[PATCH] powerpc/mm: Mark get_slice_psize() & slice_addr_is_low() as notrace

[Michael Ellerman]

On Sat, 2019-12-21 at 12:13:37 UTC, Michael Ellerman wrote:
> These slice routines are called from the SLB miss handler, which can
> lead to warnings from the IRQ code, because we have not reconciled the
> IRQ state properly:
> 
>   WARNING: CPU: 72 PID: 30150 at arch/powerpc/kernel/irq.c:258 arch_local_irq_restore.part.0+0xcc/0x100
>   Modules linked in:
>   CPU: 72 PID: 30150 Comm: ftracetest Not tainted 5.5.0-rc2-gcc9x-g7e0165b2f1a9 #1
>   NIP:  c00000000001d83c LR: c00000000029ab90 CTR: c00000000026cf90
>   REGS: c0000007eee3b960 TRAP: 0700   Not tainted  (5.5.0-rc2-gcc9x-g7e0165b2f1a9)
>   MSR:  8000000000021033 <SF,ME,IR,DR,RI,LE>  CR: 22242844  XER: 20000000
>   CFAR: c00000000001d780 IRQMASK: 0
>   ...
>   NIP arch_local_irq_restore.part.0+0xcc/0x100
>   LR  trace_graph_entry+0x270/0x340
>   Call Trace:
>     trace_graph_entry+0x254/0x340 (unreliable)
>     function_graph_enter+0xe4/0x1a0
>     prepare_ftrace_return+0xa0/0x130
>     ftrace_graph_caller+0x44/0x94	# (get_slice_psize())
>     slb_allocate_user+0x7c/0x100
>     do_slb_fault+0xf8/0x300
>     instruction_access_slb_common+0x140/0x180
> 
> Fixes: 48e7b7695745 ("powerpc/64s/hash: Convert SLB miss handlers to C")
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Applied to powerpc fixes.

https://git.kernel.org/powerpc/c/91a063c956084fb21cf2523bce6892514e3f1799

cheers