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x86/fpu: Clean up regset functions 

Clean up various regset handlers: use the 'fpu' pointer which
is available in most cases.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
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: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-24 10:11:24 +02:00
parent 9254aaa0fe
commit 8dcea8db79
1 changed files with 10 additions and 9 deletions
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19
arch/x86/kernel/fpu/core.c
View File

@ -438,7 +438,7 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
sanitize_i387_state(target);
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.state->fxsave, 0, -1);
&fpu->state->fxsave, 0, -1);
}
int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
@ -458,19 +458,19 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
sanitize_i387_state(target);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.state->fxsave, 0, -1);
&fpu->state->fxsave, 0, -1);
/*
* mxcsr reserved bits must be masked to zero for security reasons.
*/
target->thread.fpu.state->fxsave.mxcsr &= mxcsr_feature_mask;
fpu->state->fxsave.mxcsr &= mxcsr_feature_mask;
/*
* update the header bits in the xsave header, indicating the
* presence of FP and SSE state.
*/
if (cpu_has_xsave)
target->thread.fpu.state->xsave.xsave_hdr.xstate_bv |= XSTATE_FPSSE;
fpu->state->xsave.xsave_hdr.xstate_bv |= XSTATE_FPSSE;
return ret;
}
@ -490,7 +490,7 @@ int xstateregs_get(struct task_struct *target, const struct user_regset *regset,
if (ret)
return ret;
xsave = &target->thread.fpu.state->xsave;
xsave = &fpu->state->xsave;
/*
* Copy the 48bytes defined by the software first into the xstate
@ -521,7 +521,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
if (ret)
return ret;
xsave = &target->thread.fpu.state->xsave;
xsave = &fpu->state->xsave;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
/*
@ -533,6 +533,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
* These bits must be zero.
*/
memset(&xsave->xsave_hdr.reserved, 0, 48);
return ret;
}
@ -690,7 +691,7 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset,
if (!cpu_has_fxsr)
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.state->fsave, 0,
&fpu->state->fsave, 0,
-1);
sanitize_i387_state(target);
@ -724,7 +725,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
if (!cpu_has_fxsr)
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.state->fsave, 0,
&fpu->state->fsave, 0,
-1);
if (pos > 0 || count < sizeof(env))
@ -739,7 +740,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
* presence of FP.
*/
if (cpu_has_xsave)
target->thread.fpu.state->xsave.xsave_hdr.xstate_bv |= XSTATE_FP;
fpu->state->xsave.xsave_hdr.xstate_bv |= XSTATE_FP;
return ret;
}