linux-kernel - Re: [PATCH] x86: fix unconditional arch/x86/kernel/pcspeaker.c?compiling

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Date:	Tue, 22 Jan 2008 15:39:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Michael Opdenacker <michael-lists@...e-electrons.com>,
	linux-kernel@...r.kernel.org, Linux-tiny@...enic.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86: fix unconditional
	arch/x86/kernel/pcspeaker.c?compiling

* Matt Mackall <mpm@...enic.com> wrote:

> > btw., are there any pending arch/x86 bits in -tiny? (stupid 
> > question: were can i get the most uptodate version of -tiny from?)
> 
> It's not a stupid question. I dropped updating the tree regulary some 
> time ago to focus on merging bits and then got a bit side-tracked by 
> this little thing called "version control".
> 
> Michael is attempting to get the tree started again and has put a 
> quilt up here:
> 
> http://elinux.org/images/3/3c/Tiny-quilt-2.6.23-0.tar.bz2

cool! A few comments about the patches that affect arch/x86:

dmi_blacklist.patch:

  +#ifdef CONFIG_DMI_SCAN
          dmi_scan_machine();
  +#endif

put that #ifdef into the include file and make it an inlined NOP in the 
!DMI_SCAN case. That de-#ifdef-ifies the .c files.

cpu-support.patch: ditto.

mtrr.patch: ditto.

inflate-error.patch: please use:

   quilt refresh --diffstat --sort --no-timestamps -p 1

when generating patches, to make them reviewable, uniform and 
noise-free.

no-doublefault.patch: looks ok. Please add proper metadata and submit to 
lkml.

sbf.patch: looks ok.

sysenter.patch:

+#ifdef CONFIG_SYSENTER
        sysenter_setup();
        enable_sep_cpu();
+#endif

hide these #ifdefs in the include file. (as it already does) Looks ok 
otherwise.

threadinfo-ool.patch: doesnt this break the scheduler? Had something 
like this in -rt, i turned 'current' into a const actually, but had 
trouble with keeping from gcc to do the right thing in sched.c. I guess 
we could live with current_non_const() that gets it from assembly. (and 
hence gcc wont be able to optimize it away in the middle of the 
context-switch) But when done properly, this is both a nice, measurable 
speedup on UP, and a nice space-saver.

tiny-cflags.patch: obsolete? Isnt CFLAGS already extendable? Question to 
Sam i guess.

tsc.patch: look ok. needs x86.git porting.

	Ingo
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