On Mon, 2006-08-07 at 07:30 +0200, Andi Kleen wrote:

quoted

===================================================================

--- /dev/null
+++ b/include/asm-i386/no_paravirt.h

I can't say I like the name. After all that should be the normal
case for a long time now ... native? normal? bareiron?

Yeah, I don't like it much either.  native.h doesn't say what the
alternative is.  native_paravirt.h is kind of contradictory.

Also I would prefer if you split this file up a bit - the old
processor/system/irqflags split wasn't too bad.

In the paravirt case, they all come into one ops structure, which has to
be declared in one place.

Of course, those headers can do:

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
...
#endif

I'll try this and see what happens.  Playing with the x86 headers can be
extremely hairy 8(

quoted

+
+/*
+ * Set IOPL bits in EFLAGS from given mask
+ */
+static inline void set_iopl_mask(unsigned mask)

This function can be completely written in C using local_save_flags()/local_restore_flags()
Please do that. I guess it's still a good idea to keep it separated
though because it might allow other optimizations.

e.g. i've been thinking about special casing IF changes in save/restore flags 
to optimize CPUs which have slow pushf/popf. If you already make sure
all non IF manipulations of flags are separated that would help.

...

quoted

+
+/*
+ * Clear and set 'TS' bit respectively
+ */

The comment seems out of date (no set TS)

quoted

+#define clts() __asm__ __volatile__ ("clts")
+#define read_cr0() ({ \
+	unsigned int __dummy; \
+	__asm__ __volatile__( \

Maybe it's just me, but can't you just drop all these __s around
asm and volatile? They are completely useless as far I know. 

Also the assembly will be easier readable if you just keep it on a single 
line for the simple ones.

I'm just shuffling code here, and if the other approach works, I won't
even be doing that.

But I'm happy to submit a separate patch which cleans these...

Thanks!
Rusty.
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