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ARC: mm: Use virt_to_pfn() for addr >> PAGE_SHIFT pattern

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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta
2015-12-18 13:57:41 +05:30
parent 0b291635fc
commit c2ff5cf273
2 changed files with 11 additions and 17 deletions
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19
arch/arc/include/asm/page.h
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@@ -10,7 +10,6 @@
#include <uapi/asm/page.h>
#ifndef __ASSEMBLY__
#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
@@ -76,30 +75,26 @@ typedef unsigned long pgprot_t;
typedef pte_t * pgtable_t;
#define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
#define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_LINK_BASE)
#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
/*
* __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
*
* These macros have historically been misnamed
* virt here means link-address/program-address as embedded in object code.
* So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
* 128th page, and virt_to_page( ) will return the struct page corresp to it.
* mem_map[ ] is an array of struct page for each page frame in the system
*
* Independent of where linux is linked at, link-addr = physical address
* So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
* would have been wrong in case kernel is not at 0x8zs
* And for ARC, link-addr = physical address
*/
#define __pa(vaddr) ((unsigned long)vaddr)
#define __va(paddr) ((void *)((unsigned long)(paddr)))
#define virt_to_page(kaddr) \
(mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
(mem_map + virt_to_pfn((kaddr) - CONFIG_LINUX_LINK_BASE))
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
/* Default Permissions for stack/heaps pages (Non Executable) */
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)