diff options
| -rw-r--r-- | arch/x86/include/asm/fpu/internal.h | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index 1352d380bd46..99690bed920a 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -232,7 +232,7 @@ static inline void copy_fxregs_to_kernel(struct fpu *fpu) * This function is called only during boot time when x86 caps are not set * up and alternative can not be used yet. */ -static inline int copy_xregs_to_kernel_booting(struct xregs_state *xstate) +static inline void copy_xregs_to_kernel_booting(struct xregs_state *xstate) { u64 mask = -1; u32 lmask = mask; @@ -253,14 +253,16 @@ static inline int copy_xregs_to_kernel_booting(struct xregs_state *xstate) xstate_fault(err) : "D" (xstate), "m" (*xstate), "a" (lmask), "d" (hmask), "0" (err) : "memory"); - return err; + + /* We should never fault when copying to a kernel buffer: */ + WARN_ON_FPU(err); } /* * This function is called only during boot time when x86 caps are not set * up and alternative can not be used yet. */ -static inline int copy_kernel_to_xregs_booting(struct xregs_state *xstate, u64 mask) +static inline void copy_kernel_to_xregs_booting(struct xregs_state *xstate, u64 mask) { u32 lmask = mask; u32 hmask = mask >> 32; @@ -280,13 +282,15 @@ static inline int copy_kernel_to_xregs_booting(struct xregs_state *xstate, u64 m xstate_fault(err) : "D" (xstate), "m" (*xstate), "a" (lmask), "d" (hmask), "0" (err) : "memory"); - return err; + + /* We should never fault when copying from a kernel buffer: */ + WARN_ON_FPU(err); } /* * Save processor xstate to xsave area. */ -static inline int copy_xregs_to_kernel(struct xregs_state *xstate) +static inline void copy_xregs_to_kernel(struct xregs_state *xstate) { u64 mask = -1; u32 lmask = mask; @@ -319,13 +323,14 @@ static inline int copy_xregs_to_kernel(struct xregs_state *xstate) : "0" (err) : "memory"); - return err; + /* We should never fault when copying to a kernel buffer: */ + WARN_ON_FPU(err); } /* * Restore processor xstate from xsave area. */ -static inline int copy_kernel_to_xregs(struct xregs_state *xstate, u64 mask) +static inline void copy_kernel_to_xregs(struct xregs_state *xstate, u64 mask) { u32 lmask = mask; u32 hmask = mask >> 32; @@ -347,7 +352,8 @@ static inline int copy_kernel_to_xregs(struct xregs_state *xstate, u64 mask) : "0" (err) : "memory"); - return err; + /* We should never fault when copying from a kernel buffer: */ + WARN_ON_FPU(err); } /* @@ -433,12 +439,15 @@ static inline int copy_fpregs_to_fpstate(struct fpu *fpu) static inline int __copy_fpstate_to_fpregs(struct fpu *fpu) { - if (use_xsave()) - return copy_kernel_to_xregs(&fpu->state.xsave, -1); - else if (use_fxsr()) - return copy_kernel_to_fxregs(&fpu->state.fxsave); - else - return copy_kernel_to_fregs(&fpu->state.fsave); + if (use_xsave()) { + copy_kernel_to_xregs(&fpu->state.xsave, -1); + return 0; + } else { + if (use_fxsr()) + return copy_kernel_to_fxregs(&fpu->state.fxsave); + else + return copy_kernel_to_fregs(&fpu->state.fsave); + } } static inline int copy_fpstate_to_fpregs(struct fpu *fpu) |