linux-kernel - Re: [PATCH 1/2] Add thread_info_cache

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Date:	Fri, 18 Apr 2008 13:58:06 +1000
From:	Benjamin Herrenschmidt <benh@...abs.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...abs.org, takata@...ux-m32r.org,
	linux-m32r@...linux-m32r.org,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 1/2] Add thread_info_cache_init() to all archs


> > > otoh, if only one .c file will ever call this function then I think that
> > > all problems are solved by
> > > 
> > > a) moving the above ifdeffery into the .c file
> > > b) adding a comment explaining which arch file must provide the override
> > > c) directly including that file from within the .c file.
> > 
> > I can definitely do that. I have no problem either way. I can add to all
> > archs too, it's just that whatever way I choose, some people won't be
> > happy with it :-)
> > 
> > Anyway, I'll move the ifdeferry to init/main.c then.
> 
> Thanks ;)
> 
> I'm still wounded by my recent encounter with set_softirq_pending()
> and or_softirq_pending().

Well, looking there, I saw we already used weak symbols for that so what
about the patch below ? If you're ok, I'll re-send with appropriate sob
& adapted powerpc part.

Cheers,
Ben.

Index: linux-work/init/main.c
===================================================================
--- linux-work.orig/init/main.c	2008-03-26 10:39:25.000000000 +1100
+++ linux-work/init/main.c	2008-04-18 13:10:35.000000000 +1000
@@ -504,6 +504,10 @@ void __init __attribute__((weak)) smp_se
 {
 }
 
+void __init __attribute__((weak) thread_info_cache_init(void)
+{
+}
+
 asmlinkage void __init start_kernel(void)
 {
 	char * command_line;
@@ -623,6 +627,7 @@ asmlinkage void __init start_kernel(void
 	if (efi_enabled)
 		efi_enter_virtual_mode();
 #endif
+	thread_info_cache_init();
 	fork_init(num_physpages);
 	proc_caches_init();
 	buffer_init();
Index: linux-work/include/linux/sched.h
===================================================================
--- linux-work.orig/include/linux/sched.h	2008-04-02 09:47:56.000000000 +1100
+++ linux-work/include/linux/sched.h	2008-04-18 13:11:10.000000000 +1000
@@ -1893,6 +1893,8 @@ static inline unsigned long *end_of_stac
 
 #endif
 
+extern void thread_info_cache_init(void);
+
 /* set thread flags in other task's structures
  * - see asm/thread_info.h for TIF_xxxx flags available
  */


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