linux-kernel - Re: [PATCH v2 6/6] mm/mm_init.c: remove arch_reserved_kernel

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Message-ID: <ZgJx8wXHkbY4FsuT@kernel.org>
Date: Tue, 26 Mar 2024 08:57:55 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Baoquan He <bhe@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, x86@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v2 6/6] mm/mm_init.c: remove arch_reserved_kernel_pages()

On Mon, Mar 25, 2024 at 10:56:46PM +0800, Baoquan He wrote:
> Since the current calculation of calc_nr_kernel_pages() has taken into
> consideration of kernel reserved memory, no need to have
> arch_reserved_kernel_pages() any more.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
>  arch/powerpc/include/asm/mmu.h |  4 ----
>  arch/powerpc/kernel/fadump.c   |  5 -----
>  include/linux/mm.h             |  3 ---
>  mm/mm_init.c                   | 12 ------------
>  4 files changed, 24 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
> index 3b72c7ed24cf..aa5c0fd5edb1 100644
> --- a/arch/powerpc/include/asm/mmu.h
> +++ b/arch/powerpc/include/asm/mmu.h
> @@ -406,9 +406,5 @@ extern void *abatron_pteptrs[2];
>  #include <asm/nohash/mmu.h>
>  #endif
>  
> -#if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
> -#define __HAVE_ARCH_RESERVED_KERNEL_PAGES
> -#endif
> -
>  #endif /* __KERNEL__ */
>  #endif /* _ASM_POWERPC_MMU_H_ */
> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
> index d14eda1e8589..ae8c7619e597 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -1735,8 +1735,3 @@ static void __init fadump_reserve_crash_area(u64 base)
>  		memblock_reserve(mstart, msize);
>  	}
>  }
> -
> -unsigned long __init arch_reserved_kernel_pages(void)
> -{
> -	return memblock_reserved_size() / PAGE_SIZE;
> -}
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index ad19350e1538..ab1ba0a31429 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -3221,9 +3221,6 @@ static inline void show_mem(void)
>  extern long si_mem_available(void);
>  extern void si_meminfo(struct sysinfo * val);
>  extern void si_meminfo_node(struct sysinfo *val, int nid);
> -#ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
> -extern unsigned long arch_reserved_kernel_pages(void);
> -#endif
>  
>  extern __printf(3, 4)
>  void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...);
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index e269a724f70e..089dc60159e9 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -2373,17 +2373,6 @@ void __init page_alloc_init_late(void)
>  	page_alloc_sysctl_init();
>  }
>  
> -#ifndef __HAVE_ARCH_RESERVED_KERNEL_PAGES
> -/*
> - * Returns the number of pages that arch has reserved but
> - * is not known to alloc_large_system_hash().
> - */
> -static unsigned long __init arch_reserved_kernel_pages(void)
> -{
> -	return 0;
> -}
> -#endif
> -
>  /*
>   * Adaptive scale is meant to reduce sizes of hash tables on large memory
>   * machines. As memory size is increased the scale is also increased but at
> @@ -2426,7 +2415,6 @@ void *__init alloc_large_system_hash(const char *tablename,
>  	if (!numentries) {
>  		/* round applicable memory size up to nearest megabyte */
>  		numentries = nr_kernel_pages;
> -		numentries -= arch_reserved_kernel_pages();
>  
>  		/* It isn't necessary when PAGE_SIZE >= 1MB */
>  		if (PAGE_SIZE < SZ_1M)
> -- 
> 2.41.0
> 

-- 
Sincerely yours,
Mike.