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authorRandy Dunlap <randy.dunlap@oracle.com>2007-10-17 02:31:29 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 11:43:07 -0400
commit8d63494f780a77f3edfe9b470d65b7f265ae8d5a (patch)
tree9804470c7e12e769ea79c328f0d6f4a37dd3f8ec /mm/fremap.c
parentf32143a2fedfa299d790ca96bff9b1d2e2d6996b (diff)
remap_file_pages: kernel-doc corrections
Fix kernel-doc for sys_remap_file_pages() and add info to the 'prot' NOTE. Rename __prot parameter to prot. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/fremap.c')
-rw-r--r--mm/fremap.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/mm/fremap.c b/mm/fremap.c
index 37a93f8f3ae..14bd3bf7826 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -97,26 +97,28 @@ static int populate_range(struct mm_struct *mm, struct vm_area_struct *vma,
97 97
98} 98}
99 99
100/*** 100/**
101 * sys_remap_file_pages - remap arbitrary pages of a shared backing store 101 * sys_remap_file_pages - remap arbitrary pages of an existing VM_SHARED vma
102 * file within an existing vma.
103 * @start: start of the remapped virtual memory range 102 * @start: start of the remapped virtual memory range
104 * @size: size of the remapped virtual memory range 103 * @size: size of the remapped virtual memory range
105 * @prot: new protection bits of the range 104 * @prot: new protection bits of the range (see NOTE)
106 * @pgoff: to be mapped page of the backing store file 105 * @pgoff: to-be-mapped page of the backing store file
107 * @flags: 0 or MAP_NONBLOCKED - the later will cause no IO. 106 * @flags: 0 or MAP_NONBLOCKED - the later will cause no IO.
108 * 107 *
109 * this syscall works purely via pagetables, so it's the most efficient 108 * sys_remap_file_pages remaps arbitrary pages of an existing VM_SHARED vma
109 * (shared backing store file).
110 *
111 * This syscall works purely via pagetables, so it's the most efficient
110 * way to map the same (large) file into a given virtual window. Unlike 112 * way to map the same (large) file into a given virtual window. Unlike
111 * mmap()/mremap() it does not create any new vmas. The new mappings are 113 * mmap()/mremap() it does not create any new vmas. The new mappings are
112 * also safe across swapout. 114 * also safe across swapout.
113 * 115 *
114 * NOTE: the 'prot' parameter right now is ignored, and the vma's default 116 * NOTE: the 'prot' parameter right now is ignored (but must be zero),
115 * protection is used. Arbitrary protections might be implemented in the 117 * and the vma's default protection is used. Arbitrary protections
116 * future. 118 * might be implemented in the future.
117 */ 119 */
118asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size, 120asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
119 unsigned long __prot, unsigned long pgoff, unsigned long flags) 121 unsigned long prot, unsigned long pgoff, unsigned long flags)
120{ 122{
121 struct mm_struct *mm = current->mm; 123 struct mm_struct *mm = current->mm;
122 struct address_space *mapping; 124 struct address_space *mapping;
@@ -125,7 +127,7 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
125 int err = -EINVAL; 127 int err = -EINVAL;
126 int has_write_lock = 0; 128 int has_write_lock = 0;
127 129
128 if (__prot) 130 if (prot)
129 return err; 131 return err;
130 /* 132 /*
131 * Sanitize the syscall parameters: 133 * Sanitize the syscall parameters: