1. 06 Apr, 2018 1 commit
    • Huang Ying's avatar
      mm: fix races between swapoff and flush dcache · cb9f753a
      Huang Ying authored
      Thanks to commit 4b3ef9da ("mm/swap: split swap cache into 64MB
      trunks"), after swapoff the address_space associated with the swap
      device will be freed.  So page_mapping() users which may touch the
      address_space need some kind of mechanism to prevent the address_space
      from being freed during accessing.
      The dcache flushing functions (flush_dcache_page(), etc) in architecture
      specific code may access the address_space of swap device for anonymous
      pages in swap cache via page_mapping() function.  But in some cases
      there are no mechanisms to prevent the swap device from being swapoff,
      for example,
        CPU1					CPU2
        __get_user_pages()			swapoff()
            mapping = page_mapping()
              ...				  exit_swap_address_space()
              ...				    kvfree(spaces)
      The address space may be accessed after being freed.
      But from cachetlb.txt and Russell King, flush_dcache_page() only care
      about file cache pages, for anonymous pages, flush_anon_page() should be
      used.  The implementation of flush_dcache_page() in all architectures
      follows this too.  They will check whether page_mapping() is NULL and
      whether mapping_mapped() is true to determine whether to flush the
      dcache immediately.  And they will use interval tree (mapping->i_mmap)
      to find all user space mappings.  While mapping_mapped() and
      mapping->i_mmap isn't used by anonymous pages in swap cache at all.
      So, to fix the race between swapoff and flush dcache, __page_mapping()
      is add to return the address_space for file cache pages and NULL
      otherwise.  All page_mapping() invoking in flush dcache functions are
      replaced with page_mapping_file().
      [akpm@linux-foundation.org: simplify page_mapping_file(), per Mike]
      Link: http://lkml.kernel.org/r/20180305083634.15174-1-ying.huang@intel.comSigned-off-by: default avatar"Huang, Ying" <ying.huang@intel.com>
      Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Mel Gorman <mgorman@techsingularity.net>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: Chen Liqin <liqin.linux@gmail.com>
      Cc: Russell King <linux@armlinux.org.uk>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
      Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Chris Zankel <chris@zankel.net>
      Cc: Vineet Gupta <vgupta@synopsys.com>
      Cc: Ley Foon Tan <lftan@altera.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
  2. 07 Feb, 2018 1 commit
    • Clement Courbet's avatar
      lib: optimize cpumask_next_and() · 0ade34c3
      Clement Courbet authored
      We've measured that we spend ~0.6% of sys cpu time in cpumask_next_and().
      It's essentially a joined iteration in search for a non-zero bit, which is
      currently implemented as a lookup join (find a nonzero bit on the lhs,
      lookup the rhs to see if it's set there).
      Implement a direct join (find a nonzero bit on the incrementally built
      join).  Also add generic bitmap benchmarks in the new `test_find_bit`
      module for new function (see `find_next_and_bit` in [2] and [3] below).
      For cpumask_next_and, direct benchmarking shows that it's 1.17x to 14x
      faster with a geometric mean of 2.1 on 32 CPUs [1].  No impact on memory
      usage.  Note that on Arm, the new pure-C implementation still outperforms
      the old one that uses a mix of C and asm (`find_next_bit`) [3].
      [1] Approximate benchmark code:
        unsigned long src1p[nr_cpumask_longs] = {pattern1};
        unsigned long src2p[nr_cpumask_longs] = {pattern2};
        for (/*a bunch of repetitions*/) {
          for (int n = -1; n <= nr_cpu_ids; ++n) {
            asm volatile("" : "+rm"(src1p)); // prevent any optimization
            asm volatile("" : "+rm"(src2p));
            unsigned long result = cpumask_next_and(n, src1p, src2p);
            asm volatile("" : "+rm"(result));
      pattern1    pattern2     time_before/time_after
      0x0000ffff  0x0000ffff   1.65
      0x0000ffff  0x00005555   2.24
      0x0000ffff  0x00001111   2.94
      0x0000ffff  0x00000000   14.0
      0x00005555  0x0000ffff   1.67
      0x00005555  0x00005555   1.71
      0x00005555  0x00001111   1.90
      0x00005555  0x00000000   6.58
      0x00001111  0x0000ffff   1.46
      0x00001111  0x00005555   1.49
      0x00001111  0x00001111   1.45
      0x00001111  0x00000000   3.10
      0x00000000  0x0000ffff   1.18
      0x00000000  0x00005555   1.18
      0x00000000  0x00001111   1.17
      0x00000000  0x00000000   1.25
                     geo.mean  2.06
      [2] test_find_next_bit, X86 (skylake)
       [ 3913.477422] Start testing find_bit() with random-filled bitmap
       [ 3913.477847] find_next_bit: 160868 cycles, 16484 iterations
       [ 3913.477933] find_next_zero_bit: 169542 cycles, 16285 iterations
       [ 3913.478036] find_last_bit: 201638 cycles, 16483 iterations
       [ 3913.480214] find_first_bit: 4353244 cycles, 16484 iterations
       [ 3913.480216] Start testing find_next_and_bit() with random-filled
       [ 3913.481074] find_next_and_bit: 89604 cycles, 8216 iterations
       [ 3913.481075] Start testing find_bit() with sparse bitmap
       [ 3913.481078] find_next_bit: 2536 cycles, 66 iterations
       [ 3913.481252] find_next_zero_bit: 344404 cycles, 32703 iterations
       [ 3913.481255] find_last_bit: 2006 cycles, 66 iterations
       [ 3913.481265] find_first_bit: 17488 cycles, 66 iterations
       [ 3913.481266] Start testing find_next_and_bit() with sparse bitmap
       [ 3913.481272] find_next_and_bit: 764 cycles, 1 iterations
      [3] test_find_next_bit, arm (v7 odroid XU3).
      [  267.206928] Start testing find_bit() with random-filled bitmap
      [  267.214752] find_next_bit: 4474 cycles, 16419 iterations
      [  267.221850] find_next_zero_bit: 5976 cycles, 16350 iterations
      [  267.229294] find_last_bit: 4209 cycles, 16419 iterations
      [  267.279131] find_first_bit: 1032991 cycles, 16420 iterations
      [  267.286265] Start testing find_next_and_bit() with random-filled
      [  267.302386] find_next_and_bit: 2290 cycles, 8140 iterations
      [  267.309422] Start testing find_bit() with sparse bitmap
      [  267.316054] find_next_bit: 191 cycles, 66 iterations
      [  267.322726] find_next_zero_bit: 8758 cycles, 32703 iterations
      [  267.329803] find_last_bit: 84 cycles, 66 iterations
      [  267.336169] find_first_bit: 4118 cycles, 66 iterations
      [  267.342627] Start testing find_next_and_bit() with sparse bitmap
      [  267.356919] find_next_and_bit: 91 cycles, 1 iterations
      [courbet@google.com: v6]
        Link: http://lkml.kernel.org/r/20171129095715.23430-1-courbet@google.com
      [geert@linux-m68k.org: m68k/bitops: always include <asm-generic/bitops/find.h>]
        Link: http://lkml.kernel.org/r/1512556816-28627-1-git-send-email-geert@linux-m68k.org
      Link: http://lkml.kernel.org/r/20171128131334.23491-1-courbet@google.comSigned-off-by: default avatarClement Courbet <courbet@google.com>
      Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
      Cc: Yury Norov <ynorov@caviumnetworks.com>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
  3. 15 Jan, 2018 1 commit
  4. 10 Jan, 2018 2 commits
  5. 09 Jan, 2018 1 commit
  6. 05 Jan, 2018 2 commits
  7. 03 Jan, 2018 1 commit
  8. 22 Dec, 2017 1 commit
    • Thomas Gleixner's avatar
      arch, mm: Allow arch_dup_mmap() to fail · c10e83f5
      Thomas Gleixner authored
      In order to sanitize the LDT initialization on x86 arch_dup_mmap() must be
      allowed to fail. Fix up all instances.
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Andy Lutomirsky <luto@kernel.org>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Borislav Petkov <bpetkov@suse.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: David Laight <David.Laight@aculab.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Eduardo Valentin <eduval@amazon.com>
      Cc: Greg KH <gregkh@linuxfoundation.org>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: aliguori@amazon.com
      Cc: dan.j.williams@intel.com
      Cc: hughd@google.com
      Cc: keescook@google.com
      Cc: kirill.shutemov@linux.intel.com
      Cc: linux-mm@kvack.org
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
  9. 05 Dec, 2017 1 commit
    • Hendrik Brueckner's avatar
      bpf: correct broken uapi for BPF_PROG_TYPE_PERF_EVENT program type · c895f6f7
      Hendrik Brueckner authored
      Commit 0515e599 ("bpf: introduce BPF_PROG_TYPE_PERF_EVENT
      program type") introduced the bpf_perf_event_data structure which
      exports the pt_regs structure.  This is OK for multiple architectures
      but fail for s390 and arm64 which do not export pt_regs.  Programs
      using them, for example, the bpf selftest fail to compile on these
      For s390, exporting the pt_regs is not an option because s390 wants
      to allow changes to it.  For arm64, there is a user_pt_regs structure
      that covers parts of the pt_regs structure for use by user space.
      To solve the broken uapi for s390 and arm64, introduce an abstract
      type for pt_regs and add an asm/bpf_perf_event.h file that concretes
      the type.  An asm-generic header file covers the architectures that
      export pt_regs today.
      The arch-specific enablement for s390 and arm64 follows in separate
      Reported-by: default avatarThomas Richter <tmricht@linux.vnet.ibm.com>
      Fixes: 0515e599 ("bpf: introduce BPF_PROG_TYPE_PERF_EVENT program type")
      Signed-off-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
      Reviewed-and-tested-by: default avatarThomas Richter <tmricht@linux.vnet.ibm.com>
      Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
      Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
  10. 16 Nov, 2017 2 commits
  11. 02 Nov, 2017 2 commits
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX license identifier to uapi header files with a license · e2be04c7
      Greg Kroah-Hartman authored
      Many user space API headers have licensing information, which is either
      incomplete, badly formatted or just a shorthand for referring to the
      license under which the file is supposed to be.  This makes it hard for
      compliance tools to determine the correct license.
      Update these files with an SPDX license identifier.  The identifier was
      chosen based on the license information in the file.
      GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license
      identifier with the added 'WITH Linux-syscall-note' exception, which is
      the officially assigned exception identifier for the kernel syscall
         NOTE! This copyright does *not* cover user programs that use kernel
         services by normal system calls - this is merely considered normal use
         of the kernel, and does *not* fall under the heading of "derived work".
      This exception makes it possible to include GPL headers into non GPL
      code, without confusing license compliance tools.
      Headers which have either explicit dual licensing or are just licensed
      under a non GPL license are updated with the corresponding SPDX
      identifier and the GPLv2 with syscall exception identifier.  The format
              ((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE)
      SPDX license identifiers are a legally binding shorthand, which can be
      used instead of the full boiler plate text.  The update does not remove
      existing license information as this has to be done on a case by case
      basis and the copyright holders might have to be consulted. This will
      happen in a separate step.
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.  See the previous patch in this series for the
      methodology of how this patch was researched.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      Many source files in the tree are missing licensing information, which
      makes it harder for compliance tools to determine the correct license.
      By default all files without license information are under the default
      license of the kernel, which is GPL version 2.
      Update the files which contain no license information with the 'GPL-2.0'
      SPDX license identifier.  The SPDX identifier is a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.
      How this work was done:
      Patches were generated and checked against linux-4.14-rc6 for a subset of
      the use cases:
       - file had no licensing information it it.
       - file was a */uapi/* one with no licensing information in it,
       - file was a */uapi/* one with existing licensing information,
      Further patches will be generated in subsequent months to fix up cases
      where non-standard license headers were used, and references to license
      had to be inferred by heuristics based on keywords.
      The analysis to determine which SPDX License Identifier to be applied to
      a file was done in a spreadsheet of side by side results from of the
      output of two independent scanners (ScanCode & Windriver) producing SPDX
      tag:value files created by Philippe Ombredanne.  Philippe prepared the
      base worksheet, and did an initial spot review of a few 1000 files.
      The 4.13 kernel was the starting point of the analysis with 60,537 files
      assessed.  Kate Stewart did a file by file comparison of the scanner
      results in the spreadsheet to determine which SPDX license identifier(s)
      to be applied to the file. She confirmed any determination that was not
      immediately clear with lawyers working with the Linux Foundation.
      Criteria used to select files for SPDX license identifier tagging was:
       - Files considered eligible had to be source code files.
       - Make and config files were included as candidates if they contained >5
         lines of source
       - File already had some variant of a license header in it (even if <5
      All documentation files were explicitly excluded.
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
         For non */uapi/* files that summary was:
         SPDX license identifier                            # files
         GPL-2.0                                              11139
         and resulted in the first patch in this series.
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
         SPDX license identifier                            # files
         GPL-2.0 WITH Linux-syscall-note                        930
         and resulted in the second patch in this series.
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
         SPDX license identifier                            # files
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
         and that resulted in the third patch in this series.
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
  12. 19 Oct, 2017 2 commits
  13. 12 Oct, 2017 1 commit
  14. 03 Aug, 2017 1 commit
    • Lorenzo Pieralisi's avatar
      unicore32/PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping hooks · 0d368cb0
      Lorenzo Pieralisi authored
      The pci_fixup_irqs() function allocates IRQs for all PCI devices present in
      a system; those PCI devices possibly belong to different PCI bus trees (and
      possibly rooted at different host bridges) and may well be enabled (ie
      probed and bound to a driver) by the time pci_fixup_irqs() is called when
      probing a given host bridge driver.
      Furthermore, current kernel code relying on pci_fixup_irqs() to assign
      legacy PCI IRQs to devices does not work at all for hotplugged devices in
      that the code carrying out the IRQ fixup is called at host bridge driver
      probe time, which just cannot take into account devices hotplugged after
      the system has booted.
      The introduction of map/swizzle function hooks in struct pci_host_bridge
      allows us to define per-bridge map/swizzle functions that can be used at
      device probe time in PCI core code to allocate IRQs for a given device
      (through pci_assign_irq()).
      Convert PCI host bridge initialization code to the
      pci_scan_root_bus_bridge() API (that allows to pass a struct
      pci_host_bridge with initialized map/swizzle pointers) and remove the
      pci_fixup_irqs() call from arch code.
      Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
      Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
      Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
  15. 11 Jul, 2017 1 commit
    • Masahiro Yamada's avatar
      unicore32: move generic-y of exported headers to uapi/asm/Kbuild · ee73056b
      Masahiro Yamada authored
      Since commit fcc8487d ("uapi: export all headers under uapi
      directories"), all (and only) headers under uapi directories are
      exported, but asm-generic wrappers are still exceptions.
      To complete de-coupling the uapi from kernel headers, move generic-y
      of exported headers to uapi/asm/Kbuild.
      With this change, "make headers_install" will just need to parse
      uapi/asm/Kbuild to build up exported headers.
      Also, move "generic-y += kprobes.h" up in order to keep the entries
      Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
  16. 04 Jun, 2017 1 commit
  17. 10 May, 2017 1 commit
    • Nicolas Dichtel's avatar
      uapi: export all headers under uapi directories · fcc8487d
      Nicolas Dichtel authored
      Regularly, when a new header is created in include/uapi/, the developer
      forgets to add it in the corresponding Kbuild file. This error is usually
      detected after the release is out.
      In fact, all headers under uapi directories should be exported, thus it's
      useless to have an exhaustive list.
      After this patch, the following files, which were not exported, are now
      exported (with make headers_install_all):
      Note that I have removed from this list the files which are generated in every
      exported directories (like .install or .install.cmd).
      Thanks to Julien Floret <julien.floret@6wind.com> for the tip to get all
      subdirs with a pure makefile command.
      For the record, note that exported files for asm directories are a mix of
      files listed by:
       - include/uapi/asm-generic/Kbuild.asm;
       - arch/<arch>/include/uapi/asm/Kbuild;
       - arch/<arch>/include/asm/Kbuild.
      Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
      Acked-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
      Acked-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      Acked-by: default avatarMark Salter <msalter@redhat.com>
      Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
      Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
  18. 26 Apr, 2017 1 commit
  19. 20 Apr, 2017 2 commits
  20. 18 Apr, 2017 1 commit
  21. 14 Apr, 2017 1 commit
    • Nicolai Stange's avatar
      unicore32/time: Set ->min_delta_ticks and ->max_delta_ticks · 16c125b6
      Nicolai Stange authored
      In preparation for making the clockevents core NTP correction aware,
      all clockevent device drivers must set ->min_delta_ticks and
      ->max_delta_ticks rather than ->min_delta_ns and ->max_delta_ns: a
      clockevent device's rate is going to change dynamically and thus, the
      ratio of ns to ticks ceases to stay invariant.
      Make the unicore32 arch's clockevent driver initialize these fields
      This patch alone doesn't introduce any change in functionality as the
      clockevents core still looks exclusively at the (untouched) ->min_delta_ns
      and ->max_delta_ns. As soon as this has changed, a followup patch will
      purge the initialization of ->min_delta_ns and ->max_delta_ns from this
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
      Cc: Richard Cochran <richardcochran@gmail.com>
      Cc: Prarit Bhargava <prarit@redhat.com>
      Cc: Stephen Boyd <sboyd@codeaurora.org>
      Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
      Signed-off-by: default avatarNicolai Stange <nicstange@gmail.com>
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
  22. 28 Mar, 2017 4 commits
  23. 20 Mar, 2017 1 commit
  24. 18 Mar, 2017 1 commit
  25. 09 Mar, 2017 1 commit
  26. 06 Mar, 2017 1 commit
  27. 02 Mar, 2017 4 commits
  28. 28 Feb, 2017 1 commit
    • Luis R. Rodriguez's avatar
      kprobes: move kprobe declarations to asm-generic/kprobes.h · 7d134b2c
      Luis R. Rodriguez authored
      Often all is needed is these small helpers, instead of compiler.h or a
      full kprobes.h.  This is important for asm helpers, in fact even some
      asm/kprobes.h make use of these helpers...  instead just keep a generic
      asm file with helpers useful for asm code with the least amount of
      clutter as possible.
      Likewise we need now to also address what to do about this file for both
      when architectures have CONFIG_HAVE_KPROBES, and when they do not.  Then
      for when architectures have CONFIG_HAVE_KPROBES but have disabled
      Right now most asm/kprobes.h do not have guards against CONFIG_KPROBES,
      this means most architecture code cannot include asm/kprobes.h safely.
      Correct this and add guards for architectures missing them.
      Additionally provide architectures that not have kprobes support with
      the default asm-generic solution.  This lets us force asm/kprobes.h on
      the header include/linux/kprobes.h always, but most importantly we can
      now safely include just asm/kprobes.h on architecture code without
      bringing the full kitchen sink of header files.
      Two architectures already provided a guard against CONFIG_KPROBES on its
      kprobes.h: sh, arch.  The rest of the architectures needed gaurds added.
      We avoid including any not-needed headers on asm/kprobes.h unless
      kprobes have been enabled.
      In a subsequent atomic change we can try now to remove compiler.h from
      During this sweep I've also identified a few architectures defining a
      common macro needed for both kprobes and ftrace, that of the definition
      of the breakput instruction up.  Some refer to this as
      BREAKPOINT_INSTRUCTION.  This must be kept outside of the #ifdef
      CONFIG_KPROBES guard.
      [mcgrof@kernel.org: fix arm64 build]
        Link: http://lkml.kernel.org/r/CAB=NE6X1WMByuARS4mZ1g9+W=LuVBnMDnh_5zyN0CLADaVh=Jw@mail.gmail.com
      [sfr@canb.auug.org.au: fixup for kprobes declarations moving]
        Link: http://lkml.kernel.org/r/20170214165933.13ebd4f4@canb.auug.org.au
      Link: http://lkml.kernel.org/r/20170203233139.32682-1-mcgrof@kernel.orgSigned-off-by: default avatarLuis R. Rodriguez <mcgrof@kernel.org>
      Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      Acked-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Masami Hiramatsu <mhiramat@kernel.org>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>