Release 4.11 arch/arm/mm/physaddr.c

#include <linux/bug.h>
#include <linux/export.h>
#include <linux/types.h>
#include <linux/mmdebug.h>
#include <linux/mm.h>

#include <asm/sections.h>
#include <asm/memory.h>
#include <asm/fixmap.h>
#include <asm/dma.h>

#include "mm.h"



static inline bool __virt_addr_valid(unsigned long x)
{
	/*
         * high_memory does not get immediately defined, and there
         * are early callers of __pa() against PAGE_OFFSET
         */
	if (!high_memory && x >= PAGE_OFFSET)
		return true;

	if (high_memory && x >= PAGE_OFFSET && x < (unsigned long)high_memory)
		return true;

	/*
         * MAX_DMA_ADDRESS is a virtual address that may not correspond to an
         * actual physical address. Enough code relies on __pa(MAX_DMA_ADDRESS)
         * that we just need to work around it and always return true.
         */
	if (x == MAX_DMA_ADDRESS)
		return true;

	return false;
}

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phys_addr_t __virt_to_phys(unsigned long x)
{
	WARN(!__virt_addr_valid(x),
	     "virt_to_phys used for non-linear address: %pK (%pS)\n",
	     (void *)x, (void *)x);

	return __virt_to_phys_nodebug(x);
}
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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);
}
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EXPORT_SYMBOL(__phys_addr_symbol);
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Directory: arch/arm/mm

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