linux-kernel - [PATCH v1 2/4] x86/fpu/xstate: Simplify xstate_calculate

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Date:   Wed, 21 Jun 2023 05:09:40 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        andrew.cooper3@...rix.com, chang.seok.bae@...el.com
Subject: [PATCH v1 2/4] x86/fpu/xstate: Simplify xstate_calculate_size()

This size calculation code uses xfeatures_get_offset() only for the
compacted format. But, it is capable of handling both formats. Use it
for simpler and more concise code.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/kernel/fpu/xstate.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 2f03acc47f62..d488621b280e 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -563,14 +563,11 @@ static bool __init check_xstate_against_struct(int nr)
 static unsigned int xstate_calculate_size(u64 xfeatures, bool compacted)
 {
 	unsigned int topmost = fls64(xfeatures) -  1;
-	unsigned int offset = xstate_offsets[topmost];
 
 	if (topmost <= XFEATURE_SSE)
 		return sizeof(struct xregs_state);
 
-	if (compacted)
-		offset = xfeature_get_offset(xfeatures, topmost);
-	return offset + xstate_sizes[topmost];
+	return xfeature_get_offset(xfeatures, topmost) + xstate_sizes[topmost];
 }
 
 /*
-- 
2.34.1