kprobe does not handle events happening in real mode. The very last part of syscall cannot support a trap. Add a symbol syscall_exit_finish to identify that part and blacklist it from kprobe.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> Acked-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com> --- arch/powerpc/kernel/entry_32.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 215aa3a6d4f7..577d17fe0d94 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -463,6 +463,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX) lwz r7,_NIP(r1) lwz r2,GPR2(r1) lwz r1,GPR1(r1) +syscall_exit_finish: #if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS) mtspr SPRN_NRI, r0 #endif @@ -470,6 +471,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX) mtspr SPRN_SRR1,r8 SYNC RFI +_ASM_NOKPROBE_SYMBOL(syscall_exit_finish) #ifdef CONFIG_44x 2: li r7,0 iccci r0,r0 @@ -604,6 +606,7 @@ ret_from_kernel_syscall: mtspr SPRN_SRR1, r10 SYNC RFI +_ASM_NOKPROBE_SYMBOL(ret_from_kernel_syscall) /* * The fork/clone functions need to copy the full register set into -- 2.25.0