linux-kernel - Re: [patch 1/7] Immediate Values - Architecture Independent Code

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Message-Id: <200709181847.22905.vda.linux@googlemail.com>
Date:	Tue, 18 Sep 2007 18:47:22 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/7] Immediate Values - Architecture Independent Code

On Monday 17 September 2007 19:42, Mathieu Desnoyers wrote:
> Index: linux-2.6-lttng/include/asm-generic/vmlinux.lds.h
> ===================================================================
> --- linux-2.6-lttng.orig/include/asm-generic/vmlinux.lds.h	2007-09-17 13:25:06.000000000 -0400
> +++ linux-2.6-lttng/include/asm-generic/vmlinux.lds.h	2007-09-17 13:35:50.000000000 -0400
> @@ -122,6 +122,13 @@
>  		VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;	\
>  	}								\
>  									\
> +	/* Immediate values: pointers */				\
> +	__immediate : AT(ADDR(__immediate) - LOAD_OFFSET) {		\
> +		VMLINUX_SYMBOL(__start___immediate) = .;		\
> +		*(__immediate)						\
> +		VMLINUX_SYMBOL(__stop___immediate) = .;			\
> +	}								\
> +									\

Why do you need an output section for that? IOW: will this work too?

.data : ... { 
...

		VMLINUX_SYMBOL(__start___immediate) = .;		\
		*(__immediate)						\
		VMLINUX_SYMBOL(__stop___immediate) = .;			\
...
}


> Index: linux-2.6-lttng/kernel/module.c
> ===================================================================
> --- linux-2.6-lttng.orig/kernel/module.c	2007-09-17 13:25:06.000000000 -0400
> +++ linux-2.6-lttng/kernel/module.c	2007-09-17 13:35:51.000000000 -0400
> @@ -33,6 +33,7 @@
>  #include <linux/cpu.h>
>  #include <linux/moduleparam.h>
>  #include <linux/errno.h>
> +#include <linux/immediate.h>
>  #include <linux/err.h>
>  #include <linux/vermagic.h>
>  #include <linux/notifier.h>
> @@ -1717,6 +1718,7 @@ static struct module *load_module(void _
>  	unsigned int unusedcrcindex;
>  	unsigned int unusedgplindex;
>  	unsigned int unusedgplcrcindex;
> +	unsigned int immediateindex;
>  	struct module *mod;
>  	long err = 0;
>  	void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
> @@ -1813,6 +1815,7 @@ static struct module *load_module(void _
>  #ifdef ARCH_UNWIND_SECTION_NAME
>  	unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
>  #endif
> +	immediateindex = find_sec(hdr, sechdrs, secstrings, "__immediate");


Do you need to frame immediateindex by #ifdef CONFIG_IMMEDIATE / #endif?
--
vda
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