text: // SPDX-License-Identifier: GPL-2.0
  #include <linux/bug.h>
  #include <linux/export.h>
  #include <linux/types.h>
  #include <linux/mmdebug.h>
  #include <linux/mm.h>
  
  #include <asm/memory.h>
  
  phys_addr_t __virt_to_phys(unsigned long x)
  {
  	WARN(!__is_lm_address(__tag_reset(x)),
  	     "virt_to_phys used for non-linear address: %pK (%pS)\n",
  	      (void *)x,
  	      (void *)x);
  
  	return __virt_to_phys_nodebug(x);
  }
  EXPORT_SYMBOL(__virt_to_phys);
  
  phys_addr_t __phys_addr_symbol(unsigned long x)
  {
  	/*
  	 * This is bounds checking against the kernel image only.
  	 * __pa_symbol should only be used on kernel symbol addresses.
  	 */
  	VIRTUAL_BUG_ON(x < (unsigned long) KERNEL_START ||
  		       x > (unsigned long) KERNEL_END);
  	return __pa_symbol_nodebug(x);
  }
  EXPORT_SYMBOL(__phys_addr_symbol);
  