Messages in this thread Patch in this message | | | Date | Fri, 17 Jul 2015 01:14:05 +0200 | From | Oleg Nesterov <> | Subject | [PATCH] mm-move-mremap-from-file_operations-to-vm_operations_struct-fix |
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fs/aio.c can't be compiled if CONFIG_MMU=n, filemap_page_mkwrite() is not defined in this case. Add yet another "must not be called" helper into nommu.c to make the linker happy.
I still think this is pointless, afaics sys_io_setup() simply can't succeed if CONFIG_MMU=n. Instead we should make CONFIG_AIO depend on CONFIG_MMU.
Reported-by: Fengguang Wu <fengguang.wu@intel.com> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Oleg Nesterov <oleg@redhat.com> --- mm/nommu.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/mm/nommu.c b/mm/nommu.c index e3026fd..979afad 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -2008,6 +2008,12 @@ void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf) } EXPORT_SYMBOL(filemap_map_pages); +int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + BUG(); + return 0; +} + static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) { -- 1.5.5.1
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