Messages in this thread | | | Date | Thu, 21 May 2015 09:50:38 +0200 | From | Denys Vlasenko <> | Subject | Re: [PATCH] mtd: cfi: Deiline large functions |
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On 05/20/2015 08:56 PM, Brian Norris wrote: > On Mon, May 18, 2015 at 12:58:40PM +0200, Denys Vlasenko wrote: >> With this .config: http://busybox.net/~vda/kernel_config, >> after uninlining these functions have sizes and callsite counts >> as follows: > > Most of this is probably good, thanks. But I'm curious about one: > >> cfi_udelay(): 74 bytes, 26 callsites > > ^^ This is pretty dead-simple. If it's generating bad code, we might > look at fixing it up instead. Almost all of its call sites are with > constant input, so it *should* just become: > > udelay(1); > cond_resched(); > > in most cases. For the non-constant cases, we might still do an > out-of-line implementation. Or maybe we just say it's all not worth it, > and we just stick with what you have. But I'd like to consider > alternatives to out-lining this one.
You want to consider not-deinlining (IOW: speed-optimizing) a *fixed time delay function*?
Think about what delay functions do...
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