.org,
Alexandre Ghiti <alex@ghiti.fr>
Subject: [PATCH RESEND 0/8] Fix mmap base in bottom-up mmap
Date: Wed, 19 Jun 2019 01:42:16 -0400 [thread overview]
Message-ID: <20190619054224.5983-1-alex@ghiti.fr> (raw)
This series fixes the fallback of the top-down mmap: in case of
failure, a bottom-up scheme can be tried as a last resort between
the top-down mmap base and the stack, hoping for a large unused stack
limit.
Lots of architectures and even mm code start this fallback
at TASK_UNMAPPED_BASE, which is useless since the top-down scheme
already failed on the whole address space: instead, simply use
mmap_base.
Along the way, it allows to get rid of of mmap_legacy_base and
mmap_compat_legacy_base from mm_struct.
Note that arm and mips already implement this behaviour.
Alexandre Ghiti (8):
s390: Start fallback of top-down mmap at mm->mmap_base
sh: Start fallback of top-down mmap at mm->mmap_base
sparc: Start fallback of top-down mmap at mm->mmap_base
x86, hugetlbpage: Start fallback of top-down mmap at mm->mmap_base
mm: Start fallback top-down mmap at mm->mmap_base
parisc: Use mmap_base, not mmap_legacy_base, as low_limit for
bottom-up mmap
x86: Use mmap_*base, not mmap_*legacy_base, as low_limit for bottom-up
mmap
mm: Remove mmap_legacy_base and mmap_compat_legacy_code fields from
mm_struct
arch/parisc/kernel/sys_parisc.c | 8 +++-----
arch/s390/mm/mmap.c | 2 +-
arch/sh/mm/mmap.c | 2 +-
arch/sparc/kernel/sys_sparc_64.c | 2 +-
arch/sparc/mm/hugetlbpage.c | 2 +-
arch/x86/include/asm/elf.h | 2 +-
arch/x86/kernel/sys_x86_64.c | 4 ++--
arch/x86/mm/hugetlbpage.c | 7 ++++---
arch/x86/mm/mmap.c | 20 +++++++++-----------
include/linux/mm_types.h | 2 --
mm/debug.c | 4 ++--
mm/mmap.c | 2 +-
12 files changed, 26 insertions(+), 31 deletions(-)
--
2.20.1
next reply other threads:[~2019-06-19 5:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-19 5:42 Alexandre Ghiti [this message]
2019-06-19 5:42 ` [PATCH RESEND 1/8] s390: Start fallback of top-down mmap at mm->mmap_base Alexandre Ghiti
2019-06-19 5:54 ` Alex Ghiti
-- strict thread matches above, loose matches on Subject: below --
2019-06-20 5:03 [PATCH RESEND 0/8] Fix mmap base in bottom-up mmap Alexandre Ghiti
2019-07-30 6:12 ` Alexandre Ghiti
2019-08-26 7:34 ` Alexandre Ghiti
2019-08-26 22:37 ` Helge Deller
2019-08-28 4:53 ` Alex Ghiti
2019-06-19 5:38 Alexandre Ghiti
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