Re: [U-Boot] [RFC][PATCH] Code Clean-up (weak functions)

Remy Bohmer wrote:

Create a default fallback routine that can be used if there is no strong implementation:

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__attribute__((weak)) unsigned long long printk_clock(void) { return sched_clock(); }

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and here is an example of the strong implementation (from the ARM architecture):

unsigned long long printk_clock(void) { return (unsigned long long)(jiffies - INITIAL_JIFFIES) * (1000000000 / HZ); }

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If the strong implementation is available, the weak is simply discarded during linking, if the strong is omitted, the weak is used as fallback. This is a clean, lean and mean example without complex/superfluous aliases or checks for NULL pointers. It should not get any harder than this...

+1. I like this one, and U-Boot/MIPS _machine_restart() is implemented in the same manner.