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Allocate both struct ppl_io_unit and its header_page from a shared mempool to avoid a possible deadlock. Implement allocate and free functions for the mempool, remove the second pool for allocating header_page. The header_pages are now freed with their io_units, not when the ppl bio completes. Also, use GFP_NOWAIT instead of GFP_ATOMIC for allocating ppl_io_unit because we can handle failed allocations and there is no reason to utilize emergency reserves. Suggested-by: NeilBrown <neilb@suse.com> Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com> Signed-off-by: Shaohua Li <shli@fb.com>
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.