linux-kernel - Re: [PATCH v9 01/21] ACPI / table: Use pr_debug() instead of pr

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Message-Id: <20150306201718.9363CC40AA9@trevor.secretlab.ca>
Date:	Fri, 06 Mar 2015 20:17:18 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Olof Johansson <olof@...om.net>
Cc:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Brown <broonie@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	suravee.suthikulpanit@....com, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org, Hanjun Guo <hanjun.guo@...aro.org>
Subject: Re: [PATCH v9 01/21] ACPI / table: Use pr_debug() instead of
 pr_info() for MADT table scanning

On Wed, 25 Feb 2015 16:39:41 +0800
, Hanjun Guo <hanjun.guo@...aro.org>
 wrote:
> For a normal 8 cpu sockets system, it will up to 240 cpu threads (Xeon E7
> v2 family for now), and we need 240 entries for local apic or local x2apic
> in MADT table, so it will be much verbose information printed with a slow
> uart console when system booted, this will be even worse with large system
> with 16/32 cpu sockets.
> 
> This patch just use pr_debug() instead of pr_info() for ioapic/iosapic,
> local apic/x2apic/sapic structures when scanning the MADT table to remove
> those verbose information, but leave other structures unchanged.
> 
> CC: Rafael J Wysocki <rjw@...ysocki.net>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>

One nitpick below, but don't respin over this, and don't do a fixup.

Acked-by: Grant Likely <grant.likely@...aro.org>

> ---
>  drivers/acpi/tables.c | 30 ++++++++++++++++--------------
>  1 file changed, 16 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
> index 93b8152..f4e5b88 100644
> --- a/drivers/acpi/tables.c
> +++ b/drivers/acpi/tables.c
> @@ -23,6 +23,8 @@
>   *
>   */
>  
> +/* Uncomment next line to get verbose printout */
> +/* #define DEBUG */
>  #define pr_fmt(fmt) "ACPI: " fmt
>  
>  #include <linux/init.h>
> @@ -61,9 +63,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
>  		{
>  			struct acpi_madt_local_apic *p =
>  			    (struct acpi_madt_local_apic *)header;
> -			pr_info("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
> -				p->processor_id, p->id,
> -				(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
> +			pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
> +				 p->processor_id, p->id,
> +				 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");

The whitespace changes makes each 1 line change into 3 line changes. In
these situations, I would chose to leave the whitespace alone to keep
the diffstat as small as possible. It makes it less likely to conflict
with other patches and easier to find context.

>  		}
>  		break;
>  
> @@ -71,9 +73,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
>  		{
>  			struct acpi_madt_local_x2apic *p =
>  			    (struct acpi_madt_local_x2apic *)header;
> -			pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
> -				p->local_apic_id, p->uid,
> -				(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
> +			pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
> +				 p->local_apic_id, p->uid,
> +				 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
>  		}
>  		break;
>  
> @@ -81,8 +83,8 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
>  		{
>  			struct acpi_madt_io_apic *p =
>  			    (struct acpi_madt_io_apic *)header;
> -			pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
> -				p->id, p->address, p->global_irq_base);
> +			pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
> +				 p->id, p->address, p->global_irq_base);
>  		}
>  		break;
>  
> @@ -155,9 +157,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
>  		{
>  			struct acpi_madt_io_sapic *p =
>  			    (struct acpi_madt_io_sapic *)header;
> -			pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
> -				p->id, (void *)(unsigned long)p->address,
> -				p->global_irq_base);
> +			pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
> +				 p->id, (void *)(unsigned long)p->address,
> +				 p->global_irq_base);
>  		}
>  		break;
>  
> @@ -165,9 +167,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
>  		{
>  			struct acpi_madt_local_sapic *p =
>  			    (struct acpi_madt_local_sapic *)header;
> -			pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
> -				p->processor_id, p->id, p->eid,
> -				(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
> +			pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
> +				 p->processor_id, p->id, p->eid,
> +				 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
>  		}
>  		break;
>  
> -- 
> 1.9.1
> 

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