linux-kernel - Type checking for write

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Message-ID: <44F78EF6.1060701@goop.org>
Date:	Thu, 31 Aug 2006 18:37:58 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...e.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Type checking for write_pda()

I just added type checking for assignments the PDA in the i386 PDA code.
Here's the x86-64 equivalent.  (Obviously this doesn't contain the latest
x86-64 PDA change.)

Signed-off-by: Jeremy Fitzhardinge <jeremy@...p.org>

diff -r 77945c3646ac include/asm-x86_64/pda.h
--- a/include/asm-x86_64/pda.h  Thu Aug 31 18:30:26 2006 -0700
+++ b/include/asm-x86_64/pda.h  Thu Aug 31 18:34:49 2006 -0700
@@ -47,6 +47,7 @@ extern void __bad_pda_field(void);
 
 #define pda_to_op(op,field,val) do { \
        typedef typeof_field(struct x8664_pda, field) T__; \
+       if (0) { T__ tmp__; tmp__ = (val); }                            \
        switch (sizeof_field(struct x8664_pda, field)) {                \
 case 2: \
 asm volatile(op "w %0,%%gs:%P1"::"ri" ((T__)val),"i"(pda_offset(field)):"memory"); break; \


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