linux-kernel - Re: [PATCH v2 03/18] acpi: Remove "continue" in macro INVALID

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Date:	Thu, 01 Aug 2013 16:06:46 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	rjw@...k.pl, lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	hpa@...or.com, akpm@...ux-foundation.org, tj@...nel.org,
	trenn@...e.de, yinghai@...nel.org, jiang.liu@...wei.com,
	wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com,
	yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 03/18] acpi: Remove "continue" in macro
 INVALID_TABLE().

On Thu, 2013-08-01 at 15:06 +0800, Tang Chen wrote:
> The macro INVALID_TABLE() is defined like this:
> 
>  #define INVALID_TABLE(x, path, name)                                    \
>          { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
> 
> And it is used like this:
> 
> 	for (...) {
> 		...
> 		if (...)
> 			INVALID_TABLE()
> 		...
> 	}
> 
> The "continue" in the macro makes the code hard to understand.
> Change it to the style like other macros:
> 
>  #define INVALID_TABLE(x, path, name)                                    \
>          do { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); } while (0)
> 
> So after this patch, this macro should be used like this:
> 
> 	for (...) {
> 		...
> 		if (...) {
> 			INVALID_TABLE()
> 			continue;
> 		}
> 		...
> 	}
> 
> Add the "continue" wherever the macro is called.
> (For now, it is only called in acpi_initrd_override().)
> 
> The idea is from Yinghai Lu <yinghai@...nel.org>.
> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Acked-by: Tejun Heo <tj@...nel.org>
> Reviewed-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
> ---
>  drivers/acpi/osl.c |   18 +++++++++++++-----
>  1 files changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index e721863..91d9f54 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -565,7 +565,7 @@ static const char * const table_sigs[] = {
>  
>  /* Non-fatal errors: Affected tables/files are ignored */
>  #define INVALID_TABLE(x, path, name)					\

Since you are touching this macro, I'd suggest to rename it something
like ACPI_INVALID_TABLE().  INVALID_TABLE() sounds too generic to me.
Otherwise, it looks good.

Acked-by: Toshi Kani <toshi.kani@...com>

Thanks,
-Toshi


> -	{ pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); continue; }
> +	do { pr_err("ACPI OVERRIDE: " x " [%s%s]\n", path, name); } while (0)
>  
>  #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
>  
> @@ -593,9 +593,11 @@ void __init acpi_initrd_override(void *data, size_t size)
>  		data += offset;
>  		size -= offset;
>  
> -		if (file.size < sizeof(struct acpi_table_header))
> +		if (file.size < sizeof(struct acpi_table_header)) {
>  			INVALID_TABLE("Table smaller than ACPI header",
>  				      cpio_path, file.name);
> +			continue;
> +		}
>  
>  		table = file.data;
>  
> @@ -603,15 +605,21 @@ void __init acpi_initrd_override(void *data, size_t size)
>  			if (!memcmp(table->signature, table_sigs[sig], 4))
>  				break;
>  
> -		if (!table_sigs[sig])
> +		if (!table_sigs[sig]) {
>  			INVALID_TABLE("Unknown signature",
>  				      cpio_path, file.name);
> -		if (file.size != table->length)
> +			continue;
> +		}
> +		if (file.size != table->length) {
>  			INVALID_TABLE("File length does not match table length",
>  				      cpio_path, file.name);
> -		if (acpi_table_checksum(file.data, table->length))
> +			continue;
> +		}
> +		if (acpi_table_checksum(file.data, table->length)) {
>  			INVALID_TABLE("Bad table checksum",
>  				      cpio_path, file.name);
> +			continue;
> +		}
>  
>  		pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
>  			table->signature, cpio_path, file.name, table->length);


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