From: Michael Ellerman mpe@ellerman.id.au
[ Upstream commit fd1eaaaaa6864b5fb8f99880fcefb49760b8fe4e ]
When CONFIG_PPC_RFI_SRR_DEBUG=y we check the SRR values before returning from interrupts. This is done in asm using EMIT_BUG_ENTRY, and passing BUGFLAG_WARNING.
However that fails to create an exception table entry for the warning, and so do_program_check() fails the exception table search and proceeds to call _exception(), resulting in an oops like:
Oops: Exception in kernel mode, sig: 5 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries Modules linked in: CPU: 2 PID: 1204 Comm: sigreturn_unali Tainted: P 5.16.0-rc2-00194-g91ca3d4f77c5 #12 NIP: c00000000000c5b0 LR: 0000000000000000 CTR: 0000000000000000 ... NIP [c00000000000c5b0] system_call_common+0x150/0x268 LR [0000000000000000] 0x0 Call Trace: [c00000000db73e10] [c00000000000c558] system_call_common+0xf8/0x268 (unreliable) ... Instruction dump: 7cc803a6 888d0931 2c240000 4082001c 38800000 988d0931 e8810170 e8a10178 7c9a03a6 7cbb03a6 7d7a02a6 e9810170 <7f0b6088> 7d7b02a6 e9810178 7f0b6088
We should instead use EMIT_WARN_ENTRY, which creates an exception table entry for the warning, allowing the warning to be correctly recognised, and the code to resume after printing the warning.
Note however that because this warning is buried deep in the interrupt return path, we are not able to recover from it (due to MSR_RI being clear), so we still end up in die() with an unrecoverable exception.
Fixes: 59dc5bfca0cb ("powerpc/64s: avoid reloading (H)SRR registers if they are still valid") Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20211221135101.2085547-2-mpe@ellerman.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kernel/interrupt_64.S | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S index 894588b2381e5..4b1ff94e67eb4 100644 --- a/arch/powerpc/kernel/interrupt_64.S +++ b/arch/powerpc/kernel/interrupt_64.S @@ -32,21 +32,21 @@ COMPAT_SYS_CALL_TABLE: ld r12,_NIP(r1) clrrdi r12,r12,2 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_SRR1 ld r12,_MSR(r1) 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) .else mfspr r11,SPRN_HSRR0 ld r12,_NIP(r1) clrrdi r12,r12,2 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_HSRR1 ld r12,_MSR(r1) 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) .endif #endif .endm