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With CONFIG_DEBUG_PREEMPT, get_paca() produces the following warning in kvmppc_book3s_init_hv() since it calls debug_smp_processor_id(). There is no real issue with the xics_phys field. If paca->kvm_hstate.xics_phys is non-zero on one cpu, it will be non-zero on them all. Therefore this is not fixing any actual problem, just the warning. [ 138.521188] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/5596 [ 138.521308] caller is .kvmppc_book3s_init_hv+0x184/0x350 [kvm_hv] [ 138.521404] CPU: 5 PID: 5596 Comm: modprobe Not tainted 4.11.0-rc3-00022-gc7e790c #1 [ 138.521509] Call Trace: [ 138.521563] [c0000007d018b810] [c0000000023eef10] .dump_stack+0xe4/0x150 (unreliable) [ 138.521694] [c0000007d018b8a0] [c000000001f6ec04] .check_preemption_disabled+0x134/0x150 [ 138.521829] [c0000007d018b940] [d00000000a010274] .kvmppc_book3s_init_hv+0x184/0x350 [kvm_hv] [ 138.521963] [c0000007d018ba00] [c00000000191d5cc] .do_one_initcall+0x5c/0x1c0 [ 138.522082] [c0000007d018bad0] [c0000000023e9494] .do_init_module+0x84/0x240 [ 138.522201] [c0000007d018bb70] [c000000001aade18] .load_module+0x1f68/0x2a10 [ 138.522319] [c0000007d018bd20] [c000000001aaeb30] .SyS_finit_module+0xc0/0xf0 [ 138.522439] [c0000007d018be30] [c00000000191baec] system_call+0x38/0xfc Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> |
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| README | ||
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.