Messages in this thread | | | Subject | Re: [PATCH RESEND 0/8] Fix mmap base in bottom-up mmap | From | Alexandre Ghiti <> | Date | Tue, 30 Jul 2019 08:12:20 +0200 |
| |
On 6/20/19 7:03 AM, Alexandre Ghiti wrote: > 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(-) >
Hi everyone,
This is just a preparatory series for the merging of x86 mmap top-down functions with the generic ones (those should get into v5.3), if you could take some time to take a look, that would be great :)
Thanks,
Alex
| |