Messages in this thread Patch in this message | | | From | stefani@seibold ... | Subject | [PATCH 4/6] Add new base function _install_special_mapping() to mmap.c | Date | Tue, 18 Dec 2012 10:40:54 +0100 |
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From: Stefani Seibold <stefani@seibold.net>
The _install_special_mapping() is the new base function for install_special_mapping(). This function will return a pointer to the vma which was created or a error code in an ERR_PTR()
The install_special_mapping() will unscramble this to the old behaviour, returning an int.
This new function will be needed by the X86_64/IA32_EMULATION to map the hpet into the 32 bit address space. This will be done with io_remap_pfn_range() which requieres a vm_area_struct.
Signed-off-by: Stefani Seibold <stefani@seibold.net> --- include/linux/mm.h | 3 +++ mm/mmap.c | 20 ++++++++++++++++---- 2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h index bcaab4e..82a992b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1435,6 +1435,9 @@ extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); 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); extern int install_special_mapping(struct mm_struct *mm, unsigned long addr, unsigned long len, unsigned long flags, struct page **pages); diff --git a/mm/mmap.c b/mm/mmap.c index 9a796c4..dd85d21 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2515,7 +2515,7 @@ static const struct vm_operations_struct special_mapping_vmops = { * The array pointer and the pages it points to are assumed to stay alive * for as long as this mapping might exist. */ -int install_special_mapping(struct mm_struct *mm, +struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, unsigned long addr, unsigned long len, unsigned long vm_flags, struct page **pages) { @@ -2524,7 +2524,7 @@ int install_special_mapping(struct mm_struct *mm, vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (unlikely(vma == NULL)) - return -ENOMEM; + return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&vma->anon_vma_chain); vma->vm_mm = mm; @@ -2545,11 +2545,23 @@ int install_special_mapping(struct mm_struct *mm, perf_event_mmap(vma); - return 0; + return vma; out: kmem_cache_free(vm_area_cachep, vma); - return ret; + return ERR_PTR(ret); +} + +int install_special_mapping(struct mm_struct *mm, + unsigned long addr, unsigned long len, + unsigned long vm_flags, struct page **pages) +{ + struct vm_area_struct *vma = _install_special_mapping(mm, + addr, len, vm_flags, pages); + + if (IS_ERR(vma)) + return PTR_ERR(vma); + return 0; } static DEFINE_MUTEX(mm_all_locks_mutex); -- 1.8.0
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