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The compiler is not automatically caching the i915->regs address inside a register and emitting a load for every mmio access. For simple functions like gen8_gt_irq_handler that are already using the raw accessors, we can open-code them for substantial savings: add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-83 (-83) Function old new delta gen8_gt_irq_handler 290 266 -24 gen8_gt_irq_ack 181 122 -59 Total: Before=954637, After=954554, chg -0.01% v2: Add raw_reg_read/raw_reg_write. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180219100926.16554-1-chris@chris-wilson.co.uk
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.