linux-kernel - [PATCH] Introduce load

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Message-Id: <1173767976.10618.50.camel@localhost.localdomain>
Date:	Tue, 13 Mar 2007 17:39:36 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andi Kleen <ak@....de>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] Introduce load_TLS to the "for" loop.

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>

diff -r de5618b5e562 include/asm-x86_64/desc.h
--- a/include/asm-x86_64/desc.h	Tue Mar 13 11:41:55 2007 +1100
+++ b/include/asm-x86_64/desc.h	Tue Mar 13 16:09:56 2007 +1100
@@ -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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