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The mask for calculating the padding size doesn't change, so there's no need to recalculate it every loop iteration. Furthermore, Once we've done that, it becomes clear that we don't actually need to calculate a padding size at all - by flipping the arithmetic around, we can just combine the upper limit, size, and mask directly to check against the lower limit. For an arm64 build, this alone knocks 20% off the object code size of the entire alloc_iova() function! Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Zhen Lei <thunder.leizhen@huawei.com> Tested-by: Nate Watterson <nwatters@codeaurora.org> [rm: simplified more of the arithmetic, rewrote commit message] Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.