1. 10 May, 2007 1 commit
    • Andrew Morton's avatar
      add upper-32-bits macro · 218e180e
      Andrew Morton authored
      We keep on getting "right shift count >= width of type" warnings when doing
      things like
      	sector_t s;
      	x = s >> 56;
      because with CONFIG_LBD=n, s is only 32-bit.  Similar problems can occur with
      So add a simple wrapper function which code can use to avoid this warning.
      The above example would become
      	x = upper_32_bits(s) >> 24;
      The first user is in fact AFS.
      Cc: James Bottomley <James.Bottomley@SteelEye.com>
      Cc: "Cameron, Steve" <Steve.Cameron@hp.com>
      Cc: "Miller, Mike (OS Dev)" <Mike.Miller@hp.com>
      Cc: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
      Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
      Cc: David Howells <dhowells@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
  2. 07 May, 2007 1 commit
  3. 30 Apr, 2007 1 commit
  4. 12 Feb, 2007 2 commits
  5. 11 Feb, 2007 3 commits
  6. 10 Jan, 2007 1 commit
  7. 11 Dec, 2006 1 commit
    • Linus Torvalds's avatar
      Make SLES9 "get_kernel_version" work on the kernel binary again · 8993780a
      Linus Torvalds authored
      As reported by Andy Whitcroft, at least the SLES9 initrd build process
      depends on getting the kernel version from the kernel binary.  It does
      that by simply trawling the binary and looking for the signature of the
      "linux_banner" string (the string "Linux version " to be exact. Which
      is really broken in itself, but whatever..)
      That got broken when the string was changed to allow /proc/version to
      change the UTS release information dynamically, and "get_kernel_version"
      thus returned "%s" (see commit a2ee8649
      "[PATCH] Fix linux banner utsname information").
      This just restores "linux_banner" as a static string, which should fix
      the version finding.  And /proc/version simply uses a different string.
      To avoid wasting even that miniscule amount of memory, the early boot
      string should really be marked __initdata, but that just causes the same
      bug in SLES9 to re-appear, since it will then find other occurrences of
      "Linux version " first.
      Cc: Andy Whitcroft <apw@shadowen.org>
      Acked-by: default avatarHerbert Poetzl <herbert@13thfloor.at>
      Cc: Andi Kleen <ak@suse.de>
      Cc: Andrew Morton <akpm@osdl.org>
      Cc: Steve Fox <drfickle@us.ibm.com>
      Acked-by: default avatarOlaf Hering <olaf@aepfle.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  8. 08 Dec, 2006 2 commits
    • David Howells's avatar
      [PATCH] LOG2: Alter roundup_pow_of_two() so that it can use a ilog2() on a constant · 312a0c17
      David Howells authored
      Alter roundup_pow_of_two() so that it can make use of ilog2() on a constant to
      produce a constant value, retaining the ability for an arch to override it in
      the non-const case.
      This permits the function to be used to initialise variables.
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • 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
      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>
  9. 29 Nov, 2006 1 commit
  10. 26 Nov, 2006 1 commit
    • Linus Torvalds's avatar
      Fix 'ALIGN()' macro, take 2 · 2ea58144
      Linus Torvalds authored
      You wouldn't think that doing an ALIGN() macro that aligns something up
      to a power-of-two boundary would be likely to have bugs, would you?
      But hey, in the wonderful world of mixing integer types, you have to be
      careful.  This just makes sure that the alignment is interpreted in the
      same type as the thing to be aligned.
      Thanks to Roland Dreier, who noticed that the amso1100 driver got broken
      by the previous fix (that just extended the mask to "unsigned long", but
      was still broken in "unsigned long long" - it just happened to be the
      same on 64-bit architectures).
      See commit 4c8bd7ee
       for the history of
      bugs here...
      Acked-by: default avatarRoland Dreier <rdreier@cisco.com>
      Cc: Andrew Morton <akpm@osdl.org>
      Cc: David Miller <davem@davemloft.net>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  11. 03 Nov, 2006 1 commit
    • Andrew Morton's avatar
      [PATCH] Add printk_timed_ratelimit() · f46c4833
      Andrew Morton authored
      printk_ratelimit() has global state which makes it not useful for callers
      which wish to perform ratelimiting at a particular frequency.
      Add a printk_timed_ratelimit() which utilises caller-provided state storage to
      permit more flexibility.
      This function can in fact be used for things other than printk ratelimiting
      and is perhaps poorly named.
      Cc: Ulrich Drepper <drepper@redhat.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  12. 03 Oct, 2006 1 commit
    • Zach Brown's avatar
      [PATCH] pr_debug: check pr_debug() arguments · 8b2a1fd1
      Zach Brown authored
      check pr_debug() arguments
      When DEBUG isn't defined pr_debug() is defined away as an empty macro.  By
      throwing away the arguments we allow completely incorrect code to build.
      Instead let's make it an empty inline which checks arguments and mark it so gcc
      can check the format specification.
      This results in a seemingly insignificant code size increase.  A x86-64
         text    data     bss     dec     hex filename
      25354768        7191098 4854720 37400586        23ab00a vmlinux.before
      25354945        7191138 4854720 37400803        23ab0e3 vmlinux
      Signed-off-by: default avatarZach Brown <zach.brown@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  13. 27 Sep, 2006 1 commit
  14. 26 Sep, 2006 2 commits
    • Steven Whitehouse's avatar
      [PATCH] add DIV_ROUND_UP() · 930631ed
      Steven Whitehouse authored
      Add the DIV_ROUND_UP() helper macro: divide `n' by `d', rounding up.
      Stolen from the gfs2 tree(!) because the swsusp patches need it.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • Don Zickus's avatar
      [PATCH] x86: Allow users to force a panic on NMI · 8da5adda
      Don Zickus authored
      To quote Alan Cox:
      The default Linux behaviour on an NMI of either memory or unknown is to
      continue operation. For many environments such as scientific computing
      it is preferable that the box is taken out and the error dealt with than
      an uncorrected parity/ECC error get propogated.
      A small number of systems do generate NMI's for bizarre random reasons
      such as power management so the default is unchanged. In other respects
      the new proc/sys entry works like the existing panic controls already in
      that directory.
      This is separate to the edac support - EDAC allows supported chipsets to
      handle ECC errors well, this change allows unsupported cases to at least
      panic rather than cause problems further down the line.
      Signed-off-by: default avatarDon Zickus <dzickus@redhat.com>
      Signed-off-by: default avatarAndi Kleen <ak@suse.de>
  15. 23 Sep, 2006 1 commit
  16. 11 Aug, 2006 1 commit
  17. 10 Jul, 2006 1 commit
  18. 26 Jun, 2006 1 commit
  19. 25 Jun, 2006 1 commit
  20. 23 Jun, 2006 2 commits
    • Hua Zhong's avatar
      [PATCH] remove unlikely() in might_sleep_if() · 368a5fa1
      Hua Zhong authored
      The likely() profiling tools show that __alloc_page() causes a lot of misses:
      !       132    119193 __alloc_pages():mm/page_alloc.c@937
      Because most __alloc_page() calls are not atomic.
      Signed-off-by: default avatarHua Zhong <hzhong@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    • OGAWA Hirofumi's avatar
      [PATCH] writeback: fix range handling · 111ebb6e
      OGAWA Hirofumi authored
      When a writeback_control's `start' and `end' fields are used to
      indicate a one-byte-range starting at file offset zero, the required
      values of .start=0,.end=0 mean that the ->writepages() implementation
      has no way of telling that it is being asked to perform a range
      request.  Because we're currently overloading (start == 0 && end == 0)
      to mean "this is not a write-a-range request".
      To make all this sane, the patch changes range of writeback_control.
      So caller does: If it is calling ->writepages() to write pages, it
      sets range (range_start/end or range_cyclic) always.
      And if range_cyclic is true, ->writepages() thinks the range is
      cyclic, otherwise it just uses range_start and range_end.
      This patch does,
          - Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h
            -1 is usually ok for range_end (type is long long). But, if someone did,
      		range_end += val;		range_end is "val - 1"
      		u64val = range_end >> bits;	u64val is "~(0ULL)"
            or something, they are wrong. So, this adds LLONG_MAX to avoid nasty
            things, and uses LLONG_MAX for range_end.
          - All callers of ->writepages() sets range_start/end or range_cyclic.
          - Fix updates of ->writeback_index. It seems already bit strange.
            If it starts at 0 and ended by check of nr_to_write, this last
            index may reduce chance to scan end of file.  So, this updates
            ->writeback_index only if range_cyclic is true or whole-file is
      Signed-off-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
      Cc: Nathan Scott <nathans@sgi.com>
      Cc: Anton Altaparmakov <aia21@cantab.net>
      Cc: Steven French <sfrench@us.ibm.com>
      Cc: "Vladimir V. Saveliev" <vs@namesys.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  21. 15 May, 2006 1 commit
  22. 11 Apr, 2006 1 commit
  23. 27 Mar, 2006 1 commit
    • Alan Stern's avatar
      [PATCH] Notifier chain update: API changes · e041c683
      Alan Stern authored
      The kernel's implementation of notifier chains is unsafe.  There is no
      protection against entries being added to or removed from a chain while the
      chain is in use.  The issues were discussed in this thread:
      We noticed that notifier chains in the kernel fall into two basic usage
      	"Blocking" chains are always called from a process context
      	and the callout routines are allowed to sleep;
      	"Atomic" chains can be called from an atomic context and
      	the callout routines are not allowed to sleep.
      We decided to codify this distinction and make it part of the API.  Therefore
      this set of patches introduces three new, parallel APIs: one for blocking
      notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
      really just the old API under a new name).  New kinds of data structures are
      used for the heads of the chains, and new routines are defined for
      registration, unregistration, and calling a chain.  The three APIs are
      explained in include/linux/notifier.h and their implementation is in
      With atomic and blocking chains, the implementation guarantees that the chain
      links will not be corrupted and that chain callers will not get messed up by
      entries being added or removed.  For raw chains the implementation provides no
      guarantees at all; users of this API must provide their own protections.  (The
      idea was that situations may come up where the assumptions of the atomic and
      blocking APIs are not appropriate, so it should be possible for users to
      handle these things in their own way.)
      There are some limitations, which should not be too hard to live with.  For
      atomic/blocking chains, registration and unregistration must always be done in
      a process context since the chain is protected by a mutex/rwsem.  Also, a
      callout routine for a non-raw chain must not try to register or unregister
      entries on its own chain.  (This did happen in a couple of places and the code
      had to be changed to avoid it.)
      Since atomic chains may be called from within an NMI handler, they cannot use
      spinlocks for synchronization.  Instead we use RCU.  The overhead falls almost
      entirely in the unregister routine, which is okay since unregistration is much
      less frequent that calling a chain.
      Here is the list of chains that we adjusted and their classifications.  None
      of them use the raw API, so for the moment it is only a placeholder.
      arch/i386/kernel/traps.c:		i386die_chain
      arch/ia64/kernel/traps.c:		ia64die_chain
      arch/powerpc/kernel/traps.c:		powerpc_die_chain
      arch/sparc64/kernel/traps.c:		sparc64die_chain
      arch/x86_64/kernel/traps.c:		die_chain
      drivers/char/ipmi/ipmi_si_intf.c:	xaction_notifier_list
      kernel/panic.c:				panic_notifier_list
      kernel/profile.c:			task_free_notifier
      net/bluetooth/hci_core.c:		hci_notifier
      net/ipv4/netfilter/ip_conntrack_core.c:	ip_conntrack_chain
      net/ipv4/netfilter/ip_conntrack_core.c:	ip_conntrack_expect_chain
      net/ipv6/addrconf.c:			inet6addr_chain
      net/netfilter/nf_conntrack_core.c:	nf_conntrack_chain
      net/netfilter/nf_conntrack_core.c:	nf_conntrack_expect_chain
      net/netlink/af_netlink.c:		netlink_chain
      arch/powerpc/platforms/pseries/reconfig.c:	pSeries_reconfig_chain
      arch/s390/kernel/process.c:		idle_chain
      arch/x86_64/kernel/process.c		idle_notifier
      drivers/base/memory.c:			memory_chain
      drivers/cpufreq/cpufreq.c		cpufreq_policy_notifier_list
      drivers/cpufreq/cpufreq.c		cpufreq_transition_notifier_list
      drivers/macintosh/adb.c:		adb_client_list
      drivers/macintosh/via-pmu.c		sleep_notifier_list
      drivers/macintosh/via-pmu68k.c		sleep_notifier_list
      drivers/macintosh/windfarm_core.c	wf_client_list
      drivers/usb/core/notify.c		usb_notifier_list
      drivers/video/fbmem.c			fb_notifier_list
      kernel/cpu.c				cpu_chain
      kernel/module.c				module_notify_list
      kernel/profile.c			munmap_notifier
      kernel/profile.c			task_exit_notifier
      kernel/sys.c				reboot_notifier_list
      net/core/dev.c				netdev_chain
      net/decnet/dn_dev.c:			dnaddr_chain
      net/ipv4/devinet.c:			inetaddr_chain
      It's possible that some of these classifications are wrong.  If they are,
      please let us know or submit a patch to fix them.  Note that any chain that
      gets called very frequently should be atomic, because the rwsem read-locking
      used for blocking chains is very likely to incur cache misses on SMP systems.
      (However, if the chain's callout routines may sleep then the chain cannot be
      The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
      material written by Keith Owens and suggestions from Paul McKenney and Andrew
      [jes@sgi.com: restructure the notifier chain initialization macros]
      Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
      Signed-off-by: default avatarChandra Seetharaman <sekharan@us.ibm.com>
      Signed-off-by: default avatarJes Sorensen <jes@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  24. 25 Mar, 2006 1 commit
    • Andrew Morton's avatar
      [PATCH] roundup_pow_of_two() 64-bit fix · 962749af
      Andrew Morton authored
      fls() takes an integer, so roundup_pow_of_two() is busted for ulongs larger
      than 2^32-1.
      Fix this by implementing and using fls_long().
      (Why does roundup_pow_of_two() return a long?)
      (Why is roundup_pow_of_two() __attribute_const__ whereas long_log2() is
      (Why does long_log2() suck so much?  Because we were missing fls_long()?)
      Cc: Roland Dreier <rdreier@cisco.com>
      Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
      Cc: John Hawkes <hawkes@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  25. 23 Mar, 2006 1 commit
    • Andrew Morton's avatar
      [PATCH] pause_on_oops command line option · dd287796
      Andrew Morton authored
      Attempt to fix the problem wherein people's oops reports scroll off the screen
      due to repeated oopsing or to oopses on other CPUs.
      If this happens the user can reboot with the `pause_on_oops=<seconds>' option.
      It will allow the first oopsing CPU to print an oops record just a single
      time.  Second oopsing attempts, or oopses on other CPUs will cause those CPUs
      to enter a tight loop until the specified number of seconds have elapsed.
      The patch implements the infrastructure generically in the expectation that
      architectures other than x86 will find it useful.
      Cc: Dave Jones <davej@codemonkey.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
  26. 27 Feb, 2006 1 commit
    • Steven Whitehouse's avatar
      [GFS2] Macros removal in gfs2.h · 5c676f6d
      Steven Whitehouse authored
      As suggested by Pekka Enberg <penberg@cs.helsinki.fi>.
      The DIV_RU macro is renamed DIV_ROUND_UP and and moved to kernel.h
      The other macros are gone from gfs2.h as (although not requested
      by Pekka Enberg) are a number of included header file which are now
      included individually. The inode number comparison function is
      now an inline function.
      The DT2IF and IF2DT may be addressed in a future patch.
      Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
  27. 17 Feb, 2006 1 commit
  28. 17 Jan, 2006 1 commit
  29. 13 Jan, 2006 1 commit
    • Joe Perches's avatar
      [NET]: Use NIP6_FMT in kernel.h · 46b86a2d
      Joe Perches authored
      There are errors and inconsistency in the display of NIP6 strings.
      	ie: net/ipv6/ip6_flowlabel.c
      There are errors and inconsistency in the display of NIPQUAD strings too.
      	ie: net/netfilter/nf_conntrack_ftp.c
      This patch:
      	adds NIP6_FMT to kernel.h
      	changes all code to use NIP6_FMT
      	fixes net/ipv6/ip6_flowlabel.c
      	adds NIPQUAD_FMT to kernel.h
      	fixes net/netfilter/nf_conntrack_ftp.c
      	changes a few uses of "%u.%u.%u.%u" to NIPQUAD_FMT for symmetry to NIP6_FMT
      Signed-off-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
  30. 10 Jan, 2006 1 commit
  31. 09 Jan, 2006 1 commit
  32. 08 Jan, 2006 1 commit
  33. 15 Dec, 2005 1 commit
  34. 07 Nov, 2005 1 commit