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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 02/08/2022 13:18, Xianting Tian wrote: > [PATCH V5 1/6] RISC-V: use __smp_processor_id() instead of smp_processor_id() FWIW this subject is very non specific - its not easy to tell what it's about. How about something something like: RISC-V: kexec: fix use of smp_processor_id() in preemptible context > Use __smp_processor_id() to avoid check the preemption context when > CONFIG_DEBUG_PREEMPT enabled, as we will enter crash kernel and no > return. > > Without the patch, > [ 103.781044] sysrq: Trigger a crash > [ 103.784625] Kernel panic - not syncing: sysrq triggered crash > [ 103.837634] CPU1: off > [ 103.889668] CPU2: off > [ 103.933479] CPU3: off > [ 103.939424] Starting crashdump kernel... > [ 103.943442] BUG: using smp_processor_id() in preemptible [00000000] code: sh/346 > [ 103.950884] caller is debug_smp_processor_id+0x1c/0x26 > [ 103.956051] CPU: 0 PID: 346 Comm: sh Kdump: loaded Not tainted 5.10.113-00002-gce03f03bf4ec-dirty #149 > [ 103.965355] Call Trace: > [ 103.967805] [] walk_stackframe+0x0/0xa2 > [ 103.973206] [] show_stack+0x32/0x3e > [ 103.978258] [] dump_stack_lvl+0x72/0x8e > [ 103.983655] [] dump_stack+0x14/0x1c > [ 103.988705] [] check_preemption_disabled+0x9e/0xaa > [ 103.995057] [] debug_smp_processor_id+0x1c/0x26 > [ 104.001150] [] machine_kexec+0x22/0xd0 > [ 104.006463] [] __crash_kexec+0x6a/0xa4 > [ 104.011774] [] panic+0xfc/0x2b0 > [ 104.016480] [] sysrq_reset_seq_param_set+0x0/0x70 > [ 104.022745] [] __handle_sysrq+0x8c/0x154 > [ 104.028229] [] write_sysrq_trigger+0x5a/0x6a > [ 104.034061] [] proc_reg_write+0x58/0xd4 > [ 104.039459] [] vfs_write+0x7e/0x254 > [ 104.044509] [] ksys_write+0x58/0xbe > [ 104.049558] [] sys_write+0xe/0x16 > [ 104.054434] [] ret_from_syscall+0x0/0x2 > [ 104.067863] Will call new kernel at ecc00000 from hart id 0 > [ 104.074939] FDT image at fc5ee000 > [ 104.079523] Bye... > > With the patch we can got clear output, > [ 67.740553] sysrq: Trigger a crash > [ 67.744166] Kernel panic - not syncing: sysrq triggered crash > [ 67.809123] CPU1: off > [ 67.865210] CPU2: off > [ 67.909075] CPU3: off > [ 67.919123] Starting crashdump kernel... > [ 67.924900] Will call new kernel at ecc00000 from hart id 0 > [ 67.932045] FDT image at fc5ee000 > [ 67.935560] Bye... > > Fixes: 0e105f1d0037 ("riscv: use hart id instead of cpu id on machine_kexec") > Reviewed-by: Guo Ren > Reviewed-by: Heiko Stuebner > Reviewed-by: Atish Patra > Signed-off-by: Xianting Tian > --- > arch/riscv/kernel/machine_kexec.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c > index df8e24559035..86d1b5f9dfb5 100644 > --- a/arch/riscv/kernel/machine_kexec.c > +++ b/arch/riscv/kernel/machine_kexec.c > @@ -171,7 +171,7 @@ machine_kexec(struct kimage *image) > struct kimage_arch *internal = &image->arch; > unsigned long jump_addr = (unsigned long) image->start; > unsigned long first_ind_entry = (unsigned long) &image->head; > - unsigned long this_cpu_id = smp_processor_id(); > + unsigned long this_cpu_id = __smp_processor_id(); > unsigned long this_hart_id = cpuid_to_hartid_map(this_cpu_id); > unsigned long fdt_addr = internal->fdt_addr; > void *control_code_buffer = page_address(image->control_code_page); _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec