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Groups > linux.kernel > #1608248
| From | "Kirill A. Shutemov" <kirill@shutemov.name> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits |
| Date | 2017-03-24 10:10 +0100 |
| Message-ID | <totom-7Is-13@gated-at.bofh.it> (permalink) |
| References | <tkrbr-4j8-5@gated-at.bofh.it> <tkrbr-4j8-7@gated-at.bofh.it> <tmXTz-8lw-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Mar 20, 2017 at 10:40:20AM +0530, Aneesh Kumar K.V wrote: > "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> writes: > @@ -168,6 +182,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > > unsigned long addr = addr0; > > struct vm_unmapped_area_info info; > > > > + addr = mpx_unmapped_area_check(addr, len, flags); > > + if (IS_ERR_VALUE(addr)) > > + return addr; > > + > > /* requested length too big for entire address space */ > > if (len > TASK_SIZE) > > return -ENOMEM; > > @@ -192,6 +210,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, > > info.length = len; > > info.low_limit = PAGE_SIZE; > > info.high_limit = mm->mmap_base; > > + > > + /* > > + * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area > > + * in the full address space. > > + */ > > + if (addr > DEFAULT_MAP_WINDOW) > > + info.high_limit += TASK_SIZE - DEFAULT_MAP_WINDOW; > > + > > Is this ok for 32 bit application ? DEFAULT_MAP_WINDOW is equal to TASK_SIZE on 32-bit, so it's nop and will be compile out. -- Kirill A. Shutemov
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Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-03-20 06:20 +0100
Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 10:10 +0100
Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-03-24 10:20 +0100
Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 10:40 +0100
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