linux-kernel - [tip:x86/fpu] x86/fpu: Don't allocate fpu->state for swapper/0

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Message-ID: <tip-4bd5bf8c85e6bca5be9e7c4b3d7ad1942ae323f3@git.kernel.org>
Date:	Mon, 23 Mar 2015 05:22:35 -0700
From:	tip-bot for Oleg Nesterov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	quentin.casasnovas@...cle.com, linux-kernel@...r.kernel.org,
	riel@...hat.com, torvalds@...ux-foundation.org, priikone@....fi,
	oleg@...hat.com, bp@...e.de, sbsiddha@...il.com,
	luto@...capital.net, hpa@...or.com, tglx@...utronix.de,
	mingo@...nel.org, dave.hansen@...el.com, fenghua.yu@...el.com
Subject: [tip:x86/fpu] x86/fpu: Don't allocate fpu->state for swapper/0

Commit-ID:  4bd5bf8c85e6bca5be9e7c4b3d7ad1942ae323f3
Gitweb:     http://git.kernel.org/tip/4bd5bf8c85e6bca5be9e7c4b3d7ad1942ae323f3
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Fri, 13 Mar 2015 19:27:16 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 23 Mar 2015 10:13:59 +0100

x86/fpu: Don't allocate fpu->state for swapper/0

Now that kthreads do not use FPU until they get executed, swapper/0
doesn't need to allocate fpu->state.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Pekka Riikonen <priikone@....fi>
Cc: Quentin Casasnovas <quentin.casasnovas@...cle.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Suresh Siddha <sbsiddha@...il.com>
Link: http://lkml.kernel.org/r/20150313182716.GB8249@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/xsave.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 65c29b0..ada8df7b 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -680,8 +680,6 @@ void xsave_init(void)
 
 static inline void __init eager_fpu_init_bp(void)
 {
-	current->thread.fpu.state =
-	    alloc_bootmem_align(xstate_size, __alignof__(struct xsave_struct));
 	if (!init_xstate_buf)
 		setup_init_fpu_buf();
 }
--
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