1. 30 1月, 2008 5 次提交
  2. 13 11月, 2007 1 次提交
    • S
      x86: do not use $(ARCH) when not needed · d746d647
      Sam Ravnborg 提交于
      For x86 ARCH may say i386 or x86_64 and soon x86.
      Rely on CONFIG_X64_32 to select between 32/64 or just
      hardcode the value as appropriate.
      Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      d746d647
  3. 18 10月, 2007 1 次提交
  4. 15 10月, 2007 1 次提交
    • S
      kbuild: enable 'make CFLAGS=...' to add additional options to CC · a0f97e06
      Sam Ravnborg 提交于
      The variable CFLAGS is a wellknown variable and the usage by
      kbuild may result in unexpected behaviour.
      On top of that several people over time has asked for a way to
      pass in additional flags to gcc.
      
      This patch replace use of CFLAGS with KBUILD_CFLAGS all over the
      tree and enabling one to use:
      make CFLAGS=...
      to specify additional gcc commandline options.
      
      One usecase is when trying to find gcc bugs but other
      use cases has been requested too.
      
      Patch was tested on following architectures:
      alpha, arm, i386, x86_64, mips, sparc, sparc64, ia64, m68k
      
      Test was simple to do a defconfig build, apply the patch and check
      that nothing got rebuild.
      Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
      a0f97e06
  5. 11 10月, 2007 1 次提交
  6. 23 7月, 2007 1 次提交
  7. 22 7月, 2007 1 次提交
    • A
      x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu · 2aae950b
      Andi Kleen 提交于
      This implements new vDSO for x86-64.  The concept is similar
      to the existing vDSOs on i386 and PPC.  x86-64 has had static
      vsyscalls before,  but these are not flexible enough anymore.
      
      A vDSO is a ELF shared library supplied by the kernel that is mapped into
      user address space.  The vDSO mapping is randomized for each process
      for security reasons.
      
      Doing this was needed for clock_gettime, because clock_gettime
      always needs a syscall fallback and having one at a fixed
      address would have made buffer overflow exploits too easy to write.
      
      The vdso can be disabled with vdso=0
      
      It currently includes a new gettimeofday implemention and optimized
      clock_gettime(). The gettimeofday implementation is slightly faster
      than the one in the old vsyscall.  clock_gettime is significantly faster
      than the syscall for CLOCK_MONOTONIC and CLOCK_REALTIME.
      
      The new calls are generally faster than the old vsyscall.
      
      Advantages over the old x86-64 vsyscalls:
      - Extensible
      - Randomized
      - Cleaner
      - Easier to virtualize (the old static address range previously causes
      overhead e.g. for Xen because it has to create special page tables for it)
      
      Weak points:
      - glibc support still to be written
      
      The VM interface is partly based on Ingo Molnar's i386 version.
      
      Includes compile fix from Joachim Deguara
      Signed-off-by: NAndi Kleen <ak@suse.de>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      2aae950b