Re: Geode-GX1 processor in 2.6.21

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> > In arch/i386/kernel/cpu/cyrix.c function geode_configure() tries to enable 
> > the "suspend on halt power saving feature". This is the line:
> > 
> > 	setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);

That will go wrong

> > #define setCx86(reg, data) do { \
> >          outb((reg), 0x22); \
> >          outb((data), 0x23); \
> > } while (0)
> > 
> > Maybe the compiler does the wrong thing if someone uses these macros in the 
> > same instruction?
> 
> Sounds quite likely.

The problem is the macro evaluates to

	outb(reg, 0x22);
	[Then the getCx86]
	outb(data, 0x23);

which isn't valid for 6x86 control. Looks like someone overoptimised it.

Either make it "inline" or split it up and it'll work

> Also, it would probably be good to convert these macros into inline functions
> in this header.

Agreed - they must be issued in order in the right way as they are CPU
level magic.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux