linux-kernel - Re: [PATCH 01/10] Makefile: Add option CONFIG_DISABLE_GCC_AUTOMATIC

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Date:	Sun, 9 Sep 2012 14:25:44 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ezequiel Garcia <elezegarcia@...il.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michal Marek <mmarek@...e.cz>
Subject: Re: [PATCH 01/10] Makefile: Add option
 CONFIG_DISABLE_GCC_AUTOMATIC_INLINING

On Sat, 8 Sep 2012, Ezequiel Garcia wrote:

> diff --git a/Makefile b/Makefile
> index ddf5be9..df6045a 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -561,6 +561,10 @@ else
>  KBUILD_CFLAGS	+= -O2
>  endif
>  
> +ifdef CONFIG_DISABLE_GCC_AUTOMATIC_INLINING
> +KBUILD_CFLAGS	+= -fno-inline-small-functions

This isn't the only option that controls automatic inlining of functions, 
see indirect-inlining, inline-functions, and inline-functions-called-once.

> +endif
> +
>  include $(srctree)/arch/$(SRCARCH)/Makefile
>  
>  ifdef CONFIG_READABLE_ASM
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 2403a63..c8fd50f 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1265,6 +1265,17 @@ config LATENCYTOP
>  source mm/Kconfig.debug
>  source kernel/trace/Kconfig
>  
> +config DISABLE_GCC_AUTOMATIC_INLINING
> +	bool "Disable gcc automatic inlining"
> +	depends on TRACING
> +	help
> +	  This option tells gcc he's not allowed to inline functions automatically,
> +	  when they are not marked as 'inline'.
> +	  In turn, this enables to trace an event with an accurate call site.
> +	  Of course, the resultant kernel is slower and slightly smaller.
> +
> +	  Select this option only if you want to trace call sites accurately.
> +
>  config PROVIDE_OHCI1394_DMA_INIT
>  	bool "Remote debugging over FireWire early on boot"
>  	depends on PCI && X86
> -- 
> 1.7.8.6
> 
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