[PATCH v2] powerpc/dexcr: Move HASHCHK trap handler

[Michael Ellerman]

On Fri, 15 Sep 2023 13:46:04 +1000, Benjamin Gray wrote:
> Syzkaller reported a sleep in atomic context bug relating to the HASHCHK
> handler logic
> 
>   BUG: sleeping function called from invalid context at arch/powerpc/kernel/traps.c:1518
>   in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 25040, name: syz-executor
>   preempt_count: 0, expected: 0
>   RCU nest depth: 0, expected: 0
>   no locks held by syz-executor/25040.
>   irq event stamp: 34
>   hardirqs last  enabled at (33): [<c000000000048b38>] prep_irq_for_enabled_exit arch/powerpc/kernel/interrupt.c:56 [inline]
>   hardirqs last  enabled at (33): [<c000000000048b38>] interrupt_exit_user_prepare_main+0x148/0x600 arch/powerpc/kernel/interrupt.c:230
>   hardirqs last disabled at (34): [<c00000000003e6a4>] interrupt_enter_prepare+0x144/0x4f0 arch/powerpc/include/asm/interrupt.h:176
>   softirqs last  enabled at (0): [<c000000000281954>] copy_process+0x16e4/0x4750 kernel/fork.c:2436
>   softirqs last disabled at (0): [<0000000000000000>] 0x0
>   CPU: 15 PID: 25040 Comm: syz-executor Not tainted 6.5.0-rc5-00001-g3ccdff6bb06d #3
>   Hardware name: IBM,9105-22A POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1040.00 (NL1040_021) hv:phyp pSeries
>   Call Trace:
>   [c0000000a8247ce0] [c00000000032b0e4] __might_resched+0x3b4/0x400 kernel/sched/core.c:10189
>   [c0000000a8247d80] [c0000000008c7dc8] __might_fault+0xa8/0x170 mm/memory.c:5853
>   [c0000000a8247dc0] [c00000000004160c] do_program_check+0x32c/0xb20 arch/powerpc/kernel/traps.c:1518
>   [c0000000a8247e50] [c000000000009b2c] program_check_common_virt+0x3bc/0x3c0
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/dexcr: Move HASHCHK trap handler
      https://git.kernel.org/powerpc/c/c3f4309693758b13fbb34b3741c2e2801ad28769

cheers