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Message-ID: <cf1b1b35-c608-9b5e-0c1a-216431b83750@nvidia.com>
Date: Sun, 8 Nov 2020 23:45:57 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Barry Song <song.bao.hua@...ilicon.com>,
<akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>
CC: <linuxarm@...wei.com>, Ralph Campbell <rcampbell@...dia.com>,
Randy Dunlap <rdunlap@...radead.org>,
John Garry <john.garry@...wei.com>
Subject: Re: [PATCH v2] mm/gup_test: GUP_TEST depends on DEBUG_FS
On 11/8/20 12:37 AM, Barry Song wrote:
> Without DEBUG_FS, all the code in gup_test becomes meaningless. For sure
> kernel provides debugfs stub while DEBUG_FS is disabled, but the point
> here is that GUP_TEST can do nothing without DEBUG_FS.
>
> Cc: John Hubbard <jhubbard@...dia.com>
> Cc: Ralph Campbell <rcampbell@...dia.com>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Suggested-by: John Garry <john.garry@...wei.com>
> Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>
> ---
> -v2:
> add comment as a prompt to users as commented by John and Randy, thanks!
>
> mm/Kconfig | 4 ++++
> 1 file changed, 4 insertions(+)
Thanks for suffering through a lot of discussion about this!
Reviewed-by: John Hubbard <jhubbard@...dia.com>
thanks,
--
John Hubbard
NVIDIA
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 01b0ae0cd9d3..a7ff0d31afd5 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -836,6 +836,7 @@ config PERCPU_STATS
>
> config GUP_TEST
> bool "Enable infrastructure for get_user_pages()-related unit tests"
> + depends on DEBUG_FS
> help
> Provides /sys/kernel/debug/gup_test, which in turn provides a way
> to make ioctl calls that can launch kernel-based unit tests for
> @@ -853,6 +854,9 @@ config GUP_TEST
>
> See tools/testing/selftests/vm/gup_test.c
>
> +comment "GUP_TEST needs to have DEBUG_FS enabled"
> + depends on !GUP_TEST && !DEBUG_FS
> +
> config GUP_GET_PTE_LOW_HIGH
> bool
>
>
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