1. 14 Feb, 2007 1 commit
    • Tim Schmielau's avatar
      [PATCH] remove many unneeded #includes of sched.h · cd354f1a
      Tim Schmielau authored
      
      After Al Viro (finally) succeeded in removing the sched.h #include in module.h
      recently, it makes sense again to remove other superfluous sched.h includes.
      There are quite a lot of files which include it but don't actually need
      anything defined in there.  Presumably these includes were once needed for
      macros that used to live in sched.h, but moved to other header files in the
      course of cleaning it up.
      
      To ease the pain, this time I did not fiddle with any header files and only
      removed #includes from .c-files, which tend to cause less trouble.
      
      Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
      arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
      allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
      configs in arch/arm/configs on arm.  I also checked that no new warnings were
      introduced by the patch (actually, some warnings are removed that were emitted
      by unnecessarily included header files).
      Signed-off-by: default avatarTim Schmielau <tim@physik3.uni-rostock.de>
      Acked-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cd354f1a
  2. 23 Jun, 2005 1 commit
    • Venkatesh Pallipadi's avatar
      [PATCH] Platform SMIs and their interferance with tsc based delay calibration · 8a9e1b0f
      Venkatesh Pallipadi authored
      
      Issue:
      Current tsc based delay_calibration can result in significant errors in
      loops_per_jiffy count when the platform events like SMIs
      (System Management Interrupts that are non-maskable) are present. This could
      lead to potential kernel panic(). This issue is becoming more visible with 2.6
      kernel (as default HZ is 1000) and on platforms with higher SMI handling
      latencies. During the boot time, SMIs are mostly used by BIOS (for things
      like legacy keyboard emulation).
      
      Description:
      The psuedocode for current delay calibration with tsc based delay looks like
      (0) Estimate a value for loops_per_jiffy
      (1) While (loops_per_jiffy estimate is accurate enough)
      (2)   wait for jiffy transition (jiffy1)
      (3)   Note down current tsc (tsc1)
      (4)   loop until tsc becomes tsc1 + loops_per_jiffy
      (5)   check whether jiffy changed since jiffy1 or not and refine
      loops_per_jiffy estimate
      
      Consider the following cases
      Case 1:
      If SMIs happen between (2) and (3) above, we can end up with a
      loops_per_jiffy value that is too low. This results in shorted delays and
      kernel can panic () during boot (Mostly at IOAPIC timer initialization
      timer_irq_works() as we don't have enough timer interrupts in a specified
      interval).
      
      Case 2:
      If SMIs happen between (3) and (4) above, then we can end up with a
      loops_per_jiffy value that is too high. And with current i386 code, too
      high lpj value (greater than 17M) can result in a overflow in
      delay.c:__const_udelay() again resulting in shorter delay and panic().
      
      Solution:
      The patch below makes the calibration routine aware of asynchronous events
      like SMIs. We increase the delay calibration time and also identify any
      significant errors (greater than 12.5%) in the calibration and notify it to
      user.
      
      Patch below changes both i386 and x86-64 architectures to use this
      new and improved calibrate_delay_direct() routine.
      Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: default avatarAdrian Bunk <bunk@stusta.de>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      8a9e1b0f
  3. 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