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| author | Andy Lutomirski <luto@amacapital.net> | 2014-05-19 15:58:33 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-05-20 11:38:42 -0700 |
| commit | a62c34bd2a8a3f159945becd57401e478818d51c (patch) | |
| tree | 8721aca251b468606e52376fc811dd0c8beeaeb8 /include | |
| parent | 78d683e838a60ec4ba4591cca4364cba84a9e626 (diff) | |
| download | linux-0-day-a62c34bd2a8a3f159945becd57401e478818d51c.tar.gz linux-0-day-a62c34bd2a8a3f159945becd57401e478818d51c.tar.xz | |
x86, mm: Improve _install_special_mapping and fix x86 vdso naming
Using arch_vma_name to give special mappings a name is awkward. x86
currently implements it by comparing the start address of the vma to
the expected address of the vdso. This requires tracking the start
address of special mappings and is probably buggy if a special vma
is split or moved.
Improve _install_special_mapping to just name the vma directly. Use
it to give the x86 vvar area a name, which should make CRIU's life
easier.
As a side effect, the vvar area will show up in core dumps. This
could be considered weird and is fixable.
[hpa: I say we accept this as-is but be prepared to deal with knocking
out the vvars from core dumps if this becomes a problem.]
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/276b39b6b645fb11e345457b503f17b83c2c6fd0.1400538962.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm.h | 4 | ||||
| -rw-r--r-- | include/linux/mm_types.h | 6 |
2 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 63f8d4efe3030..05aab09803e6a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1782,7 +1782,9 @@ extern struct file *get_mm_exe_file(struct mm_struct *mm); extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, unsigned long addr, unsigned long len, - unsigned long flags, struct page **pages); + unsigned long flags, + const struct vm_special_mapping *spec); +/* This is an obsolete alternative to _install_special_mapping. */ extern int install_special_mapping(struct mm_struct *mm, unsigned long addr, unsigned long len, unsigned long flags, struct page **pages); diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 8967e20cbe57a..22c6f4e16d106 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -510,4 +510,10 @@ static inline void clear_tlb_flush_pending(struct mm_struct *mm) } #endif +struct vm_special_mapping +{ + const char *name; + struct page **pages; +}; + #endif /* _LINUX_MM_TYPES_H */ |