linux-kernel - Re: [RFC patch 28/41] dma/debug: Simplify stracktrace retrieval

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Message-ID: <20190411030201.uko3njal44w2ea4b@treble>
Date:   Wed, 10 Apr 2019 22:02:01 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Alexander Potapenko <glider@...gle.com>,
        iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RFC patch 28/41] dma/debug: Simplify stracktrace retrieval

On Wed, Apr 10, 2019 at 12:28:22PM +0200, Thomas Gleixner wrote:
> Replace the indirection through struct stack_trace with an invocation of
> the storage array based interface.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: iommu@...ts.linux-foundation.org
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  kernel/dma/debug.c |   13 +++++--------
>  1 file changed, 5 insertions(+), 8 deletions(-)
> 
> --- a/kernel/dma/debug.c
> +++ b/kernel/dma/debug.c
> @@ -89,8 +89,8 @@ struct dma_debug_entry {
>  	int		 sg_mapped_ents;
>  	enum map_err_types  map_err_type;
>  #ifdef CONFIG_STACKTRACE
> -	struct		 stack_trace stacktrace;
> -	unsigned long	 st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
> +	unsigned int	st_len;
> +	unsigned long	st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];

nit: st_entries isn't very readable.  Thanks to the magic of compilers,
the characters are free, so why not call them "stacktrace_entries" and
"stacktrace_len".

-- 
Josh