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When setting nr_cpus=1, we observed a crash in IMC code during boot due to a missing allocation: basically, IMC code is taking the number of threads into account in imc_mem_init() and if we manually set nr_cpus for a value that is not multiple of the number of threads per core, an integer division in that function will discard the decimal portion, leading IMC to not allocate one mem_info struct. This causes a NULL pointer dereference later, on is_core_imc_mem_inited(). This patch just rounds that division up, fixing the bug. Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Acked-by: Anju T Sudhakar <anju@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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.