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Date: Mon, 09 Dec 2013 10:56:46 -0800 From: Joe Perches <joe@...ches.com> To: Frederic Weisbecker <fweisbec@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/3] softirq: Use ffs in __do_softirq On Mon, 2013-12-09 at 19:44 +0100, Frederic Weisbecker wrote: > On Sun, Nov 17, 2013 at 01:55:10AM -0800, Joe Perches wrote: > > Possible speed improvement of the __do_softirq function by using ffs > > instead of using a while loop with an & 1 test then single bit shift. [] > Perhaps using for_each_set_bit() would simplify that more? It might simplify the appearance of the code but it would/could expand the amount of generated code because for_each_set_bit uses an address_of(unsigned long) and the value tested is an unsigned int. extra dereferences, can't be in a register, etc... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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