NOMMU: implement access_remote_vm
Recent vm changes brought in a new function which the core procfs code utilizes. So implement it for nommu systems too to avoid link failures. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Simon Horman <horms@verge.net.au> Tested-by: Ithamar Adema <ithamar.adema@team-embedded.nl> Acked-by: Greg Ungerer <gerg@uclinux.org>
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mm/nommu.c
52
mm/nommu.c
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@ -1971,21 +1971,10 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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}
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EXPORT_SYMBOL(filemap_fault);
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/*
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* Access another process' address space.
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* - source/target buffer must be kernel space
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*/
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int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
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static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
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unsigned long addr, void *buf, int len, int write)
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{
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struct vm_area_struct *vma;
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struct mm_struct *mm;
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if (addr + len < addr)
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return 0;
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mm = get_task_mm(tsk);
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if (!mm)
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return 0;
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down_read(&mm->mmap_sem);
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@ -2010,6 +1999,43 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
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}
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up_read(&mm->mmap_sem);
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return len;
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}
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/**
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* @access_remote_vm - access another process' address space
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* @mm: the mm_struct of the target address space
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* @addr: start address to access
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* @buf: source or destination buffer
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* @len: number of bytes to transfer
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* @write: whether the access is a write
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*
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* The caller must hold a reference on @mm.
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*/
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int access_remote_vm(struct mm_struct *mm, unsigned long addr,
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void *buf, int len, int write)
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{
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return __access_remote_vm(NULL, mm, addr, buf, len, write);
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}
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/*
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* Access another process' address space.
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* - source/target buffer must be kernel space
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*/
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int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
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{
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struct mm_struct *mm;
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if (addr + len < addr)
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return 0;
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mm = get_task_mm(tsk);
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if (!mm)
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return 0;
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len = __access_remote_vm(tsk, mm, addr, buf, len, write);
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mmput(mm);
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return len;
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}
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