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The debug control MSR is "highly magical" as the blockstep bit can be cleared by hardware under not well documented circumstances. So a task switch relying on the bit set by the previous task (according to the previous tasks thread flags) can trip over this and not update the flag for the next task. To fix this its required to handle DEBUGCTLMSR_BTF when either the previous or the next or both tasks have the TIF_BLOCKSTEP flag set. While at it avoid branching within the TIF_BLOCKSTEP case and evaluating boot_cpu_data twice in kernels without CONFIG_X86_DEBUGCTLMSR. x86_64: arch/x86/kernel/process.o text data bss dec hex 3024 8577 16 11617 2d61 Before 3008 8577 16 11601 2d51 After i386: No change [ tglx: Made the shift value explicit, use a local variable to make the code readable and massaged changelog] Originally-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Kyle Huey <khuey@kylehuey.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Link: http://lkml.kernel.org/r/20170214081104.9244-3-khuey@kylehuey.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
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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.