On Wed, 2018-04-04 at 10:41:16 UTC, "Naveen N. Rao" wrote: > We get the below warning if we try to use kexec on P9: > kexec_core: Starting new kernel > WARNING: CPU: 0 PID: 1223 at arch/powerpc/kernel/process.c:826 > __set_breakpoint+0xb4/0x140 > [snip] > NIP [c00000000001bf44] __set_breakpoint+0xb4/0x140 > LR [c000000000061268] kexec_prepare_cpus_wait+0x58/0x150 > Call Trace: > [c0000000ee70fad0] [c0000000ee70fb20] 0xc0000000ee70fb20 (unreliable) > [c0000000ee70faf0] [c0000000ee70fb20] 0xc0000000ee70fb20 > [c0000000ee70fbb0] [c000000000061884] default_machine_kexec+0x234/0x2c0 > [c0000000ee70fc40] [c0000000000605c4] machine_kexec+0x84/0x90 > [c0000000ee70fc70] [c000000000206548] kernel_kexec+0xd8/0xe0 > [c0000000ee70fce0] [c000000000169e74] SyS_reboot+0x214/0x2c0 > [c0000000ee70fe30] [c00000000000bd60] system_call+0x58/0x6c > > This happens since we are trying to clear hw breakpoint on POWER9, though > we don't have CPU_FTR_DAWR enabled. Guard __set_breakpoint() within > hw_breakpoint_disable() with ppc_breakpoint_available() to address this. > > Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/5d6a03ebc88f82b0b0adcec24eabb9 cheers
