linux-kernel - Re: [PATCH] kprobes: Enable tracing for mololithic kernel images

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Date:   Thu, 9 Jun 2022 08:47:38 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Jarkko Sakkinen <jarkko@...fian.com>
Cc:     linux-kernel@...r.kernel.org,
        Nathaniel McCallum <nathaniel@...fian.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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Subject: Re: [PATCH] kprobes: Enable tracing for mololithic kernel images

On Wed, Jun 08, 2022 at 02:59:27AM +0300, Jarkko Sakkinen wrote:
> diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> index 553866751e1a..d2bb954cd54f 100644
> --- a/arch/arm/kernel/Makefile
> +++ b/arch/arm/kernel/Makefile
> @@ -44,6 +44,11 @@ obj-$(CONFIG_CPU_IDLE)		+= cpuidle.o
>  obj-$(CONFIG_ISA_DMA_API)	+= dma.o
>  obj-$(CONFIG_FIQ)		+= fiq.o fiqasm.o
>  obj-$(CONFIG_MODULES)		+= armksyms.o module.o
> +ifeq ($(CONFIG_MODULES),y)
> +obj-y				+= module_alloc.o
> +else
> +obj-$(CONFIG_KPROBES)		+= module_alloc.o
> +endif

Doesn't:

obj-$(CONFIG_MODULES)		+= module_alloc.o
obj-$(CONFIG_KPROBES)		+= module_alloc.o

work just as well? The kbuild modules.rst documentation says:

        The order of files in $(obj-y) is significant.  Duplicates in
        the lists are allowed: the first instance will be linked into
        built-in.a and succeeding instances will be ignored.

so you should be fine... or the documentation is wrong!

-- 
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