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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-07-01 11:46:30 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-07-01 11:46:30 -0700 |
commit | 5a475ce4692f668b2615ae4ea1365c7c2d93f1dd (patch) | |
tree | 0349690bce5fe2396a3788bb1a4084ffd87ee308 /mm/nommu.c | |
parent | d960eea974f5e500c0dcb95a934239cc1f481cfd (diff) | |
parent | 1c6a307a54668eda556f499c94e75086aaf8f80f (diff) | |
download | kernel_samsung_espresso10-5a475ce4692f668b2615ae4ea1365c7c2d93f1dd.zip kernel_samsung_espresso10-5a475ce4692f668b2615ae4ea1365c7c2d93f1dd.tar.gz kernel_samsung_espresso10-5a475ce4692f668b2615ae4ea1365c7c2d93f1dd.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
sh: LCDC dcache flush for deferred io
sh: Fix compiler error and include the definition of IS_ERR_VALUE
sh: re-add LCDC fbdev support to the Migo-R defconfig
sh: fix se7724 ceu names
sh: ms7724se: Enable sh_eth in defconfig.
arch/sh/boards/mach-se/7206/io.c: Remove unnecessary semicolons
sh: ms7724se: Add sh_eth support
nommu: provide follow_pfn().
sh: Kill off unused DEBUG_BOOTMEM symbol.
perf_counter tools: add cpu_relax()/rmb() definitions for sh.
sh64: Hook up page fault events for software perf counters.
sh: Hook up page fault events for software perf counters.
sh: make set_perf_counter_pending() static inline.
clocksource: sh_tmu: Make undefined TCOR behaviour less undefined.
Diffstat (limited to 'mm/nommu.c')
-rw-r--r-- | mm/nommu.c | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -238,6 +238,27 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, } EXPORT_SYMBOL(get_user_pages); +/** + * follow_pfn - look up PFN at a user virtual address + * @vma: memory mapping + * @address: user virtual address + * @pfn: location to store found PFN + * + * Only IO mappings and raw PFN mappings are allowed. + * + * Returns zero and the pfn at @pfn on success, -ve otherwise. + */ +int follow_pfn(struct vm_area_struct *vma, unsigned long address, + unsigned long *pfn) +{ + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) + return -EINVAL; + + *pfn = address >> PAGE_SHIFT; + return 0; +} +EXPORT_SYMBOL(follow_pfn); + DEFINE_RWLOCK(vmlist_lock); struct vm_struct *vmlist; |