linux-kernel - Re: [PATCH v4 4/7] arch, ftrace: For KASAN put hard/soft IRQ entries into separate sections

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Date:	Wed, 2 Mar 2016 12:41:10 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexander Potapenko <glider@...gle.com>
Cc:	adech.fo@...il.com, cl@...ux.com, dvyukov@...gle.com,
	akpm@...ux-foundation.org, ryabinin.a.a@...il.com,
	iamjoonsoo.kim@....com, js1304@...il.com, kcc@...gle.com,
	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v4 4/7] arch, ftrace: For KASAN put hard/soft IRQ
 entries into separate sections

On Fri, 26 Feb 2016 17:48:44 +0100
Alexander Potapenko <glider@...gle.com> wrote:

> KASAN needs to know whether the allocation happens in an IRQ handler.
> This lets us strip everything below the IRQ entry point to reduce the
> number of unique stack traces needed to be stored.
> 
> Move the definition of __irq_entry to <linux/interrupt.h> so that the
> users don't need to pull in <linux/ftrace.h>. Also introduce the
> __softirq_entry macro which is similar to __irq_entry, but puts the
> corresponding functions to the .softirqentry.text section.
> 
> Signed-off-by: Alexander Potapenko <glider@...gle.com>

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> ---
> v2: - per request from Steven Rostedt, moved the declarations of __softirq_entry
> and __irq_entry to <linux/interrupt.h>
> 
> v3: - minor description changes
> ---
>  arch/arm/kernel/vmlinux.lds.S        |  1 +
>  arch/arm64/kernel/vmlinux.lds.S      |  1 +
>  arch/blackfin/kernel/vmlinux.lds.S   |  1 +
>  arch/c6x/kernel/vmlinux.lds.S        |  1 +
>  arch/metag/kernel/vmlinux.lds.S      |  1 +
>  arch/microblaze/kernel/vmlinux.lds.S |  1 +
>  arch/mips/kernel/vmlinux.lds.S       |  1 +
>  arch/nios2/kernel/vmlinux.lds.S      |  1 +
>  arch/openrisc/kernel/vmlinux.lds.S   |  1 +
>  arch/parisc/kernel/vmlinux.lds.S     |  1 +
>  arch/powerpc/kernel/vmlinux.lds.S    |  1 +
>  arch/s390/kernel/vmlinux.lds.S       |  1 +
>  arch/sh/kernel/vmlinux.lds.S         |  1 +
>  arch/sparc/kernel/vmlinux.lds.S      |  1 +
>  arch/tile/kernel/vmlinux.lds.S       |  1 +
>  arch/x86/kernel/vmlinux.lds.S        |  1 +
>  include/asm-generic/vmlinux.lds.h    | 12 +++++++++++-
>  include/linux/ftrace.h               | 11 -----------
>  include/linux/interrupt.h            | 20 ++++++++++++++++++++
>  kernel/softirq.c                     |  2 +-
>  kernel/trace/trace_functions_graph.c |  1 +
>  21 files changed, 49 insertions(+), 13 deletions(-)
> 
>