Re: [PATCH] kernel/softirq.c: delete 'while' looping to improve alittle performance and beautify code

From: Thomas Gleixner
Date: Mon Jun 10 2013 - 10:16:50 EST

On Sun, 9 Jun 2013, Chen Gang wrote:
> After finish the internal 'while', need not test TASKLET_STATE_SCHED
> again, so looping back to outside 'while' is only for set_bit().
> When use 'if' and set_bit() instead of 'while', it will save at least
> one running conditional instruction, and also will be clearer for readers
> (although the binary size will be a little bigger).

And by doing that you break the atomicity of test_and_set_bit. There
is a good reason why this is an atomic operation and why the code is
written as is.

> The related patch is "1da177e Linux-2.6.12-rc2"

How is that patch related to the problem?


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