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From: Vladimir Murzin <vladimir.murzin@arm.com>
To: Christoph Hellwig <hch@lst.de>, Palmer Dabbelt <palmer@sifive.com>
Cc: linux-mm@kvack.org, Damien Le Moal <damien.lemoal@wdc.com>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	uclinux-dev@uclinux.org
Subject: Re: [PATCH 02/17] mm: stub out all of swapops.h for !CONFIG_MMU
Date: Tue, 11 Jun 2019 11:15:44 +0100
Message-ID: <516c8def-22db-027c-873d-a943454e33af@arm.com> (raw)
In-Reply-To: <20190610221621.10938-3-hch@lst.de>

On 6/10/19 11:16 PM, Christoph Hellwig wrote:
> The whole header file deals with swap entries and PTEs, none of which
> can exist for nommu builds.

Although I agree with the patch, I'm wondering how you get into it?

Cheers
Vladimir

> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  include/linux/swapops.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/swapops.h b/include/linux/swapops.h
> index 4d961668e5fc..b02922556846 100644
> --- a/include/linux/swapops.h
> +++ b/include/linux/swapops.h
> @@ -6,6 +6,8 @@
>  #include <linux/bug.h>
>  #include <linux/mm_types.h>
>  
> +#ifdef CONFIG_MMU
> +
>  /*
>   * swapcache pages are stored in the swapper_space radix tree.  We want to
>   * get good packing density in that tree, so the index should be dense in
> @@ -50,13 +52,11 @@ static inline pgoff_t swp_offset(swp_entry_t entry)
>  	return entry.val & SWP_OFFSET_MASK;
>  }
>  
> -#ifdef CONFIG_MMU
>  /* check whether a pte points to a swap entry */
>  static inline int is_swap_pte(pte_t pte)
>  {
>  	return !pte_none(pte) && !pte_present(pte);
>  }
> -#endif
>  
>  /*
>   * Convert the arch-dependent pte representation of a swp_entry_t into an
> @@ -375,4 +375,5 @@ static inline int non_swap_entry(swp_entry_t entry)
>  }
>  #endif
>  
> +#endif /* CONFIG_MMU */
>  #endif /* _LINUX_SWAPOPS_H */
> 


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Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10 22:16 RISC-V nommu support Christoph Hellwig
2019-06-10 22:16 ` [PATCH 01/17] mm: provide a print_vma_addr stub for !CONFIG_MMU Christoph Hellwig
2019-06-11 10:11   ` Vladimir Murzin
2019-06-10 22:16 ` [PATCH 02/17] mm: stub out all of swapops.h " Christoph Hellwig
2019-06-11 10:15   ` Vladimir Murzin [this message]
2019-06-11 14:18     ` Christoph Hellwig
2019-06-11 14:36       ` Vladimir Murzin
2019-06-14  9:48         ` Christoph Hellwig
2019-06-10 22:16 ` [PATCH 03/17] mm/nommu: fix the MAP_UNINITIALIZED flag Christoph Hellwig
2019-06-11 10:19   ` Vladimir Murzin
2019-06-10 22:16 ` [PATCH 04/17] irqchip/sifive-plic: set max threshold for ignored handlers Christoph Hellwig
2019-06-10 22:16 ` [PATCH 05/17] riscv: use CSR_SATP instead of the legacy sptbr name in switch_mm Christoph Hellwig
2019-06-10 22:16 ` [PATCH 06/17] riscv: clear the instruction cache and all registers when booting Christoph Hellwig
2019-06-10 22:16 ` [PATCH 07/17] riscv: refactor the IPI code Christoph Hellwig
2019-06-10 22:16 ` [PATCH 08/17] riscv: abstract out CSR names for supervisor vs machine mode Christoph Hellwig
2019-06-10 22:16 ` [PATCH 09/17] riscv: improve the default power off implementation Christoph Hellwig
2019-06-10 22:16 ` [PATCH 10/17] riscv: provide a flat entry loader Christoph Hellwig
2019-06-10 22:16 ` [PATCH 11/17] riscv: read hart ID from mhartid on boot Christoph Hellwig
2019-06-10 22:16 ` [PATCH 12/17] riscv: provide native clint access for M-mode Christoph Hellwig
2019-06-10 22:16 ` [PATCH 13/17] riscv: implement remote sfence.i natively " Christoph Hellwig
2019-06-10 22:16 ` [PATCH 14/17] riscv: poison SBI calls " Christoph Hellwig
2019-06-10 22:16 ` [PATCH 15/17] riscv: don't allow selecting SBI-based drivers " Christoph Hellwig
2019-06-10 22:16 ` [PATCH 16/17] riscv: use the correct interrupt levels " Christoph Hellwig
2019-06-10 22:16 ` [PATCH 17/17] riscv: add nommu support Christoph Hellwig
2019-06-11 10:32   ` Vladimir Murzin
2019-06-11 12:44   ` David Hildenbrand
2019-06-24  5:42 RISC-V nommu support v2 Christoph Hellwig
2019-06-24  5:42 ` [PATCH 02/17] mm: stub out all of swapops.h for !CONFIG_MMU Christoph Hellwig

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