1. 06 Sep, 2008 2 commits
  2. 20 Jul, 2008 2 commits
  3. 18 May, 2008 2 commits
  4. 09 Feb, 2008 1 commit
  5. 08 Feb, 2008 2 commits
    • H. Peter Anvin's avatar
      avoid overflows in kernel/time.c · bdc80787
      H. Peter Anvin authored
      
      
      When the conversion factor between jiffies and milli- or microseconds is
      not a single multiply or divide, as for the case of HZ == 300, we currently
      do a multiply followed by a divide.  The intervening result, however, is
      subject to overflows, especially since the fraction is not simplified (for
      HZ == 300, we multiply by 300 and divide by 1000).
      
      This is exposed to the user when passing a large timeout to poll(), for
      example.
      
      This patch replaces the multiply-divide with a reciprocal multiplication on
      32-bit platforms.  When the input is an unsigned long, there is no portable
      way to do this on 64-bit platforms there is no portable way to do this
      since it requires a 128-bit intermediate result (which gcc does support on
      64-bit platforms but may generate libgcc calls, e.g.  on 64-bit s390), but
      since the output is a 32-bit integer in the cases affected, just simplify
      the multiply-divide (*3/10 instead of *300/1000).
      
      The reciprocal multiply used can have off-by-one errors in the upper half
      of the valid output range.  This could be avoided at the expense of having
      to deal with a potential 65-bit intermediate result.  Since the intent is
      to avoid overflow problems and most of the other time conversions are only
      semiexact, the off-by-one errors were considered an acceptable tradeoff.
      
      At Ralf Baechle's suggestion, this version uses a Perl script to compute
      the necessary constants.  We already have dependencies on Perl for kernel
      compiles.  This does, however, require the Perl module Math::BigInt, which
      is included in the standard Perl distribution starting with version 5.8.0.
      In order to support older versions of Perl, include a table of canned
      constants in the script itself, and structure the script so that
      Math::BigInt isn't required if pulling values from said table.
      
      Running the script requires that the HZ value is available from the
      Makefile.  Thus, this patch also adds the Kconfig variable CONFIG_HZ to the
      architectures which didn't already have it (alpha, cris, frv, h8300, m32r,
      m68k, m68knommu, sparc, v850, and xtensa.) It does *not* touch the sh or
      sh64 architectures, since Paul Mundt has dealt with those separately in the
      sh tree.
      Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>,
      Cc: Sam Ravnborg <sam@ravnborg.org>,
      Cc: Paul Mundt <lethal@linux-sh.org>,
      Cc: Richard Henderson <rth@twiddle.net>,
      Cc: Michael Starvik <starvik@axis.com>,
      Cc: David Howells <dhowells@redhat.com>,
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>,
      Cc: Hirokazu Takata <takata@linux-m32r.org>,
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
      Cc: Roman Zippel <zippel@linux-m68k.org>,
      Cc: William L. Irwin <sparclinux@vger.kernel.org>,
      Cc: Chris Zankel <chris@zankel.net>,
      Cc: H. Peter Anvin <hpa@zytor.com>,
      Cc: Jan Engelhardt <jengelh@computergmbh.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bdc80787
    • David Howells's avatar
      aout: mark arches that support A.OUT format · b0b933c0
      David Howells authored
      
      
      Mark arches that support A.OUT format by including the following in their
      master Kconfig files:
      
      	config ARCH_SUPPORTS_AOUT
      		def_bool y
      
      This should also be set if the arch provides compatibility A.OUT support for
      an older arch, for instance x86_64 for i386 or sparc64 for sparc.
      
      I've guessed at which arches don't, based on comments in the code, however I'm
      sure that some of the ones I've marked as 'yes' actually should be 'no'.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Cc: <linux-arch@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b0b933c0
  6. 05 Feb, 2008 1 commit
  7. 03 Feb, 2008 1 commit
  8. 01 Feb, 2008 1 commit
  9. 19 Oct, 2007 1 commit
  10. 20 Jul, 2007 2 commits
  11. 20 Jun, 2007 1 commit
    • Andi Kleen's avatar
      x86_64: Quieten Atari keyboard warnings in Kconfig · 0e52d328
      Andi Kleen authored
      
      
      Not directly related to x86, but I got tired of seeing these warnings on every
      kconfig update when building on a non m68k box:
      
      drivers/input/keyboard/Kconfig:170:warning: 'select' used by config symbol 'KEYBOARD_ATARI' refers to undefined symbol 'ATARI_KBD_CORE'
      drivers/input/mouse/Kconfig:182:warning: 'select' used by config symbol 'MOUSE_ATARI' refers to undefined symbol 'ATARI_KBD_CORE'
      
      I moved the definition of ATARI_KBD_CORE into drivers/input/keyboard/Kconfig
      so it's always seen by Kconfig.
      
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Acked-by: default avatarRoman Zippel <zippel@linux-m68k.org>
      Signed-off-by: default avatarAndi Kleen <ak@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0e52d328
  12. 31 May, 2007 1 commit
  13. 04 May, 2007 1 commit
  14. 11 Feb, 2007 2 commits
    • Al Viro's avatar
      [PATCH] sort the devres mess out · 5ea81769
      Al Viro authored
      
      
      * Split the implementation-agnostic stuff in separate files.
      * Make sure that targets using non-default request_irq() pull
        kernel/irq/devres.o
      * Introduce new symbols (HAS_IOPORT and HAS_IOMEM) defaulting to positive;
        allow architectures to turn them off (we needed these symbols anyway for
        dependencies of quite a few drivers).
      * protect the ioport-related parts of lib/devres.o with CONFIG_HAS_IOPORT.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5ea81769
    • Christoph Lameter's avatar
      [PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMA · 5ac6da66
      Christoph Lameter authored
      
      
      As Andi pointed out: CONFIG_GENERIC_ISA_DMA only disables the ISA DMA
      channel management.  Other functionality may still expect GFP_DMA to
      provide memory below 16M.  So we need to make sure that CONFIG_ZONE_DMA is
      set independent of CONFIG_GENERIC_ISA_DMA.  Undo the modifications to
      mm/Kconfig where we made ZONE_DMA dependent on GENERIC_ISA_DMA and set
      theses explicitly in each arches Kconfig.
      
      Reviews must occur for each arch in order to determine if ZONE_DMA can be
      switched off.  It can only be switched off if we know that all devices
      supported by a platform are capable of performing DMA transfers to all of
      memory (Some arches already support this: uml, avr32, sh sh64, parisc and
      IA64/Altix).
      
      In order to switch ZONE_DMA off conditionally, one would have to establish
      a scheme by which one can assure that no drivers are enabled that are only
      capable of doing I/O to a part of memory, or one needs to provide an
      alternate means of performing an allocation from a specific range of memory
      (like provided by alloc_pages_range()) and insure that all drivers use that
      call.  In that case the arches alloc_dma_coherent() may need to be modified
      to call alloc_pages_range() instead of relying on GFP_DMA.
      Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5ac6da66
  15. 08 Dec, 2006 1 commit
    • David Howells's avatar
      [PATCH] LOG2: Implement a general integer log2 facility in the kernel · f0d1b0b3
      David Howells authored
      
      
      This facility provides three entry points:
      
      	ilog2()		Log base 2 of unsigned long
      	ilog2_u32()	Log base 2 of u32
      	ilog2_u64()	Log base 2 of u64
      
      These facilities can either be used inside functions on dynamic data:
      
      	int do_something(long q)
      	{
      		...;
      		y = ilog2(x)
      		...;
      	}
      
      Or can be used to statically initialise global variables with constant values:
      
      	unsigned n = ilog2(27);
      
      When performing static initialisation, the compiler will report "error:
      initializer element is not constant" if asked to take a log of zero or of
      something not reducible to a constant.  They treat negative numbers as
      unsigned.
      
      When not dealing with a constant, they fall back to using fls() which permits
      them to use arch-specific log calculation instructions - such as BSR on
      x86/x86_64 or SCAN on FRV - if available.
      
      [akpm@osdl.org: MMC fix]
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Herbert Xu <herbert@gondor.apana.org.au>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Wojtek Kaniewski <wojtekka@toxygen.net>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      f0d1b0b3
  16. 09 Oct, 2006 1 commit
  17. 26 Mar, 2006 1 commit
  18. 14 Feb, 2006 1 commit
  19. 08 Jan, 2006 1 commit
  20. 29 Oct, 2005 1 commit
    • Hugh Dickins's avatar
      [PATCH] mm: m68k kill stram swap · f9c98d02
      Hugh Dickins authored
      
      
      Please, please now delete the Atari CONFIG_STRAM_SWAP code.  It may be
      excellent and ingenious code, but its reference to swap_vfsmnt betrays that it
      hasn't been built since 2.5.1 (four years old come December), it's delving
      deep into matters which are the preserve of core mm code, its only purpose is
      to give the more conscientious mm guys an anxiety attack from time to time;
      yet we keep on breaking it more and more.
      
      If you want to use RAM for swap, then if the MTD driver does not already
      provide just what you need, I'm sure David could be persuaded to add the
      extra.  But you'd also like to be able to allocate extents of that swap for
      other use: we can give you a core interface for that if you need.  But unbuilt
      for four years suggests to me that there's no need at all.
      
      I cannot swear the patch below won't break your build, but believe so.
      Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      f9c98d02
  21. 07 Sep, 2005 1 commit
    • viro@ZenIV.linux.org.uk's avatar
      [PATCH] Kconfig fix (BLK_DEV_FD dependencies) · a08b6b79
      viro@ZenIV.linux.org.uk authored
      
      
      Sanitized and fixed floppy dependencies: split the messy dependencies for
      BLK_DEV_FD by introducing a new symbol (ARCH_MAY_HAVE_PC_FDC), making
      BLK_DEV_FD depend on that one and taking declarations of ARCH_MAY_HAVE_PC_FDC
      to arch/*/Kconfig.  While we are at it, fixed several obvious cases when
      BLK_DEV_FD should have been excluded (architectures lacking asm/floppy.h
      are *not* going to have floppy.c compile, let alone work).
      
      If you can come up with better name for that ("this architecture might
      have working PC-compatible floppy disk controller"), you are more than
      welcome - just s/ARCH_MAY_HAVE_PC_FDC/your_prefered_name/g in the patch
      below...
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      a08b6b79
  22. 11 Jul, 2005 1 commit
    • Sam Ravnborg's avatar
      [NET]: add a top-level Networking menu to *config · d5950b43
      Sam Ravnborg authored
      
      
      Create a new top-level menu named "Networking" thus moving
      net related options and protocol selection way from the drivers
      menu and up on the top-level where they belong.
      
      To implement this all architectures has to source "net/Kconfig" before
      drivers/*/Kconfig in their Kconfig file. This change has been
      implemented for all architectures.
      
      Device drivers for ordinary NIC's are still to be found
      in the Device Drivers section, but Bluetooth, IrDA and ax25
      are located with their corresponding menu entries under the new
      networking menu item.
      Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d5950b43
  23. 23 Jun, 2005 1 commit
  24. 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