linux-kernel - Re: [PATCH v9 26/43] x86/compressed/acpi: Move EFI config table lookup to helper

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Date:   Thu, 3 Feb 2022 16:13:29 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        brijesh.ksingh@...il.com, tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v9 26/43] x86/compressed/acpi: Move EFI config table
 lookup to helper

On Fri, Jan 28, 2022 at 11:17:47AM -0600, Brijesh Singh wrote:
> +int efi_get_conf_table(struct boot_params *boot_params, unsigned long *cfg_tbl_pa,
> +		       unsigned int *cfg_tbl_len)
> +{
> +	unsigned long sys_tbl_pa = 0;
> +	enum efi_type et;
> +	int ret;
> +
> +	if (!cfg_tbl_pa || !cfg_tbl_len)
> +		return -EINVAL;
> +
> +	sys_tbl_pa = efi_get_system_table(boot_params);
> +	if (!sys_tbl_pa)
> +		return -EINVAL;
> +
> +	/* Handle EFI bitness properly */
> +	et = efi_get_type(boot_params);
> +	if (et == EFI_TYPE_64) {
> +		efi_system_table_64_t *stbl =
> +			(efi_system_table_64_t *)sys_tbl_pa;
> +
> +		*cfg_tbl_pa = stbl->tables;
> +		*cfg_tbl_len = stbl->nr_tables;
> +	} else if (et == EFI_TYPE_32) {
> +		efi_system_table_32_t *stbl =
> +			(efi_system_table_32_t *)sys_tbl_pa;

You don't have to break those assignment lines - the 80 cols rule is not
a hard one. Readability is more important.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette