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Date:	Tue, 6 Oct 2015 11:25:59 -0700
From:	Laura Abbott <>
To:	Michael Ellerman <>
Cc:	Benjamin Herrenschmidt <>,
	Paul Mackerras <>,
	"" <>,
	Linux Kernel Mailing List <>
Subject: Re: Missing operand for tlbie instruction on Power7

On 10/05/2015 08:35 PM, Michael Ellerman wrote:
> On Fri, 2015-10-02 at 08:43 -0700, Laura Abbott wrote:
>> Hi,
>> We received a report ( of bad assembly
>> when compiling on powerpc with little endian
> ...
>> After some discussion with the binutils folks, it turns out that the tlbie
>> instruction actually requires another operand and binutils was updated to
>> check for this .
>> The code sequence in arch/powerpc/include/asm/ppc_asm.h now needs to be updated:
>> #if !defined(CONFIG_4xx) && !defined(CONFIG_8xx)
>> #define tlbia                                   \
>>           li      r4,1024;                        \
>>           mtctr   r4;                             \
>>           lis     r4,KERNELBASE@h;                \
>> 0:      tlbie   r4;                             \
>>           addi    r4,r4,0x1000;                   \
>>           bdnz    0b
>> #endif
>> I don't know enough ppc assembly to properly fix this but I can test.
> How are you testing? This code is fairly old and I'm dubious if it still works.
> These days we have a ppc_md hook for flushing the TLB, ppc_md.flush_tlb().
> Ideally the swsusp code would use that.
> cheers

Testing would probably just be compile and maybe boot. I don't have regular
access to the hardware. This problem just showed up for me when someone
tried to compile Fedora rawhide with the latest binutils.

 From what I can tell, it looks like the .flush_tlb of the cpu_spec is only
defined for power7 and power8 and I don't see a ppc_md.flush_tlb on the
master branch. It's not clear what to do for the case where there is no
flush_tlb function. Would filling in a .flush_tlb for all the PPC_BOOK3S_64
with the existing tlbia sequence work? It's also worth noting that the
__flush_power7 uses tlbiel instead of tlbie.

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