1. 02 Nov, 2017 1 commit
    • 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
         lines).
      
      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>
      b2441318
  2. 05 Jun, 2017 1 commit
    • Andy Lutomirski's avatar
      x86/mm: Pass flush_tlb_info to flush_tlb_others() etc · a2055abe
      Andy Lutomirski authored
      Rather than passing all the contents of flush_tlb_info to
      flush_tlb_others(), pass a pointer to the structure directly. For
      consistency, this also removes the unnecessary cpu parameter from
      uv_flush_tlb_others() to make its signature match the other
      *flush_tlb_others() functions.
      
      This serves two purposes:
      
       - It will dramatically simplify future patches that change struct
         flush_tlb_info, which I'm planning to do.
      
       - struct flush_tlb_info is an adequate description of what to do
         for a local flush, too, so by reusing it we can remove duplicated
         code between local and remove flushes in a future patch.
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Acked-by: default avatarRik van Riel <riel@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Borislav Petkov <bpetkov@suse.de>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Nadav Amit <nadav.amit@gmail.com>
      Cc: Nadav Amit <namit@vmware.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: linux-mm@kvack.org
      [ Fix build warning. ]
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      a2055abe
  3. 22 Mar, 2017 1 commit
  4. 13 Mar, 2017 5 commits
  5. 01 Feb, 2017 2 commits
  6. 22 Sep, 2016 4 commits
  7. 10 Aug, 2016 1 commit
  8. 04 May, 2016 15 commits
  9. 01 Apr, 2016 1 commit
    • Alex Thorlton's avatar
      x86/platform/uv: Disable UV BAU by default · 1c532e00
      Alex Thorlton authored
      For several years, the common practice has been to boot UVs with the
      "nobau" parameter on the command line, to disable the BAU.  We've
      decided that it makes more sense to just disable the BAU by default in
      the kernel, and provide the option to turn it on, if desired.
      
      For now, having the on/off switch doesn't buy us any more than just
      reversing the logic would, but we're working towards having the BAU
      enabled by default on UV4.  When those changes are in place, having the
      on/off switch will make more sense than an enable flag, since the
      default behavior will be different depending on the system version.
      
      I've also added a bit of documentation for the new parameter to
      Documentation/kernel-parameters.txt.
      Signed-off-by: default avatarAlex Thorlton <athorlton@sgi.com>
      Reviewed-by: default avatarHedi Berriche <hedi@sgi.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1459451909-121845-1-git-send-email-athorlton@sgi.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      1c532e00
  10. 13 Sep, 2015 1 commit
    • George Beshers's avatar
      x86/platform/uv: Insert per_cpu accessor function on uv_hub_nmi · 7c52198b
      George Beshers authored
      UV: NMI: insert this_cpu_read accessor function on uv_hub_nmi.
      
      On SGI UV systems a 'power nmi' command from the CMC causes
      all processors to drop into uv_handle_nmi().  With the 4.0
      kernel this results in
      
          BUG: unable to handle kernel paging request
      
      The bug is caused by the current code trying to use the PER_CPU
      variable uv_cpu_nmi.hub without an appropriate accessor
      function. That oversight occurred in
      
          commit e1632170 ("uv: Replace __get_cpu_var")
          Author: Christoph Lameter <cl@linux.com>
          Date:   Sun Aug 17 12:30:41 2014 -0500
      
      This patch inserts this_cpu_read() in the uv_hub_nmi macro
      restoring the intended functionality.
      Signed-off-by: default avatarGeorge Beshers <gbeshers@sgi.com>
      Acked-by: default avatarMike Travis <travis@sgi.com>
      Cc: Alex Thorlton <athorlton@sgi.com>
      Cc: Dimitri Sivanich <sivanich@sgi.com>
      Cc: Hedi Berriche <hedi@sgi.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Russ Anderson <rja@sgi.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: linux-kernel@vger.kernel.org
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      7c52198b
  11. 03 Nov, 2014 1 commit
  12. 26 Aug, 2014 2 commits
    • Christoph Lameter's avatar
      uv: Replace __get_cpu_var · e1632170
      Christoph Lameter authored
      Use __this_cpu_read instead.
      
      Cc: Hedi Berriche <hedi@sgi.com>
      Cc: Mike Travis <travis@sgi.com>
      Cc: Dimitri Sivanich <sivanich@sgi.com>
      Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      e1632170
    • Christoph Lameter's avatar
      x86: Replace __get_cpu_var uses · 89cbc767
      Christoph Lameter authored
      __get_cpu_var() is used for multiple purposes in the kernel source. One of
      them is address calculation via the form &__get_cpu_var(x).  This calculates
      the address for the instance of the percpu variable of the current processor
      based on an offset.
      
      Other use cases are for storing and retrieving data from the current
      processors percpu area.  __get_cpu_var() can be used as an lvalue when
      writing data or on the right side of an assignment.
      
      __get_cpu_var() is defined as :
      
      #define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
      
      __get_cpu_var() always only does an address determination. However, store
      and retrieve operations could use a segment prefix (or global register on
      other platforms) to avoid the address calculation.
      
      this_cpu_write() and this_cpu_read() can directly take an offset into a
      percpu area and use optimized assembly code to read and write per cpu
      variables.
      
      This patch converts __get_cpu_var into either an explicit address
      calculation using this_cpu_ptr() or into a use of this_cpu operations that
      use the offset.  Thereby address calculations are avoided and less registers
      are used when code is generated.
      
      Transformations done to __get_cpu_var()
      
      1. Determine the address of the percpu instance of the current processor.
      
      	DEFINE_PER_CPU(int, y);
      	int *x = &__get_cpu_var(y);
      
          Converts to
      
      	int *x = this_cpu_ptr(&y);
      
      2. Same as #1 but this time an array structure is involved.
      
      	DEFINE_PER_CPU(int, y[20]);
      	int *x = __get_cpu_var(y);
      
          Converts to
      
      	int *x = this_cpu_ptr(y);
      
      3. Retrieve the content of the current processors instance of a per cpu
      variable.
      
      	DEFINE_PER_CPU(int, y);
      	int x = __get_cpu_var(y)
      
         Converts to
      
      	int x = __this_cpu_read(y);
      
      4. Retrieve the content of a percpu struct
      
      	DEFINE_PER_CPU(struct mystruct, y);
      	struct mystruct x = __get_cpu_var(y);
      
         Converts to
      
      	memcpy(&x, this_cpu_ptr(&y), sizeof(x));
      
      5. Assignment to a per cpu variable
      
      	DEFINE_PER_CPU(int, y)
      	__get_cpu_var(y) = x;
      
         Converts to
      
      	__this_cpu_write(y, x);
      
      6. Increment/Decrement etc of a per cpu variable
      
      	DEFINE_PER_CPU(int, y);
      	__get_cpu_var(y)++
      
         Converts to
      
      	__this_cpu_inc(y)
      
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: x86@kernel.org
      Acked-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      89cbc767
  13. 05 Jun, 2014 1 commit
    • Cliff Wickman's avatar
      x86/uv: Update the UV3 TLB shootdown logic · a26fd719
      Cliff Wickman authored
      Update of TLB shootdown code for UV3.
      
      Kernel function native_flush_tlb_others() calls
      uv_flush_tlb_others() on UV to invalidate tlb page definitions
      on remote cpus. The UV systems have a hardware 'broadcast assist
      unit' which can be used to broadcast shootdown messages to all
      cpu's of selected nodes.
      
      The behavior of the BAU has changed only slightly with UV3:
      
        - UV3 is recognized with is_uv3_hub().
        - UV2 functions and structures (uv2_xxx) are in most cases
          simply renamed to uv2_3_xxx.
        - Some UV2 error workarounds are not needed for UV3.
          (see uv_bau_message_interrupt and enable_timeouts)
      Signed-off-by: default avatarCliff Wickman <cpw@sgi.com>
      Link: http://lkml.kernel.org/r/E1WkgWh-0001yJ-3K@eag09.americas.sgi.com
      [ Removed a few linebreak uglies. ]
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      a26fd719
  14. 01 Apr, 2014 1 commit
  15. 25 Jan, 2014 1 commit
  16. 11 Nov, 2013 1 commit
    • Ingo Molnar's avatar
      Revert "x86/UV: Add uvtrace support" · b5dfcb09
      Ingo Molnar authored
      This reverts commit 8eba1842.
      
      uv_trace() is not used by anything, nor is uv_trace_nmi_func, nor
      uv_trace_func.
      
      That's not how we do instrumentation code in the kernel: we add
      tracepoints, printk()s, etc. so that everyone not just those with
      magic kernel modules can debug a system.
      
      So remove this unused (and misguied) piece of code.
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      Cc: Mike Travis <travis@sgi.com>
      Cc: Dimitri Sivanich <sivanich@sgi.com>
      Cc: Hedi Berriche <hedi@sgi.com>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
      Cc: Jason Wessel <jason.wessel@windriver.com>
      Link: http://lkml.kernel.org/n/tip-tumfBffmr4jmnt8Gyxanoblg@git.kernel.org
      b5dfcb09
  17. 24 Sep, 2013 1 commit