linux-kernel - Re: [PATCH 19/21] amd64_edac: add debugging/testing code

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Date:	Tue, 28 Apr 2009 11:30:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Borislav Petkov <borislav.petkov@....com>
Cc:	greg@...ah.com, linux-kernel@...r.kernel.org,
	dougthompson@...ssion.com, borislav.petkov@....com
Subject: Re: [PATCH 19/21] amd64_edac: add debugging/testing code

On Tue, 28 Apr 2009 17:06:11 +0200
Borislav Petkov <borislav.petkov@....com> wrote:

> From: Doug Thompson <dougthompson@...ssion.com>
> 
> This is for dumping different registers and testing the address mapping
> logic using the ECC syndromes.
> 
>
> ...
>
> +static ssize_t amd64_nbea_store(struct mem_ctl_info *mci,
> +					const char *data, size_t count)
> +{
> +	struct amd64_pvt *pvt = mci->pvt_info;
> +	unsigned long long value;
> +	int rc;
> +
> +	rc = strict_strtoull(data, 16, &value);
> +	if (rc != -EINVAL) {
> +		debugf0("%s() received NBEA= 0x%llx\n", __func__, value);
> +
> +		/* place the value into the virtual error packet */
> +		pvt->ctl_error_info.nbeal = (u32) value;
> +		value >>= 32;
> +		pvt->ctl_error_info.nbeah = (u32) value;
> +
> +		/* Process the Mapping request */
> +		/* TODO: Add race preventation */
> +		amd64_process_error_info(mci, &pvt->ctl_error_info, 1);
> +
> +		return count;
> +	}
> +	return 0;

I think we want to return `rc' here, not zero?

> +}
> +
> +/*
> + * amd64_nbea_show
> + *
> + *	display back what the last NBEA address was written
> + */
> +static ssize_t amd64_nbea_show(struct mem_ctl_info *mci, char *data)
> +{
> +	struct amd64_pvt *pvt = mci->pvt_info;
> +	u64 value;
> +
> +	value = pvt->ctl_error_info.nbeah;
> +	value <<= 32;
> +	value |= pvt->ctl_error_info.nbeal;
> +
> +	return sprintf(data, "%lx\n", (unsigned long) value);

fyi, you could simply do

	return sprintf(data, "%llx\n", value);

here (and in all the other places).  `u64' will always be implemented
as `unsigned long long' on this architecture.  One day _all_ 64-bit
architectures will use ull for u64 and zillions of these typecasts will
no longer be needed.  You'll be safe preparing for that day in this
driver ;)

> +}
> +
> +/*
> + * amd64_nbsl_store
> + *
> + *	accept and store the NBSL value user desires
> + */
> +static ssize_t amd64_nbsl_store(struct mem_ctl_info *mci,
> +					const char *data, size_t count)
> +{
> +	struct amd64_pvt *pvt = mci->pvt_info;
> +	unsigned long value;
> +	int rc;
> +
> +	rc = strict_strtoul(data, 16, &value);
> +	if (rc != -EINVAL) {
> +		debugf0("%s() received NBSL= 0x%lx\n", __func__, value);
> +
> +		/* place the NBSL value into the virtual error packet */
> +		pvt->ctl_error_info.nbsl = (u32) value;
> +
> +		return count;
> +	}
> +	return 0;

Again, this should report the error.

> +}
> +
>
> ...
>
> +/*
> + * amd64_nbsh_store
> + *
> + *	accept and store the NBSH value user desires
> + */
> +static ssize_t amd64_nbsh_store(struct mem_ctl_info *mci,
> +					const char *data, size_t count)
> +{
> +	struct amd64_pvt *pvt = mci->pvt_info;
> +	unsigned long value;
> +	int rc;
> +
> +	rc = strict_strtoul(data, 16, &value);
> +	if (rc != -EINVAL) {
> +		debugf0("%s() received NBSL= 0x%lx\n", __func__, value);
> +
> +		/* place the NBSL value into the virtual error packet */
> +		pvt->ctl_error_info.nbsh = (u32) value;
> +
> +		return count;
> +	}

Many instances...

> +	return 0;
> +}
> +
>
> ...
>
> +static ssize_t amd64_hole_show(struct mem_ctl_info *mci, char *data)
> +{
> +	u64 hole_base = 0;
> +	u64 hole_offset = 0;
> +	u64 hole_size = 0;
> +
> +	amd64_get_dram_hole_info(mci, &hole_base, &hole_offset, &hole_size);
> +
> +	return sprintf(data, "%lx %lx %lx\n",
> +		(long unsigned int) hole_base,
> +		(long unsigned int) hole_offset,
> +		(long unsigned int) hole_size);

hm, odd.  We'd normally use plain old `unsigned long' here.  But as
mentioned above, we can remove these casts.

> +}
>
> ...
>

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