1. 28 Apr, 2016 1 commit
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    • 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
  8. 02 Oct, 2009 1 commit
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    • Randy Dunlap's avatar
      docsrc: build Documentation/ sources · 3794f3e8
      Randy Dunlap authored
      Currently source files in the Documentation/ sub-dir can easily bit-rot
      since they are not generally buildable, either because they are hidden in
      text files or because there are no Makefile rules for them.  This needs to
      be fixed so that the source files remain usable and good examples of code
      instead of bad examples.
      
      Add the ability to build source files that are in the Documentation/ dir.
      Add to Kconfig as "BUILD_DOCSRC" config symbol.
      
      Use "CONFIG_BUILD_DOCSRC=1 make ..." to build objects from the
      Documentation/ sources.  Or enable BUILD_DOCSRC in the *config system.
      However, this symbol depends on HEADERS_CHECK since the header files need
      to be installed (for userspace builds).
      
      Built (using cross-tools) for x86-64, i386, alpha, ia64, sparc32,
      sparc64, powerpc, sh, m68k, & mips.
      Signed-off-by: 's avatarRandy Dunlap <randy.dunlap@oracle.com>
      Reviewed-by: 's avatarSam Ravnborg <sam@ravnborg.org>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      3794f3e8
  15. 19 Jul, 2007 1 commit
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  20. 12 Sep, 2005 1 commit
    • Evgeniy Polyakov's avatar
      [NET]: Add netlink connector. · 7672d0b5
      Evgeniy Polyakov authored
      Kernel connector - new userspace <-> kernel space easy to use
      communication module which implements easy to use bidirectional
      message bus using netlink as it's backend.  Connector was created to
      eliminate complex skb handling both in send and receive message bus
      direction.
      
      Connector driver adds possibility to connect various agents using as
      one of it's backends netlink based network.  One must register
      callback and identifier. When driver receives special netlink message
      with appropriate identifier, appropriate callback will be called.
      
      From the userspace point of view it's quite straightforward:
      
      	socket();
      	bind();
      	send();
      	recv();
      
      But if kernelspace want to use full power of such connections, driver
      writer must create special sockets, must know about struct sk_buff
      handling...  Connector allows any kernelspace agents to use netlink
      based networking for inter-process communication in a significantly
      easier way:
      
      int cn_add_callback(struct cb_id *id, char *name, void (*callback) (void *));
      void cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask);
      
      struct cb_id
      {
      	__u32			idx;
      	__u32			val;
      };
      
      idx and val are unique identifiers which must be registered in
      connector.h for in-kernel usage.  void (*callback) (void *) - is a
      callback function which will be called when message with above idx.val
      will be received by connector core.
      
      Using connector completely hides low-level transport layer from it's
      users.
      
      Connector uses new netlink ability to have many groups in one socket.
      
      [ Incorporating many cleanups and fixes by myself and
        Andrew Morton -DaveM ]
      Signed-off-by: 's avatarEvgeniy Polyakov <johnpol@2ka.mipt.ru>
      Signed-off-by: 's avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
      7672d0b5