linux-kernel - [PATCH] [25/48] x86_64: Introduce load

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Date:	Sun, 29 Apr 2007 12:53:14 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [25/48] x86_64: Introduce load_TLS to the "for" loop.


From: Rusty Russell <rusty@...tcorp.com.au>

GCC (4.1 at least) unrolls it anyway, but I can't believe this code
was ever justifiable.  (I've also submitted a patch which cleans up
i386, which is even uglier).

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Andi Kleen <ak@...e.de>
Cc: Andi Kleen <ak@...e.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 include/asm-x86_64/desc.h |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

Index: linux/include/asm-x86_64/desc.h
===================================================================
--- linux.orig/include/asm-x86_64/desc.h
+++ linux/include/asm-x86_64/desc.h
@@ -135,16 +135,13 @@ static inline void set_ldt_desc(unsigned
 	(info)->useable		== 0	&& \
 	(info)->lm		== 0)
 
-#if TLS_SIZE != 24
-# error update this code.
-#endif
-
 static inline void load_TLS(struct thread_struct *t, unsigned int cpu)
 {
+	unsigned int i;
 	u64 *gdt = (u64 *)(cpu_gdt(cpu) + GDT_ENTRY_TLS_MIN);
-	gdt[0] = t->tls_array[0];
-	gdt[1] = t->tls_array[1];
-	gdt[2] = t->tls_array[2];
+
+	for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++)
+		gdt[i] = t->tls_array[i];
 } 
 
 /*
-
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