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This patch improves the code that takes lock twice to check the resend flag and do the actual resending, by checking the resend flag locklessly, and add a boolean parameter check_resend to icp_[rm_]deliver_irq(), so the resend flag can be checked in the lock when doing the delivery. We need make sure when we clear the ics's bit in the icp's resend_map, we don't miss the resend flag of the irqs that set the bit. It could be ordered through the barrier in test_and_clear_bit(), and a newly added wmb between setting irq's resend flag, and icp's resend_map. Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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.