linux-kernel - Re: [PATCH v3 14/16] powerpc/32: implement fast entry for syscalls on BOOKE

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Date:   Tue, 28 May 2019 15:37:23 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Paul Mackerras <paulus@...abs.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH v3 14/16] powerpc/32: implement fast entry for syscalls on BOOKE

Christophe Leroy <christophe.leroy@....fr> writes:
> Le 23/05/2019 à 09:00, Christophe Leroy a écrit :
>
> [...]
>
>>> arch/powerpc/kernel/head_fsl_booke.o: In function `SystemCall':
>>> arch/powerpc/kernel/head_fsl_booke.S:416: undefined reference to 
>>> `kvmppc_handler_BOOKE_INTERRUPT_SYSCALL_SPRN_SRR1'
>>> Makefile:1052: recipe for target 'vmlinux' failed
>>>
>>>> +.macro SYSCALL_ENTRY trapno intno
>>>> +    mfspr    r10, SPRN_SPRG_THREAD
>>>> +#ifdef CONFIG_KVM_BOOKE_HV
>>>> +BEGIN_FTR_SECTION
>>>> +    mtspr    SPRN_SPRG_WSCRATCH0, r10
>>>> +    stw    r11, THREAD_NORMSAVE(0)(r10)
>>>> +    stw    r13, THREAD_NORMSAVE(2)(r10)
>>>> +    mfcr    r13            /* save CR in r13 for now       */
>>>> +    mfspr    r11, SPRN_SRR1
>>>> +    mtocrf    0x80, r11    /* check MSR[GS] without clobbering reg */
>>>> +    bf    3, 1975f
>>>> +    b    kvmppc_handler_BOOKE_INTERRUPT_\intno\()_SPRN_SRR1
>>>
>>> It seems to me that the "_SPRN_SRR1" on the end of this line
>>> isn't meant to be there...  However, it still fails to link with that
>>> removed.
>
> It looks like I missed the macro expansion.
>
> The called function should be kvmppc_handler_8_0x01B
>
> Seems like kisskb doesn't build any config like this.

I thought we did, ie:

http://kisskb.ellerman.id.au/kisskb/buildresult/13817941/

But clearly something is missing to trigger the bug.

cheers