https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 48778464bb7d346b47157d21ffde2af6b2d39110 authored by Linus Torvalds on 21 June 2020, 22:45:29 UTC
Linux 5.8-rc2
Linux 5.8-rc2
Tip revision: 4877846
physaddr.c
// 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/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;
}
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);
}
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);