Messages in this thread | | | Date | Tue, 11 Mar 2008 21:29:11 +0900 | From | "Akinobu Mita" <> | Subject | Re: [PATCH 4/5] shmem: use call_once() |
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2008/3/11, Hugh Dickins <hugh@veritas.com>: > On Tue, 11 Mar 2008, Akinobu Mita wrote: > > This patch defers mounting tmpfs till shmem_file_setup() is > > called first time by using call_once(). > > > Please explain why we might need this patch: is something changing > elsewhere? Or are you misled by that "module_init(init_tmpfs)" > into thinking that mm/shmem.c is sometimes built modular? >
If no processes call shmem_file_setup() (via shm_get(2)), it is unnecessary to do vfs_kern_mount(&tmpfs_fs_type, ...) unconditionary in boot-time. So I thought it is suitable example to demonstrate how to use "call_once()" in this patch set.
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