Hi all, this series removes the last set_fs() used to force a kernel address space for the uaccess code in the kernel read/write/splice code, and then stops implementing the address space overrides entirely for x86 and powerpc. [Note to Linus: I'd like to get this into linux-next rather earlier than later. Do you think it is ok to add this tree to linux-next?] The file system part has been posted a few times, and the read/write side has been pretty much unchanced. For splice this series drops the conversion of the seq_file and sysctl code to the iter ops, and thus loses the splice support for them. The reasons for that is that it caused a lot of churn for not much use - splice for these small files really isn't much of a win, even if existing userspace uses it. All callers I found do the proper fallback, but if this turns out to be an issue the conversion can be resurrected. Besides x86 and powerpc I plan to eventually convert all other architectures, although this will be a slow process, starting with the easier ones once the infrastructure is merged. The process to convert architectures is roughtly: (1) ensure there is no set_fs(KERNEL_DS) left in arch specific code (2) implement __get_kernel_nofault and __put_kernel_nofault (3) remove the arch specific address limitation functionality Changes since v2: - add back the patch to support splice through read_iter/write iter on /proc/sys/* - entirely remove the tests that depend on set_fs. Note that for lkdtm the maintainer (Kees) disagrees with this request from Linus - fix a wrong check in the powerpc access_ok, and drop a few spurious cleanups there Changes since v1: - drop the patch to remove the non-iter ops for /dev/zero and /dev/null as they caused a performance regression - don't enable user access in __get_kernel on powerpc - xfail the set_fs() based lkdtm tests Diffstat:
