1. 26 7月, 2011 1 次提交
  2. 25 5月, 2011 4 次提交
  3. 18 5月, 2011 1 次提交
  4. 27 10月, 2010 1 次提交
  5. 10 8月, 2010 1 次提交
  6. 30 6月, 2010 1 次提交
  7. 19 4月, 2010 1 次提交
  8. 30 3月, 2010 1 次提交
    • T
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking... · 5a0e3ad6
      Tejun Heo 提交于
      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: NTejun Heo <tj@kernel.org>
      Guess-its-ok-by: NChristoph Lameter <cl@linux-foundation.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
      5a0e3ad6
  9. 20 9月, 2009 1 次提交
  10. 01 4月, 2009 1 次提交
  11. 13 3月, 2009 1 次提交
  12. 05 12月, 2008 1 次提交
  13. 23 10月, 2008 2 次提交
  14. 17 10月, 2008 1 次提交
  15. 25 7月, 2008 1 次提交
  16. 13 6月, 2008 2 次提交
  17. 07 6月, 2008 4 次提交
  18. 22 5月, 2008 1 次提交
  19. 13 5月, 2008 6 次提交
  20. 28 4月, 2008 2 次提交
  21. 27 4月, 2008 1 次提交
  22. 24 2月, 2008 1 次提交
    • J
      uml: fix FP register corruption · 2f56debd
      Jeff Dike 提交于
      Commit ee3d9bd4 ("uml: simplify SIGSEGV
      handling"), while greatly simplifying the kernel SIGSEGV handler that
      runs in the process address space, introduced a bug which corrupts FP
      state in the process.
      
      Previously, the SIGSEGV handler called the sigreturn system call by hand - it
      couldn't return through the restorer provided to it because that could try to
      call the libc restorer which likely wouldn't exist in the process address
      space.  So, it blocked off some signals, including SIGUSR1, on entry to the
      SIGSEGV handler, queued a SIGUSR1 to itself, and invoked sigreturn.  The
      SIGUSR1 was delivered, and was visible to the UML kernel after sigreturn
      finished.
      
      The commit eliminated the signal masking and the call to sigreturn.  The
      handler simply hits itself with a SIGTRAP to let the UML kernel know that it
      is finished.  UML then restores the process registers, which effectively
      longjmps the process out of the signal handler, skipping sigreturn's restoring
      of register state and the signal mask.
      
      The bug is that the host apparently sets used_fp to 0 when it saves the
      process FP state in the sigcontext on the process signal stack.  Thus, when
      the process is longjmped out of the handler, its FP state is corrupt because
      it wasn't saved on the context switch to the UML kernel.
      
      This manifested itself as sleep hanging.  For some reason, sleep uses floating
      point in order to calculate the sleep interval.  When a page fault corrupts
      its FP state, it is faked into essentially sleeping forever.
      
      This patch saves the FP state before entering the SIGSEGV handler and restores
      it afterwards.
      Signed-off-by: NJeff Dike <jdike@linux.intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      2f56debd
  23. 09 2月, 2008 3 次提交
    • J
      uml: improved error handling while locating temp dir · 11a7ac23
      Jim Meyering 提交于
      * arch/um/os-Linux/mem.c (make_tempfile): Don't deref NULL upon failed malloc.
      
      * arch/um/os-Linux/mem.c (make_tempfile): Handle NULL tempdir.
      Don't let a long tempdir (e.g., via TMPDIR) provoke heap corruption.
      
      [ jdike - formatting cleanups, deleted obsolete comment ]
      Signed-off-by: NJim Meyering <meyering@redhat.com>
      Signed-off-by: NJeff Dike <jdike@linux.intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      11a7ac23
    • J
      uml: style fixes in arch/um/os-Linux · 5134d8fe
      Jeff Dike 提交于
      Style changes under arch/um/os-Linux:
      	include trimming
      	CodingStyle fixes
      	some printks needed severity indicators
      
      make_tempfile turns out not to be used outside of mem.c, so it is now static.
      Its declaration in tempfile.h is no longer needed, and tempfile.h itself is no
      longer needed.
      
      create_tmp_file was also made static.
      
      checkpatch moans about an EXPORT_SYMBOL in user_syms.c which is part of a
      macro definition - this is copying a bit of kernel infrastructure into the
      libc side of UML because the kernel headers can't be included there.
      Signed-off-by: NJeff Dike <jdike@linux.intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      5134d8fe
    • J
      uml: runtime host VMSPLIT detection · 536788fe
      Jeff Dike 提交于
      Calculate TASK_SIZE at run-time by figuring out the host's VMSPLIT - this is
      needed on i386 if UML is to run on hosts with varying VMSPLITs without
      recompilation.
      
      TASK_SIZE is now defined in terms of a variable, task_size.  This gets rid of
      an include of pgtable.h from processor.h, which can cause include loops.
      
      On i386, task_size is calculated early in boot by probing the address space in
      a binary search to figure out where the boundary between usable and non-usable
      memory is.  This tries to make sure that a page that is considered to be in
      userspace is, or can be made, read-write.  I'm concerned about a system-global
      VDSO page in kernel memory being hit and considered to be a userspace page.
      
      On x86_64, task_size is just the old value of CONFIG_TOP_ADDR.
      
      A bunch of config variable are gone now.  CONFIG_TOP_ADDR is directly replaced
      by TASK_SIZE.  NEST_LEVEL is gone since the relocation of the stubs makes it
      irrelevant.  All the HOST_VMSPLIT stuff is gone.  All references to these in
      arch/um/Makefile are also gone.
      
      I noticed and fixed a missing extern in os.h when adding os_get_task_size.
      
      Note: This has been revised to fix the 32-bit UML on 64-bit host bug that
      Miklos ran into.
      Signed-off-by: NJeff Dike <jdike@linux.intel.com>
      Cc: Miklos Szeredi <miklos@szeredi.hu>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      536788fe
  24. 06 2月, 2008 1 次提交