From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Tue, 18 Jan 2022 08:48:36 +0100 Subject: [OpenRISC] architectures that still need to remove set_fs() Message-ID: <20220118074836.GA20994@lst.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: openrisc@lists.librecores.org Hi all, you are in this list because your architecture still implements and uses address space overrides using set_fs(), which are deprecated and have been removed from all mainstream architecture ports. To help cleanup the core kernel it would be great to make progress on removing set_fs entirely. The following steps are required: (1) implement the __get_kernel_nofault and __put_kernel_nofault helper to access kernel memory without page faults, replacing the get/put_user under set_fs(KERNEL_DS) abuse. Mips has a good example for a trivial implementation for architectures that use a common address space in commit 04324f44cb69 (2) remove any architecture specific use of such constructs. This only affects ia64 and sh. (3) stop selecting the SET_FS and remove all the set_fs-related infrastructure. The above mips commit is a good guide once again. Thanks!