linux-kernel - Re: [PATCH 1/5] powerpc: Remove flush_instruction

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Date:   Thu, 13 Aug 2020 13:14:03 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/5] powerpc: Remove flush_instruction_cache for book3s/32

On Thu, Aug 13, 2020 at 01:13:08PM +0100, Christoph Hellwig wrote:
> On Thu, Aug 13, 2020 at 10:12:00AM +0000, Christophe Leroy wrote:
> > -#ifndef CONFIG_PPC_8xx
> > +#if !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC_BOOK3S_32)
> >  _GLOBAL(flush_instruction_cache)
> >  #if defined(CONFIG_4xx)
> >  	lis	r3, KERNELBASE@h
> > @@ -290,18 +289,11 @@ _GLOBAL(flush_instruction_cache)
> >  	mfspr	r3,SPRN_L1CSR1
> >  	ori	r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR
> >  	mtspr	SPRN_L1CSR1,r3
> > -#elif defined(CONFIG_PPC_BOOK3S_601)
> > -	blr			/* for 601, do nothing */
> > -#else
> > -	/* 603/604 processor - use invalidate-all bit in HID0 */
> > -	mfspr	r3,SPRN_HID0
> > -	ori	r3,r3,HID0_ICFI
> > -	mtspr	SPRN_HID0,r3
> >  #endif /* CONFIG_4xx */
> >  	isync
> >  	blr
> >  EXPORT_SYMBOL(flush_instruction_cache)
> > -#endif /* CONFIG_PPC_8xx */
> > +#endif /* CONFIG_PPC_8xx || CONFIG_PPC_BOOK3S_32 */
> 
> What about untangling this into entirely separate versions instead
> of the ifdef mess?  Also the export does not seem to be needed at all.

Ok, I see that you do that later, sorry.