linux-kernel - [PATCH] i386: remove struct thread

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Message-ID: <20090324203805.GA24382@x200.localdomain>
Date:	Tue, 24 Mar 2009 23:38:06 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, jeremy@...p.org
Subject: [PATCH] i386: remove struct thread_struct::fs

After commit 464d1a78fbf8cf6c7fd970e7b3e2db50a320ce28 aka
"[PATCH] i386: Convert i386 PDA code to use %fs"
%fs saved during context switch moved from thread_struct to pt_regs.

Ifdef it on i386.

I don't understand why .fs (OK, .gs first) initializer was added, kernel
clearly stopped touching it after the patch.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 arch/x86/include/asm/processor.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -403,7 +403,9 @@ struct thread_struct {
 	unsigned short		gsindex;
 #endif
 	unsigned long		ip;
+#ifdef CONFIG_X86_64
 	unsigned long		fs;
+#endif
 	unsigned long		gs;
 	/* Hardware debugging registers: */
 	unsigned long		debugreg0;
@@ -847,7 +849,6 @@ static inline void spin_lock_prefetch(const void *x)
 	.vm86_info		= NULL,					  \
 	.sysenter_cs		= __KERNEL_CS,				  \
 	.io_bitmap_ptr		= NULL,					  \
-	.fs			= __KERNEL_PERCPU,			  \
 }
 
 /*
--
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