1. 12 Jun, 2013 1 commit
  2. 11 Jun, 2013 2 commits
  3. 10 Jun, 2013 1 commit
  4. 07 Jun, 2013 6 commits
  5. 01 Jun, 2013 4 commits
  6. 31 May, 2013 19 commits
  7. 30 May, 2013 2 commits
    • Pekka Riikonen's avatar
      x86: Allow FPU to be used at interrupt time even with eagerfpu · 5187b28f
      Pekka Riikonen authored
      With the addition of eagerfpu the irq_fpu_usable() now returns false
      negatives especially in the case of ksoftirqd and interrupted idle task,
      two common cases for FPU use for example in networking/crypto.  With
      eagerfpu=off FPU use is possible in those contexts.  This is because of
      the eagerfpu check in interrupted_kernel_fpu_idle():
        * For now, with eagerfpu we will return interrupted kernel FPU
        * state as not-idle. TBD: Ideally we can change the return value
        * to something like __thread_has_fpu(current). But we need to
        * be careful of doing __thread_clear_has_fpu() before saving
        * the FPU etc for supporting nested uses etc. For now, take
        * the simple route!
       	if (use_eager_fpu())
       		return 0;
      As eagerfpu is automatically "on" on those CPUs that also have the
      features like AES-NI this patch changes the eagerfpu check to return 1 in
      case the kernel_fpu_begin() has not been said yet.  Once it has been the
      __thread_has_fpu() will start returning 0.
      Notice that with eagerfpu the __thread_has_fpu is always true initially.
      FPU use is thus always possible no matter what task is under us, unless
      the state has already been saved with kernel_fpu_begin().
      [ hpa: this is a performance regression, not a correctness regression,
        but since it can be quite serious on CPUs which need encryption at
        interrupt time I am marking this for urgent/stable. ]
      Signed-off-by: default avatarPekka Riikonen <priikone@iki.fi>
      Link: http://lkml.kernel.org/r/alpine.GSO.2.00.1305131356320.18@git.silcnet.org
      Cc: <stable@vger.kernel.org> v3.7+
      Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
    • Jan Beulich's avatar
      x86, crc32-pclmul: Fix build with older binutils · 2baad612
      Jan Beulich authored
      binutils prior to 2.18 (e.g. the ones found on SLE10) don't support
      assembling PEXTRD, so a macro based approach like the one for PCLMULQDQ
      in the same file should be used.
      This requires making the helper macros capable of recognizing 32-bit
      general purpose register operands.
      [ hpa: tagging for stable as it is a low risk build fix ]
      Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
      Link: http://lkml.kernel.org/r/51A6142A02000078000D99D8@nat28.tlf.novell.com
      Cc: Alexander Boyko <alexander_boyko@xyratex.com>
      Cc: Herbert Xu <herbert@gondor.apana.org.au>
      Cc: Huang Ying <ying.huang@intel.com>
      Cc: <stable@vger.kernel.org> v3.9
      Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
  8. 29 May, 2013 5 commits