linux-kernel - Re: [PATCH v5] x86: Remove unnecessary kmap() from sgx_ioc_enclave

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Message-ID: <20210324182422.GU3014244@iweiny-DESK2.sc.intel.com>
Date:   Wed, 24 Mar 2021 11:24:22 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Jethro Beekman <jethro@...tanix.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] x86: Remove unnecessary kmap() from
 sgx_ioc_enclave_init()

On Wed, Mar 24, 2021 at 10:47:20AM +0100, Borislav Petkov wrote:
> On Fri, Mar 05, 2021 at 04:20:58PM -0800, ira.weiny@...el.com wrote:
> 
> > Subject: Re: [PATCH v5] x86: Remove unnecessary kmap() from  sgx_ioc_enclave_init()
> 
> The tip tree preferred format for patch subject prefixes is
> 'subsys/component:', e.g. 'x86/apic:', 'x86/mm/fault:', 'sched/fair:',
> 'genirq/core:'. Please do not use file names or complete file paths as
> prefix. 'git log path/to/file' should give you a reasonable hint in most
> cases.

Fixed.

> 
> > From: Ira Weiny <ira.weiny@...el.com>
> > 
> > kmap is inefficient and we are trying to reduce the usage in the kernel.
> 
> Please use passive voice in your commit message: no "we" or "I", etc,
> and describe your changes in imperative mood.
> 
> Also, pls read section "2) Describe your changes" in
> Documentation/process/submitting-patches.rst for more details.
> 
> Bottom line is: personal pronouns are ambiguous in text, especially with
> so many parties/companies/etc developing the kernel so let's avoid them
> please.

Fixed.

> 
> > @@ -615,11 +614,14 @@ static long sgx_ioc_enclave_init(struct sgx_encl *encl, void __user *arg)
> >  	if (copy_from_user(&init_arg, arg, sizeof(init_arg)))
> >  		return -EFAULT;
> >  
> > -	initp_page = alloc_page(GFP_KERNEL);
> > -	if (!initp_page)
> > +	/*
> > +	 * sigstruct must be on a page boundry and token on a 512 byte boundry
> > +	 * kmalloc() gives us this alignment when allocating PAGE_SIZE bytes
> 
> Please integrate scripts/checkpatch.pl into your patch creation
> workflow. Some of the warnings/errors *actually* make sense.
> 
> WARNING: 'boundry' may be misspelled - perhaps 'boundary'?
> #90: FILE: arch/x86/kernel/cpu/sgx/ioctl.c:618:
> +        * sigstruct must be on a page boundry and token on a 512 byte boundry
>                                        ^^^^^^^
> 
> WARNING: 'boundry' may be misspelled - perhaps 'boundary'?
> #90: FILE: arch/x86/kernel/cpu/sgx/ioctl.c:618:
> +        * sigstruct must be on a page boundry and token on a 512 byte boundry
>                                                                        ^^^^^^^
> 
> Also, do you see how other comments in this file are proper sentences?
> Please formulate yours this way too.

Thanks fixed.

> 
> The change itself looks ok.

Thanks, new version 5 sent.

Ira

> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette