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Commit f55f199b authored by Mike Frysinger's avatar Mike Frysinger Committed by David Howells
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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: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Tested-by: default avatarSimon Horman <horms@verge.net.au>
Tested-by: default avatarIthamar Adema <ithamar.adema@team-embedded.nl>
Acked-by: default avatarGreg Ungerer <gerg@uclinux.org>
parent b554cb42

mm/nommu.c

+39 −13
Original line number Diff line number Diff line
@@ -1971,21 +1971,10 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 
}

EXPORT_SYMBOL(filemap_fault);



/*

 * Access another process' address space.

 * - source/target buffer must be kernel space

 */

int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)

static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,

		unsigned long addr, void *buf, int len, int write)

{

	struct vm_area_struct *vma;

	struct mm_struct *mm;



	if (addr + len < addr)

		return 0;



	mm = get_task_mm(tsk);

	if (!mm)

		return 0;



	down_read(&mm->mmap_sem);
@@ -2010,6 +1999,43 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in 
	}



	up_read(&mm->mmap_sem);



	return len;

}



/**

 * @access_remote_vm - access another process' address space

 * @mm:		the mm_struct of the target address space

 * @addr:	start address to access

 * @buf:	source or destination buffer

 * @len:	number of bytes to transfer

 * @write:	whether the access is a write

 *

 * The caller must hold a reference on @mm.

 */

int access_remote_vm(struct mm_struct *mm, unsigned long addr,

		void *buf, int len, int write)

{

	return __access_remote_vm(NULL, mm, addr, buf, len, write);

}



/*

 * Access another process' address space.

 * - source/target buffer must be kernel space

 */

int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)

{

	struct mm_struct *mm;



	if (addr + len < addr)

		return 0;



	mm = get_task_mm(tsk);

	if (!mm)

		return 0;



	len = __access_remote_vm(tsk, mm, addr, buf, len, write);



	mmput(mm);

	return len;

}