Talos™ II Linux sources for OpenBMC https://git.raptorcs.com/git/talos-obmc-linux/atom?h=dev-5.0 2019-01-04T21:13:47+00:00 2019-01-04T21:13:47+00:00 Joel Fernandes (Google) joel@joelfernandes.org 2019-01-03T23:28:34+00:00 urn:sha1:4cf58924951ef80eec636b863e7a53973c44261a Patch series "Add support for fast mremap". This series speeds up the mremap(2) syscall by copying page tables at the PMD level even for non-THP systems. There is concern that the extra 'address' argument that mremap passes to pte_alloc may do something subtle architecture related in the future that may make the scheme not work. Also we find that there is no point in passing the 'address' to pte_alloc since its unused. This patch therefore removes this argument tree-wide resulting in a nice negative diff as well. Also ensuring along the way that the enabled architectures do not do anything funky with the 'address' argument that goes unnoticed by the optimization. Build and boot tested on x86-64. Build tested on arm64. The config enablement patch for arm64 will be posted in the future after more testing. The changes were obtained by applying the following Coccinelle script. (thanks Julia for answering all Coccinelle questions!). Following fix ups were done manually: * Removal of address argument from pte_fragment_alloc * Removal of pte_alloc_one_fast definitions from m68k and microblaze. // Options: --include-headers --no-includes // Note: I split the 'identifier fn' line, so if you are manually // running it, please unsplit it so it runs for you. virtual patch @pte_alloc_func_def depends on patch exists@ identifier E2; identifier fn =~ "^(__pte_alloc|pte_alloc_one|pte_alloc|__pte_alloc_kernel|pte_alloc_one_kernel)$"; type T2; @@ fn(... - , T2 E2 ) { ... } @pte_alloc_func_proto_noarg depends on patch exists@ type T1, T2, T3, T4; identifier fn =~ "^(__pte_alloc|pte_alloc_one|pte_alloc|__pte_alloc_kernel|pte_alloc_one_kernel)$"; @@ ( - T3 fn(T1, T2); + T3 fn(T1); | - T3 fn(T1, T2, T4); + T3 fn(T1, T2); ) @pte_alloc_func_proto depends on patch exists@ identifier E1, E2, E4; type T1, T2, T3, T4; identifier fn =~ "^(__pte_alloc|pte_alloc_one|pte_alloc|__pte_alloc_kernel|pte_alloc_one_kernel)$"; @@ ( - T3 fn(T1 E1, T2 E2); + T3 fn(T1 E1); | - T3 fn(T1 E1, T2 E2, T4 E4); + T3 fn(T1 E1, T2 E2); ) @pte_alloc_func_call depends on patch exists@ expression E2; identifier fn =~ "^(__pte_alloc|pte_alloc_one|pte_alloc|__pte_alloc_kernel|pte_alloc_one_kernel)$"; @@ fn(... -, E2 ) @pte_alloc_macro depends on patch exists@ identifier fn =~ "^(__pte_alloc|pte_alloc_one|pte_alloc|__pte_alloc_kernel|pte_alloc_one_kernel)$"; identifier a, b, c; expression e; position p; @@ ( - #define fn(a, b, c) e + #define fn(a, b) e | - #define fn(a, b) e + #define fn(a) e ) Link: http://lkml.kernel.org/r/20181108181201.88826-2-joelaf@google.com Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Suggested-by: Kirill A. Shutemov <kirill@shutemov.name> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Cc: Michal Hocko <mhocko@kernel.org> Cc: Julia Lawall <Julia.Lawall@lip6.fr> Cc: Kirill A. Shutemov <kirill@shutemov.name> Cc: William Kucharski <william.kucharski@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2018-12-27T21:48:35+00:00 Anton Ivanov anton.ivanov@cambridgegreys.com 2018-11-13T15:08:02+00:00 urn:sha1:940b241d9050fc354f68c182e99fc3da1ff36bc0 reenable_fd has been a NOP since the introduction of the EPOLL based interrupt controller. reenable_channel() is no longer needed as the flow control is now handled via the write IRQs on the channel. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at> 2018-12-27T21:48:34+00:00 Masahiro Yamada yamada.masahiro@socionext.com 2018-12-16T14:37:06+00:00 urn:sha1:efe5f5be1e40be76d25da69f76f0b68dc6bafb8e This commit removes redundant generic-y defines in arch/um/include/asm/Kbuild. It is redundant to define generic-y when arch-specific implementation exists in arch/$(ARCH)/include/asm/*.h Remove the following generic-y: hardirq.h io.h Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Richard Weinberger <richard@nod.at> 2018-12-27T21:48:34+00:00 Anton Ivanov anton.ivanov@cambridgegreys.com 2018-12-05T12:37:41+00:00 urn:sha1:8892d8545f2d0342b9c550defbfb165db237044b Changing protection is a very high cost operation in UML because in addition to an extra syscall it also interrupts mmap merge sequences generated by the tlb. While the condition is not particularly common it is worth avoiding. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at> 2018-12-27T21:48:20+00:00 Anton Ivanov anton.ivanov@cambridgegreys.com 2018-11-14T18:41:09+00:00 urn:sha1:50109b5a03b4024eb6b8df3ab8f427625f54fe92 Support for DISCARD and WRITE_ZEROES in the ubd driver using fallocate. DISCARD is enabled by default and can be disabled using a new UBD command line flag. If the underlying fs on which the UBD image is stored does not support DISCARD the support for both DISCARD and WRITE_ZEROES is turned off. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at> 2018-10-31T22:46:16+00:00 Linus Torvalds torvalds@linux-foundation.org 2018-10-31T22:46:16+00:00 urn:sha1:9bb9d4fdce9e6b351b7b905f150745a0fccccc06 Pull UML updates from Richard Weinberger: - removal of old and dead code - a bug fix for our tty driver - other minor cleanups across the code base * 'for-linus-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: Make line/tty semantics use true write IRQ um: trap: fix spelling mistake, EACCESS -> EACCES um: Don't hardcode path as it is architecture dependent um: NULL check before kfree is not needed um: remove unused AIO code um: Give start_idle_thread() a return code um: Remove update_debugregs() um: Drop own definition of PTRACE_SYSEMU/_SINGLESTEP 2018-10-29T21:23:12+00:00 Christoph Hellwig hch@lst.de 2018-07-11T07:32:39+00:00 urn:sha1:369cca266860db8222c991fced8caa42c3e5b05f Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Richard Weinberger <richard@nod.at> 2018-10-11T03:40:21+00:00 Kees Cook keescook@chromium.org 2018-10-11T00:18:22+00:00 urn:sha1:3ac946d12e344a48c1192ef8910c6095a0d6a8ac Since the struct lsm_info table is not an initcall, we can just move it into INIT_DATA like all the other tables. Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Casey Schaufler <casey@schaufler-ca.com> Reviewed-by: John Johansen <john.johansen@canonical.com> Reviewed-by: James Morris <james.morris@microsoft.com> Signed-off-by: James Morris <james.morris@microsoft.com> 2018-06-15T21:50:51+00:00 Linus Torvalds torvalds@linux-foundation.org 2018-06-15T21:50:51+00:00 urn:sha1:8d1e5133bf260aabdf2cc6facd4a8e696414d16a Pull uml updates from Richard Weinberger: "Minor updates for UML: - fixes for our new vector network driver by Anton - initcall cleanup by Alexander - We have a new mailinglist, sourceforge.net sucks" * 'for-linus-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: Fix raw interface options um: Fix initialization of vector queues um: remove uml initcalls um: Update mailing list address 2018-06-10T20:49:14+00:00 Alexander Pateenok pateenoc@gmail.com 2018-04-23T18:20:17+00:00 urn:sha1:cca76c1ad61d08097af5a691195f9a42d72e978f __uml_initcall() is not used and .uml.initcall.init section is empty: $ grep -r '__uml_initcall(' arch/um/include/shared/init.h:#define __uml_initcall(fn) \ $ readelf -s ../umobj/linux | grep __uml_initcall 23214: 00000000603b75d8 0 NOTYPE GLOBAL DEFAULT 32 __uml_initcall_start 25337: 00000000603b75d8 0 NOTYPE GLOBAL DEFAULT 32 __uml_initcall_end So it is unnecessary. Signed-off-by: Alexander Pateenok <pateenoc@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>