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From: SeongJae Park <sj@kernel•org>
To: Kees Cook <kees@kernel•org>
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	damon@lists•linux.dev
Subject: Re: [PATCH 09/11] treewide: Convert custom kernel_param_ops .get callbacks to seq_buf via cocci
Date: Fri, 22 May 2026 17:45:43 -0700	[thread overview]
Message-ID: <20260523004543.86540-1-sj@kernel.org> (raw)
In-Reply-To: <20260521133326.2465264-9-kees@kernel.org>

+ damon@lists•linux.dev

On Thu, 21 May 2026 06:33:22 -0700 Kees Cook <kees@kernel•org> wrote:

> Using the following Coccinelle script, convert struct kernel_param_ops
> .get callbacks from "char *" to "struct seq_buf *" when the only write
> to the buffer is via a final call of scnprintf(), snprintf(), sprintf(),
> or sysfs_emit().
> 
> Since seq_buf_printf() will return -1 on overflow, and struct
> kernel_param_ops .get callbacks are expected to truncate without error,
> we must ignore the return value from seq_buf_print() and always return 0
> (as the length is calculated in the common dispatcher code).
> 
> @@
> identifier FN, BUF, KP;
> expression FMT;
> expression list ARGS;
> @@
>  int FN(
> -               char *BUF
> +               struct seq_buf *BUF
>                 , const struct kernel_param *KP)
>  {
>         ... when any
> (
> -       return scnprintf(BUF, PAGE_SIZE, FMT, ARGS);
> |
> -       return snprintf(BUF, PAGE_SIZE, FMT, ARGS);
> |
> -       return sprintf(BUF, FMT, ARGS);
> |
> -       return sysfs_emit(BUF, FMT, ARGS);
> )
> +       seq_buf_printf(BUF, FMT, ARGS);
> +       return 0;
>  }
> 
> No struct kernel_param_ops initializations need changing since
> DEFINE_KERNEL_PARAM_OPS already routes the pointer to .get or .get_str
> via _Generic based on the function signature, so converted callbacks
> are automatically moved from the .get_str to the .get callback.
> 
> Signed-off-by: Kees Cook <kees@kernel•org>
[...]
>  mm/damon/lru_sort.c                           | 14 +++---
>  mm/damon/reclaim.c                            | 14 +++---
>  mm/damon/stat.c                               | 10 ++--

For the above DAMON changes,

Reviewed-by: SeongJae Park <sj@kernel•org>


Thanks,
SJ

[...]

  parent reply	other threads:[~2026-05-23  0:45 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-21 13:33 [PATCH 00/11] Convert moduleparams to seq_buf Kees Cook
2026-05-21 13:33 ` [PATCH 01/11] params: bound array element output to the caller's page buffer Kees Cook
2026-05-21 16:46   ` David Laight
2026-06-01 20:23     ` Matthew Wilcox
2026-06-02 11:26   ` Andy Shevchenko
2026-06-02 12:33     ` Jason Gunthorpe
2026-06-02 13:04     ` David Laight
2026-05-21 13:33 ` [PATCH 02/11] panic: Replace panic_print_get() with generic helper Kees Cook
2026-05-21 13:33 ` [PATCH 03/11] moduleparam: Add DEFINE_KERNEL_PARAM_OPS macro family Kees Cook
2026-05-25 13:27   ` Petr Pavlu
2026-05-21 13:33 ` [PATCH 04/11] treewide: Convert struct kernel_param_ops initializers to DEFINE_KERNEL_PARAM_OPS Kees Cook
2026-05-21 13:59   ` Sean Christopherson
2026-05-22 17:01   ` Rafael J. Wysocki
2026-05-23  0:38   ` SeongJae Park
2026-05-25 13:35   ` Petr Pavlu
2026-05-21 13:33 ` [PATCH 05/11] moduleparam: Rename .get field to .get_str Kees Cook
2026-05-21 13:33 ` [PATCH 06/11] moduleparam: Add seq_buf-based .get callback alongside .get_str Kees Cook
2026-05-25 16:19   ` Petr Pavlu
2026-05-21 13:33 ` [PATCH 07/11] moduleparam: Route DEFINE_KERNEL_PARAM_OPS get pointer via _Generic Kees Cook
2026-05-25 16:24   ` Petr Pavlu
2026-05-21 13:33 ` [PATCH 08/11] params: Convert generic kernel_param_ops .get helpers to seq_buf Kees Cook
2026-05-25 17:10   ` Petr Pavlu
2026-05-21 13:33 ` [PATCH 09/11] treewide: Convert custom kernel_param_ops .get callbacks to seq_buf via cocci Kees Cook
2026-05-21 13:45   ` Sean Christopherson
2026-05-22 17:03   ` Rafael J. Wysocki
2026-05-23  0:45   ` SeongJae Park [this message]
2026-05-21 13:33 ` [PATCH 10/11] treewide: Manually convert custom kernel_param_ops .get callbacks Kees Cook
2026-05-21 17:44   ` Jani Nikula
2026-05-22 17:05   ` Rafael J. Wysocki
2026-05-21 13:33 ` [PATCH 11/11] moduleparam: Drop legacy kernel_param_ops .get_str field and dispatch logic Kees Cook
2026-05-26  6:53 ` [PATCH 00/11] Convert moduleparams to seq_buf Petr Pavlu
2026-06-01 19:59   ` Kees Cook

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