diff options
| author | Fenghua Yu <fenghua.yu@intel.com> | 2016-05-20 10:47:05 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-18 10:10:18 +0200 |
| commit | a1141e0b5ca6ee3e5e35d5f1a310a5ecb9c96ce5 (patch) | |
| tree | 3f6562ed55d70ddb83adcdcada133b57c3aa9cf7 /arch/x86/kernel/fpu/init.c | |
| parent | d1898b733619bd46194bd25aa6452d238ff2dc4e (diff) | |
| download | linux-a1141e0b5ca6ee3e5e35d5f1a310a5ecb9c96ce5.tar.bz2 | |
x86/fpu/xstate: Define and use 'fpu_user_xstate_size'
The kernel xstate area can be in standard or compacted format;
it is always in standard format for user mode. When XSAVES is
enabled, the kernel uses the compacted format and it is necessary
to use a separate fpu_user_xstate_size for signal/ptrace frames.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
[ Rebased the patch and cleaned up the naming. ]
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.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: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/8756ec34dabddfc727cda5743195eb81e8caf91c.1463760376.git.yu-cheng.yu@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/fpu/init.c')
| -rw-r--r-- | arch/x86/kernel/fpu/init.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c index aacfd7a82cec..5b1928c0aad4 100644 --- a/arch/x86/kernel/fpu/init.c +++ b/arch/x86/kernel/fpu/init.c @@ -195,7 +195,7 @@ static void __init fpu__init_task_struct_size(void) } /* - * Set up the xstate_size based on the legacy FPU context size. + * Set up the user and kernel xstate_size based on the legacy FPU context size. * * We set this up first, and later it will be overwritten by * fpu__init_system_xstate() if the CPU knows about xstates. @@ -226,6 +226,9 @@ static void __init fpu__init_system_xstate_size_legacy(void) else xstate_size = sizeof(struct fregs_state); } + + fpu_user_xstate_size = xstate_size; + /* * Quirk: we don't yet handle the XSAVES* instructions * correctly, as we don't correctly convert between |