linux-kernel - Re: [PATCH v10 05/12] mm: HUGE

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Date:   Mon, 25 Jan 2021 09:19:35 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Christoph Hellwig <hch@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Zefan Li <lizefan@...wei.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v10 05/12] mm: HUGE_VMAP arch support cleanup



Le 24/01/2021 à 12:40, Christoph Hellwig a écrit :
>> diff --git a/arch/arm64/include/asm/vmalloc.h b/arch/arm64/include/asm/vmalloc.h
>> index 2ca708ab9b20..597b40405319 100644
>> --- a/arch/arm64/include/asm/vmalloc.h
>> +++ b/arch/arm64/include/asm/vmalloc.h
>> @@ -1,4 +1,12 @@
>>   #ifndef _ASM_ARM64_VMALLOC_H
>>   #define _ASM_ARM64_VMALLOC_H
>>   
>> +#include <asm/page.h>
>> +
>> +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
>> +bool arch_vmap_p4d_supported(pgprot_t prot);
>> +bool arch_vmap_pud_supported(pgprot_t prot);
>> +bool arch_vmap_pmd_supported(pgprot_t prot);
>> +#endif
> 
> Shouldn't the be inlines or macros?  Also it would be useful
> if the architectures would not have to override all functions
> but just those that are it actually implements?
> 
> Also lots of > 80 char lines in the patch.
> 

Since https://github.com/linuxppc/linux/commit/bdc48fa11e46f867ea4d75fa59ee87a7f48be144
this 80 char limit is not strongly enforced anymore.

Allthough 80 is still the prefered limit, code is often more readable with a slightly longer single 
line that with lines splited.

Christophe