linux-kernel - Re: [PATCH 1/2] powerpc/asm-offset: Remove unused items related to paca

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Date:   Tue, 4 May 2021 12:40:44 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Nicholas Piggin <npiggin@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/2] powerpc/asm-offset: Remove unused items related to
 paca



Le 04/05/2021 à 12:14, Nicholas Piggin a écrit :
> Excerpts from Christophe Leroy's message of May 4, 2021 2:46 am:
>> PACA_SIZE, PACACONTEXTID, PACALOWSLICESPSIZE, PACAHIGHSLICEPSIZE,
>> PACA_SLB_ADDR_LIMIT, MMUPSIZEDEFSIZE, PACASLBCACHE, PACASLBCACHEPTR,
>> PACASTABRR, PACAVMALLOCSLLP, MMUPSIZESLLP, PACACONTEXTSLLP,
>> PACALPPACAPTR, LPPACA_DTLIDX and PACA_DTL_RIDX are not used anymore
>> by ASM code.
> 
> Reviewed-by: Nicholas Piggin <npiggin@...il.com>
> 
> Also I think SIGSEGV, NMI_MASK, THREAD_DBCR0, KUAP?, TI_FLAGS,
> TI_PREEMPT, [ID]CACHEL1*, STACK_REGS_KUAP, EXC_LVL_SIZE, KVM_NEED_FLUSH,
> KVM_FWNMI, VCPU_DEC, VCPU_SPMC, HSTATE_XICS_PHYS, HSTATE_SAVED_XIRR,
> PPC_DBELL_MSGTYPE I think. While we're cleaning it up.

Yes, thanks for checking.

I think we can safely remove KUAP.

But we can't remove EXC_LVL_SIZE, it is used in kernel/head_booke.h which is probably included in 
head_44x.S and head_fsl_booke.S

Christophe