diff options
author | Dave Hansen <dave.hansen@linux.intel.com> | 2015-06-07 11:37:01 -0700 |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-06-09 12:24:30 +0200 |
commit | a84eeaa96b36a03188e1423349669c108d3a4bd7 (patch) | |
tree | 13f38f8a3859b26458b21cce4cf5ee22851313fb /arch/mips/net | |
parent | 04cd027bcba1ead7bfe39e7f1c6f4d993c4c3323 (diff) |
x86/mpx: Use the new get_xsave_field_ptr()API
The MPX registers (bndcsr/bndcfgu/bndstatus) are not directly
accessible via normal instructions. They essentially act as
if they were floating point registers and are saved/restored
along with those registers.
There are two main paths in the MPX code where we care about
the contents of these registers:
1. #BR (bounds) faults
2. the prctl() code where we are setting MPX up
Both of those paths _might_ be called without the FPU having
been used. That means that 'tsk->thread.fpu.state' might
never be allocated.
Also, fpu_save_init() is not preempt-safe. It was a bug to
call it without disabling preemption. The new
get_xsave_addr() calls unlazy_fpu() instead and properly
disables preemption.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave@sr71.net>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Cc: bp@alien8.de
Link: http://lkml.kernel.org/r/20150607183701.BC0D37CF@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/mips/net')
0 files changed, 0 insertions, 0 deletions