Messages in this thread | | | From | Hans-Jürgen Koch <> | Subject | Re: [PATCH] at91 pm: Compilation fix for at91sam926x | Date | Fri, 10 Aug 2007 09:12:35 +0200 |
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Am Freitag 10 August 2007 00:15 schrieb Ulf Samuelsson: > > > > +#if defined(CONFIG_ARCH_AT91RM9200) > > > at91_sys_write(AT91_SDRAMC_SRR, 1); /* > > > self-refresh mode */ > > > Why don't use: > > if (cpu_is_at91rm9200()) > > at91_sys_write(AT91_SDRAMC_SRR, 1); > > What is the benefit? > Will the optimizer remove the code if the CPU is not the at91rm9200?
No, it won't. cpu_is_something() is intended for runtime decisions. Remember that the purpose of this patch was to solve a compile time issue (see subject). AT91_SDRAMC_SRR isn't defined properly for non-9200 processors because they don't have that register. So we need something like #ifdef to include this line only on 9200.
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