linux-kernel - Re: [git pull] x86: declaration fixes

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Date:	Mon, 21 Jul 2008 20:04:39 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh <jaswinder@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] x86: declaration fixes

* Jaswinder Singh <jaswinder@...radead.org> wrote:

> Hello Ingo,
> 
> Please pull the declaration fixes for x86-tip from :
> 
> git://git.infradead.org/users/jaswinder/linux-2.6-tip.git

pulled this into tip/x86/prototypes, thanks Jaswinder.

Btw., when sending pull requests it's best to use git-request-pull. I.e. 
something like:

git-request-pull tip/master git://git.infradead.org/users/jaswinder/linux-2.6-tip.git

would have generated the proper output.

The changes still need some fixing though. For example, this change:

> 2. [PATCH] x86: process_32.c declare cpu_number before they get used

why is cpu_number moved over from smp.h to current.h? I think it's more 
logical in smp.h. If it's missing somewhere then add an #include 
<asm/smp.h> to that file?

also, this change:

+++ b/include/linux/timer.h
@@ -6,6 +6,10 @@
 #include <linux/stddef.h>
 #include <linux/debugobjects.h>

+#ifdef CONFIG_X86
+#include <asm/timer.h>
+#endif /* CONFIG_X86 */

is not really acceptable in a generic header, nor is:

--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -65,6 +67,10 @@ struct getcpu_cache;
 #include <linux/quota.h>
 #include <linux/key.h>

+#ifdef CONFIG_X86
+#include <asm/syscalls.h>
+#endif /* CONFIG_X86 */

i'd suggest we just do asm-x86/syscall.h and asm-x86/timer.h changes and 
add #include <asm/syscall.h> and #include <asm/timer.h> to the affected 
x86 .c files. Once every architecture has it, linux/syscall.h can be 
extended with an unconditional asm/syscall.h include.

Or, like Matthew has suggested, a 'complete' collection of all syscalls 
should be assembled into linux/syscall.h. In that case it has extra 
documentation value if there's an #ifdef CONFIG_X86 for certain 
syscalls. (say the LDT or VM86 syscalls make only sense on x86 
platforms)

another thing:

--- a/include/asm-x86/signal.h
+++ b/include/asm-x86/signal.h

+void do_notify_resume(struct pt_regs *, void *, __u32);
+

please add "extern" to each such prototype declaration. (the same is 
true for a handful of other prototypes you've added - please re-review 
and fix them)

 +#ifdef CONFIG_X86_32
  extern int timer_ack;
 -extern int no_timer_check;
  extern int recalibrate_cpu_khz(void);
 +#endif /* CONFIG_X86_32 */
 +
 +extern int no_timer_check;

hm, why was this needed?

	Ingo
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