• Linus Torvalds's avatar
    Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · c6f21243
    Linus Torvalds authored
    Pull x86 vdso changes from Peter Anvin:
     "This is the revamp of the 32-bit vdso and the associated cleanups.
    
      This adds timekeeping support to the 32-bit vdso that we already have
      in the 64-bit vdso.  Although 32-bit x86 is legacy, it is likely to
      remain in the embedded space for a very long time to come.
    
      This removes the traditional COMPAT_VDSO support; the configuration
      variable is reused for simply removing the 32-bit vdso, which will
      produce correct results but obviously suffer a performance penalty.
      Only one beta version of glibc was affected, but that version was
      unfortunately included in one OpenSUSE release.
    
      This is not the end of the vdso cleanups.  Stefani and Andy have
      agreed to continue work for the next kernel cycle; in fact Andy has
      already produced another set of cleanups that came too late for this
      cycle.
    
      An incidental, but arguably important, change is that this ensures
      that unused space in the VVAR page is properly zeroed.  It wasn't
      before, and would contain whatever garbage was left in memory by BIOS
      or the bootloader.  Since the VVAR page is accessible to user space
      this had the potential of information leaks"
    
    * 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
      x86, vdso: Fix the symbol versions on the 32-bit vDSO
      x86, vdso, build: Don't rebuild 32-bit vdsos on every make
      x86, vdso: Actually discard the .discard sections
      x86, vdso: Fix size of get_unmapped_area()
      x86, vdso: Finish removing VDSO32_PRELINK
      x86, vdso: Move more vdso definitions into vdso.h
      x86: Load the 32-bit vdso in place, just like the 64-bit vdsos
      x86, vdso32: handle 32 bit vDSO larger one page
      x86, vdso32: Disable stack protector, adjust optimizations
      x86, vdso: Zero-pad the VVAR page
      x86, vdso: Add 32 bit VDSO time support for 64 bit kernel
      x86, vdso: Add 32 bit VDSO time support for 32 bit kernel
      x86, vdso: Patch alternatives in the 32-bit VDSO
      x86, vdso: Introduce VVAR marco for vdso32
      x86, vdso: Cleanup __vdso_gettimeofday()
      x86, vdso: Replace VVAR(vsyscall_gtod_data) by gtod macro
      x86, vdso: __vdso_clock_gettime() cleanup
      x86, vdso: Revamp vclock_gettime.c
      mm: Add new func _install_special_mapping() to mmap.c
      x86, vdso: Make vsyscall_gtod_data handling x86 generic
      ...
    c6f21243
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