Messages in this thread | | | Date | Fri, 30 Nov 2012 04:05:56 +0000 | From | Al Viro <> | Subject | Re: [RESEND PATCH] fs/super.c set_anon_super calling optimization |
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On Fri, Oct 26, 2012 at 11:14:41AM -0200, Carlos Maiolino wrote: > Hi, > > On Thu, Oct 25, 2012 at 05:08:19PM +0530, Abhijit Pawar wrote: > > Hi, > > set_anon_super is called by many filesystems. Some call directly and > > some call through the wrapper. Many of them in the wrapper's call to > > this function are passing the second argument to this function which > > is not used anywhere. > > > > This patch replaces the second variable with NULL. > > > > If the variable isn't used anymore, why don't just get rid of it, instead of > call the function passing a NULL pointer on it?
Because we want it to be a valid sget() callback. I doubt that this optimization is worth doing, though - might even micro-pessimize the things on architectures where all arguments are passed in registers.
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