Note(1), this is called with mm->page_table_lock held.
Note, this is called with pte lock held.
void flush_cache_page(struct vm_area_struct *vma, unsigned long eaddr, unsigned long pfn){	/* Invalidate any entries in either cache for the vma within the user	   address space vma->vm_mm for the page starting at virtual address	   'eaddr'.   This seems to be used primarily in breaking COW.  Note,	   the I-cache must be searched too in case the page in question is	   both writable and being executed from (e.g. stack trampolines.)	   Note(1), this is called with mm->page_table_lock held.	   */	sh64_dcache_purge_phy_page(pfn << PAGE_SHIFT);	if (vma->vm_flags & VM_EXEC) {		sh64_icache_inv_user_page(vma, eaddr);	}}