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Message-ID: <20120626203400.GA11413@one.firstfloor.org> Date: Tue, 26 Jun 2012 22:34:00 +0200 From: Andi Kleen <andi@...stfloor.org> To: Mel Gorman <mel@....ul.ie> Cc: Andi Kleen <andi@...stfloor.org>, Rafael Aquini <aquini@...hat.com>, linux-mm@...ck.org, Rik van Riel <riel@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org Subject: Re: [PATCH 1/4] mm: introduce compaction and migration for virtio ballooned pages > How is the compiler meant to optimise away "cond" if it's a function > call? Inlines can be optimized away. These tests are usually inlines. > What did I miss? If nothing, then I will revert this particular change > and Rafael will need to be sure his patch is not using VM_BUG_ON to call > a function with side-effects. Do you have an example where the code is actually different, or are you just speculating? FWIW for my config both generates the same code: size vmlinux-andi-vmbug vmlinux-vmbug-nothing text data bss dec hex filename 11809704 1457352 1159168 14426224 dc2070 vmlinux-andi-vmbug 11809704 1457352 1159168 14426224 dc2070 vmlinux-vmbug-nothing -Andi -- 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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