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>

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 8ea9ce0..07c8a44 100644 (file)
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -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;
 }