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Date: Wed, 20 Jan 2021 14:44:15 +0800 From: Yejune Deng <yejune.deng@...il.com> To: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com, dave.hansen@...ux.intel.com, yu-cheng.yu@...el.com, tony.luck@...el.com, fenghua.yu@...el.com, kan.liang@...ux.intel.com, viro@...iv.linux.org.uk Cc: linux-kernel@...r.kernel.org, yejune.deng@...il.com Subject: [PATCH] x86/fpu/xstate: calculate the number by sizeof and offsetof In fpstate_sanitize_xstate(), use memset and offsetof instead of '= 0', and use sizeof instead of a constant. Signed-off-by: Yejune Deng <yejune.deng@...il.com> --- arch/x86/kernel/fpu/xstate.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index 5d8047441a0a..2e75630c86e9 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -161,20 +161,16 @@ void fpstate_sanitize_xstate(struct fpu *fpu) * FP is in init state */ if (!(xfeatures & XFEATURE_MASK_FP)) { + memset(fx, 0, offsetof(struct fxregs_state, mxcsr)); + memset(fx->st_space, 0, sizeof(fx->st_space)); fx->cwd = 0x37f; - fx->swd = 0; - fx->twd = 0; - fx->fop = 0; - fx->rip = 0; - fx->rdp = 0; - memset(&fx->st_space[0], 0, 128); } /* * SSE is in init state */ if (!(xfeatures & XFEATURE_MASK_SSE)) - memset(&fx->xmm_space[0], 0, 256); + memset(fx->xmm_space, 0, sizeof(fx->xmm_space)); /* * First two features are FPU and SSE, which above we handled -- 2.29.0
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