From: "Chang S. Bae" <chang.seok.bae@intel.com>
Date: Wed, 24 Aug 2022 12:12:21 -0700
Subject: x86/fpu: Configure init_fpstate attributes orderly
Git-commit: c32d7cab57e3a77af8ecc17cde7a5761a26483b8
Patch-mainline: 6.1-rc2
References: jsc#PED-1816

The init_fpstate setup code is spread out and out of order. The init image
is recorded before its scoped features and the buffer size are determined.

Determine the scope of init_fpstate components and its size before
recording the init state. Also move the relevant code together.

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: neelnatu@google.com
Link: https://lore.kernel.org/r/20220824191223.1248-2-chang.seok.bae@intel.com
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 arch/x86/kernel/fpu/init.c   |    8 --------
 arch/x86/kernel/fpu/xstate.c |    6 +++++-
 2 files changed, 5 insertions(+), 9 deletions(-)

--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -210,13 +210,6 @@ static void __init fpu__init_system_xsta
 	fpstate_reset(&current->thread.fpu);
 }
 
-static void __init fpu__init_init_fpstate(void)
-{
-	/* Bring init_fpstate size and features up to date */
-	init_fpstate.size		= fpu_kernel_cfg.max_size;
-	init_fpstate.xfeatures		= fpu_kernel_cfg.max_features;
-}
-
 /*
  * Called on the boot CPU once per system bootup, to set up the initial
  * FPU state that is later cloned into all processes:
@@ -236,5 +229,4 @@ void __init fpu__init_system(struct cpui
 	fpu__init_system_xstate_size_legacy();
 	fpu__init_system_xstate(fpu_kernel_cfg.max_size);
 	fpu__init_task_struct_size();
-	fpu__init_init_fpstate();
 }
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -422,7 +422,7 @@ static void __init setup_init_fpu_buf(vo
 	setup_xstate_features();
 	print_xstate_features();
 
-	xstate_init_xcomp_bv(&init_fpstate.regs.xsave, fpu_kernel_cfg.max_features);
+	xstate_init_xcomp_bv(&init_fpstate.regs.xsave, init_fpstate.xfeatures);
 
 	/*
 	 * Init all the features state with header.xfeatures being 0x0
@@ -949,6 +949,10 @@ void __init fpu__init_system_xstate(unsi
 	update_regset_xstate_info(fpu_user_cfg.max_size,
 				  fpu_user_cfg.max_features);
 
+	/* Bring init_fpstate size and features up to date */
+	init_fpstate.size		= fpu_kernel_cfg.max_size;
+	init_fpstate.xfeatures		= fpu_kernel_cfg.max_features;
+
 	setup_init_fpu_buf();
 	setup_xstate_comp_offsets();
 	setup_supervisor_only_offsets();