On Wed, Aug 26, 2015, at 15:13, Joe Perches wrote:
> vdbg_printk when not using CONFIG_THINKPAD_ACPI_DEBUG uses
> no_printk which produces no logging output but always
> evaluates arguments.
>
> Change the macro to surround the no_printk call with
> do { if (0) no_printk(...); } while (0)
> to avoid the unnecessary argument evaluations.
>
> $ size drivers/platform/x86/thinkpad_acpi.o*
> text data bss dec hex filename
> 60918 6184 824 67926 10956
> drivers/platform/x86/thinkpad_acpi.o.new
> 60927 6184 824 67935 1095f
> drivers/platform/x86/thinkpad_acpi.o.old
The code size savings of this change are really small...
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -402,7 +402,7 @@ static const char *str_supported(int is_supported);
> #else
> static inline const char *str_supported(int is_supported) { return ""; }
> #define vdbg_printk(a_dbg_level, format, arg...) \
> - no_printk(format, ##arg)
> + do { if (0) no_printk(format, ##arg); } while (0)
> #endif
And won't this change disable compile-time checking of 'format ## arg'
for issues?
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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