linux-kernel - Re: [PATCH V11 1/4] MIPS&LoongArch&NIOS2: Adjust prototypes of p?d

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Date:   Tue, 18 Oct 2022 15:28:58 +0200
From:   Philippe Mathieu-Daudé <philmd@...aro.org>
To:     Huacai Chen <chenhuacai@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>,
        Huacai Chen <chenhuacai@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Dinh Nguyen <dinguyen@...nel.org>
Cc:     loongarch@...ts.linux.dev, linux-arch@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Feiyang Chen <chenfeiyang@...ngson.cn>
Subject: Re: [PATCH V11 1/4] MIPS&LoongArch&NIOS2: Adjust prototypes of
 p?d_init()

On 17/10/22 04:40, Huacai Chen wrote:
> From: Feiyang Chen <chenfeiyang@...ngson.cn>
> 
> We are preparing to add sparse vmemmap support to LoongArch. MIPS and
> LoongArch need to call pgd_init()/pud_init()/pmd_init() when populating
> page tables, so adjust their prototypes to make generic helpers can call
> them.
> 
> NIOS2 declares pmd_init() but doesn't use, just remove it to avoid build
> errors.
> 
> Reviewed-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>   arch/loongarch/include/asm/pgalloc.h | 13 ++-----------
>   arch/loongarch/include/asm/pgtable.h |  8 ++++----
>   arch/loongarch/kernel/numa.c         |  4 ++--
>   arch/loongarch/mm/pgtable.c          | 23 +++++++++++++----------
>   arch/mips/include/asm/pgalloc.h      | 10 +++++-----
>   arch/mips/include/asm/pgtable-64.h   |  8 ++++----
>   arch/mips/kvm/mmu.c                  |  3 +--
>   arch/mips/mm/pgtable-32.c            | 10 +++++-----
>   arch/mips/mm/pgtable-64.c            | 18 ++++++++++--------
>   arch/mips/mm/pgtable.c               |  2 +-
>   arch/nios2/include/asm/pgalloc.h     |  5 -----
>   11 files changed, 47 insertions(+), 57 deletions(-)

> diff --git a/arch/mips/mm/pgtable-32.c b/arch/mips/mm/pgtable-32.c
> index 61891af25019..88819a21d97e 100644
> --- a/arch/mips/mm/pgtable-32.c
> +++ b/arch/mips/mm/pgtable-32.c
> @@ -13,9 +13,9 @@
>   #include <asm/pgalloc.h>
>   #include <asm/tlbflush.h>
>   
> -void pgd_init(unsigned long page)
> +void pgd_init(void *addr)
>   {
> -	unsigned long *p = (unsigned long *) page;
> +	unsigned long *p = (unsigned long *)addr;
>   	int i;
>   
>   	for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
> @@ -61,9 +61,9 @@ void __init pagetable_init(void)
>   #endif
>   
>   	/* Initialize the entire pgd.  */
> -	pgd_init((unsigned long)swapper_pg_dir);
> -	pgd_init((unsigned long)swapper_pg_dir
> -		 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
> +	pgd_init(swapper_pg_dir);
> +	pgd_init((void *)((unsigned long)swapper_pg_dir
> +		 + sizeof(pgd_t) * USER_PTRS_PER_PGD));

Pre-existing, but why not use:

         pgd_init(&swapper_pg_dir[USER_PTRS_PER_PGD]);

?

Otherwise:
Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>