linux-kernel - Re: [PATCH v2 1/6] riscv: Split early and final KASAN population functions

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Date:   Mon, 23 Jan 2023 22:15:43 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-efi@...r.kernel.org
Subject: Re: [PATCH v2 1/6] riscv: Split early and final KASAN population
 functions

Hey Alex,

FYI this patch has a couple places with spaces used rather than tabs for
indent.

>  static void __init kasan_populate_p4d(pgd_t *pgd,
> -				      unsigned long vaddr, unsigned long end,
> -				      bool early)
> +				      unsigned long vaddr, unsigned long end)
>  {
>  	phys_addr_t phys_addr;
>  	p4d_t *p4dp, *base_p4d;
>  	unsigned long next;
>  
> -	if (early) {
> -		/*
> -		 * We can't use pgd_page_vaddr here as it would return a linear
> -		 * mapping address but it is not mapped yet, but when populating
> -		 * early_pg_dir, we need the physical address and when populating
> -		 * swapper_pg_dir, we need the kernel virtual address so use
> -		 * pt_ops facility.
> -		 */
> -		base_p4d = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgd)));
> -	} else {
> -		base_p4d = (p4d_t *)pgd_page_vaddr(*pgd);
> -		if (base_p4d == lm_alias(kasan_early_shadow_p4d)) {
> -			base_p4d = memblock_alloc(PTRS_PER_PUD * sizeof(p4d_t), PAGE_SIZE);
> -			memcpy(base_p4d, (void *)kasan_early_shadow_p4d,
> -				sizeof(p4d_t) * PTRS_PER_P4D);
> -		}
> -	}
> +	base_p4d = (p4d_t *)pgd_page_vaddr(*pgd);
> +	if (base_p4d == lm_alias(kasan_early_shadow_p4d)) {
> +		base_p4d = memblock_alloc(PTRS_PER_PUD * sizeof(p4d_t), PAGE_SIZE);
> +        memcpy(base_p4d, (void *)kasan_early_shadow_p4d,
> +                sizeof(p4d_t) * PTRS_PER_P4D);
> +    }

^^  here.

Thanks,
Conor.


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