1. 29 Aug, 2016 1 commit
    • Martin Schwidefsky's avatar
      s390/fpu: improve kernel_fpu_[begin|end] · 7f79695c
      Martin Schwidefsky authored
      In case of nested user of the FPU or vector registers in the kernel
      the current code uses the mask of the FPU/vector registers of the
      previous contexts to decide which registers to save and restore.
      E.g. if the previous context used KERNEL_VXR_V0V7 and the next
      context wants to use KERNEL_VXR_V24V31 the first 8 vector registers
      are stored to the FPU state structure. But this is not necessary
      as the next context does not use these registers.
      
      Rework the FPU/vector register save and restore code. The new code
      does a few things differently:
      1) A lowcore field is used instead of a per-cpu variable.
      2) The kernel_fpu_end function now has two parameters just like
         kernel_fpu_begin. The register flags are required by both
         functions to save / restore the minimal register set.
      3) The inline functions kernel_fpu_begin/kernel_fpu_end now do the
         update of the register masks. If the user space FPU registers
         have already been stored neither save_fpu_regs nor the
         __kernel_fpu_begin/__kernel_fpu_end functions have to be called
         for the first context. In this case kernel_fpu_begin adds 7
         instructions and kernel_fpu_end adds 4 instructions.
      3) The inline assemblies in __kernel_fpu_begin / __kernel_fpu_end
         to save / restore the vector registers are simplified a bit.
      Signed-off-by: 's avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      7f79695c
  2. 28 Jun, 2016 1 commit
  3. 15 Jun, 2016 1 commit
  4. 11 Jan, 2016 1 commit
  5. 30 Dec, 2015 1 commit
  6. 18 Dec, 2015 1 commit
  7. 09 Feb, 2015 1 commit
  8. 22 Jan, 2015 1 commit
    • Martin Schwidefsky's avatar
      s390: add SMT support · 10ad34bc
      Martin Schwidefsky authored
      The multi-threading facility is introduced with the z13 processor family.
      This patch adds code to detect the multi-threading facility. With the
      facility enabled each core will surface multiple hardware threads to the
      system. Each hardware threads looks like a normal CPU to the operating
      system with all its registers and properties.
      
      The SCLP interface reports the SMT topology indirectly via the maximum
      thread id. Each reported CPU in the result of a read-scp-information
      is a core representing a number of hardware threads.
      
      To reflect the reduced CPU capacity if two hardware threads run on a
      single core the MT utilization counter set is used to normalize the
      raw cputime obtained by the CPU timer deltas. This scaled cputime is
      reported via the taskstats interface. The normal /proc/stat numbers
      are based on the raw cputime and are not affected by the normalization.
      Signed-off-by: 's avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      10ad34bc
  9. 14 Jul, 2013 1 commit
    • Paul Gortmaker's avatar
      s390: delete __cpuinit usage from all s390 files · e2741f17
      Paul Gortmaker authored
      The __cpuinit type of throwaway sections might have made sense
      some time ago when RAM was more constrained, but now the savings
      do not offset the cost and complications.  For example, the fix in
      commit 5e427ec2 ("x86: Fix bit corruption at CPU resume time")
      is a good example of the nasty type of bugs that can be created
      with improper use of the various __init prefixes.
      
      After a discussion on LKML[1] it was decided that cpuinit should go
      the way of devinit and be phased out.  Once all the users are gone,
      we can then finally remove the macros themselves from linux/init.h.
      
      Note that some harmless section mismatch warnings may result, since
      notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
      are flagged as __cpuinit  -- so if we remove the __cpuinit from
      arch specific callers, we will also get section mismatch warnings.
      As an intermediate step, we intend to turn the linux/init.h cpuinit
      content into no-ops as early as possible, since that will get rid
      of these warnings.  In any case, they are temporary and harmless.
      
      This removes all the arch/s390 uses of the __cpuinit macros from
      all C files.  Currently s390 does not have any __CPUINIT used in
      assembly files.
      
      [1] https://lkml.org/lkml/2013/5/20/589
      
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: linux390@de.ibm.com
      Cc: linux-s390@vger.kernel.org
      Signed-off-by: 's avatarPaul Gortmaker <paul.gortmaker@windriver.com>
      e2741f17
  10. 26 Sep, 2012 4 commits
  11. 30 May, 2012 1 commit
    • Heiko Carstens's avatar
      s390/cpu: remove cpu "capabilities" sysfs attribute · b9e3f776
      Heiko Carstens authored
      It has been a big mistage to add the capabilities attribute to the
      cpus in sysfs:
      First the attribute only contains the cpu capability of primary cpus,
      which however is not necessarily (or better: unlikely) the type of
      cpu the kernel runs on, which is typically an IFL.
      In addition all information that is necessary is available in
      /proc/sysinfo already. So this attribute partially duplicated
      informations.
      So programs should look into the sysinfo file to retrieve all
      informations they are interested in.
      
      Since with this kernel release also the powersavings cpu attributes
      are removed this seems to be a good opportunity to remove another
      broken interface.
      Signed-off-by: 's avatarHeiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: 's avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      b9e3f776
  12. 30 Oct, 2011 1 commit
  13. 29 Oct, 2010 1 commit
  14. 25 Oct, 2010 2 commits
  15. 30 Mar, 2010 1 commit
    • Tejun Heo's avatar
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking... · 5a0e3ad6
      Tejun Heo authored
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
      
      percpu.h is included by sched.h and module.h and thus ends up being
      included when building most .c files.  percpu.h includes slab.h which
      in turn includes gfp.h making everything defined by the two files
      universally available and complicating inclusion dependencies.
      
      percpu.h -> slab.h dependency is about to be removed.  Prepare for
      this change by updating users of gfp and slab facilities include those
      headers directly instead of assuming availability.  As this conversion
      needs to touch large number of source files, the following script is
      used as the basis of conversion.
      
        http://userweb.kernel.org/~tj/misc/slabh-sweep.py
      
      The script does the followings.
      
      * Scan files for gfp and slab usages and update includes such that
        only the necessary includes are there.  ie. if only gfp is used,
        gfp.h, if slab is used, slab.h.
      
      * When the script inserts a new include, it looks at the include
        blocks and try to put the new include such that its order conforms
        to its surrounding.  It's put in the include block which contains
        core kernel includes, in the same order that the rest are ordered -
        alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
        doesn't seem to be any matching order.
      
      * If the script can't find a place to put a new include (mostly
        because the file doesn't have fitting include block), it prints out
        an error message indicating which .h file needs to be added to the
        file.
      
      The conversion was done in the following steps.
      
      1. The initial automatic conversion of all .c files updated slightly
         over 4000 files, deleting around 700 includes and adding ~480 gfp.h
         and ~3000 slab.h inclusions.  The script emitted errors for ~400
         files.
      
      2. Each error was manually checked.  Some didn't need the inclusion,
         some needed manual addition while adding it to implementation .h or
         embedding .c file was more appropriate for others.  This step added
         inclusions to around 150 files.
      
      3. The script was run again and the output was compared to the edits
         from #2 to make sure no file was left behind.
      
      4. Several build tests were done and a couple of problems were fixed.
         e.g. lib/decompress_*.c used malloc/free() wrappers around slab
         APIs requiring slab.h to be added manually.
      
      5. The script was run on all .h files but without automatically
         editing them as sprinkling gfp.h and slab.h inclusions around .h
         files could easily lead to inclusion dependency hell.  Most gfp.h
         inclusion directives were ignored as stuff from gfp.h was usually
         wildly available and often used in preprocessor macros.  Each
         slab.h inclusion directive was examined and added manually as
         necessary.
      
      6. percpu.h was updated not to include slab.h.
      
      7. Build test were done on the following configurations and failures
         were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
         distributed build env didn't work with gcov compiles) and a few
         more options had to be turned off depending on archs to make things
         build (like ipr on powerpc/64 which failed due to missing writeq).
      
         * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
         * powerpc and powerpc64 SMP allmodconfig
         * sparc and sparc64 SMP allmodconfig
         * ia64 SMP allmodconfig
         * s390 SMP allmodconfig
         * alpha SMP allmodconfig
         * um on x86_64 SMP allmodconfig
      
      8. percpu.h modifications were reverted so that it could be applied as
         a separate patch and serve as bisection point.
      
      Given the fact that I had only a couple of failures from tests on step
      6, I'm fairly confident about the coverage of this conversion patch.
      If there is a breakage, it's likely to be something in one of the arch
      headers which should be easily discoverable easily on most builds of
      the specific arch.
      Signed-off-by: 's avatarTejun Heo <tj@kernel.org>
      Guess-its-ok-by: 's avatarChristoph Lameter <cl@linux-foundation.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
      5a0e3ad6
  16. 26 Mar, 2009 1 commit
  17. 25 Dec, 2008 1 commit
  18. 17 Apr, 2008 2 commits
  19. 06 Feb, 2008 1 commit
    • Adrian Bunk's avatar
      calibrate_delay() must be __cpuinit · 6c81c32f
      Adrian Bunk authored
      calibrate_delay() must be __cpuinit, not __{dev,}init.
      
      I've verified that this is correct for all users.
      
      While doing the latter, I also did the following cleanups:
      - remove pointless additional prototypes in C files
      - ensure all users #include <linux/delay.h>
      
      This fixes the following section mismatches with CONFIG_HOTPLUG=n,
      CONFIG_HOTPLUG_CPU=y:
      
      WARNING: vmlinux.o(.text+0x1128d): Section mismatch: reference to .init.text.1:calibrate_delay (between 'check_cx686_slop' and 'set_cx86_reorder')
      WARNING: vmlinux.o(.text+0x25102): Section mismatch: reference to .init.text.1:calibrate_delay (between 'smp_callin' and 'cpu_coregroup_map')
      Signed-off-by: 's avatarAdrian Bunk <bunk@kernel.org>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Christian Zankel <chris@zankel.net>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      6c81c32f
  20. 27 Apr, 2007 1 commit
  21. 05 Feb, 2007 1 commit
  22. 20 Sep, 2006 1 commit
  23. 30 Jun, 2006 1 commit
  24. 06 Jan, 2006 1 commit
  25. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4