linux-kernel - Re: [PATCH v3] kbuild: rust: split up helpers.c

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Message-ID: <20240817172646.1ffc75bc.gary@garyguo.net>
Date: Sat, 17 Aug 2024 17:26:46 +0100
From: Gary Guo <gary@...yguo.net>
To: Andreas Hindborg <nmi@...aspace.dk>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
 Wedson Almeida Filho <wedsonaf@...il.com>, Masahiro Yamada
 <masahiroy@...nel.org>, Andreas Hindborg <a.hindborg@...sung.com>, Boqun
 Feng <boqun.feng@...il.com>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>, Alice
 Ryhl <aliceryhl@...gle.com>, Nathan Chancellor <nathan@...nel.org>, Nicolas
 Schier <nicolas@...sle.eu>, Sergio González Collado
 <sergio.collado@...il.com>, rust-for-linux@...r.kernel.org,
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] kbuild: rust: split up helpers.c

On Thu, 15 Aug 2024 10:30:26 +0000
Andreas Hindborg <nmi@...aspace.dk> wrote:

> From: Andreas Hindborg <a.hindborg@...sung.com>
> 
> This patch splits up the rust helpers C file. When rebasing patch sets on
> upstream linux, merge conflicts in helpers.c is common and time consuming
> [1]. Thus, split the file so that each kernel component can live in a
> separate file.
> 
> This patch lists helper files explicitly and thus conflicts in the file
> list is still likely. However, they should be more simple to resolve than
> the conflicts usually seen in helpers.c.
> 
> Link: https://rust-for-linux.zulipchat.com/#narrow/stream/288089-General/topic/Splitting.20up.20helpers.2Ec/near/426694012 [1]
> Signed-off-by: Andreas Hindborg <a.hindborg@...sung.com>
> 
> ---
> 
> Changes since v2 [2]:
> - Rebase on 6.11-rc3.
> - Use `cpp` instead of Makefile scripting to concatenate files.
> 
> Link:
> https://lore.kernel.org/rust-for-linux/20240507210818.672517-1-ojeda@kernel.org/ [2]
> ---
>  rust/Makefile               |   6 +-
>  rust/helpers.c              | 239 ------------------------------------
>  rust/helpers/README.md      |  17 +++
>  rust/helpers/blk.c          |  16 +++
>  rust/helpers/bug.c          |   9 ++
>  rust/helpers/build_assert.c |  25 ++++
>  rust/helpers/build_bug.c    |  10 ++
>  rust/helpers/err.c          |  22 ++++
>  rust/helpers/helpers.c      |  18 +++
>  rust/helpers/kunit.c        |  10 ++
>  rust/helpers/mutex.c        |  10 ++
>  rust/helpers/page.c         |  24 ++++
>  rust/helpers/refcount.c     |  22 ++++
>  rust/helpers/signal.c       |  10 ++
>  rust/helpers/slab.c         |  10 ++
>  rust/helpers/spinlock.c     |  27 ++++
>  rust/helpers/task.c         |  22 ++++
>  rust/helpers/uaccess.c      |  17 +++
>  rust/helpers/wait.c         |  10 ++
>  rust/helpers/workqueue.c    |  16 +++
>  20 files changed, 298 insertions(+), 242 deletions(-)
>  delete mode 100644 rust/helpers.c
>  create mode 100644 rust/helpers/README.md
>  create mode 100644 rust/helpers/blk.c
>  create mode 100644 rust/helpers/bug.c
>  create mode 100644 rust/helpers/build_assert.c
>  create mode 100644 rust/helpers/build_bug.c
>  create mode 100644 rust/helpers/err.c
>  create mode 100644 rust/helpers/helpers.c
>  create mode 100644 rust/helpers/kunit.c
>  create mode 100644 rust/helpers/mutex.c
>  create mode 100644 rust/helpers/page.c
>  create mode 100644 rust/helpers/refcount.c
>  create mode 100644 rust/helpers/signal.c
>  create mode 100644 rust/helpers/slab.c
>  create mode 100644 rust/helpers/spinlock.c
>  create mode 100644 rust/helpers/task.c
>  create mode 100644 rust/helpers/uaccess.c
>  create mode 100644 rust/helpers/wait.c
>  create mode 100644 rust/helpers/workqueue.c
> 
> diff --git a/rust/helpers/page.c b/rust/helpers/page.c
> new file mode 100644
> index 000000000000..b3280c80b283
> --- /dev/null
> +++ b/rust/helpers/page.c
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/gfp.h>
> +#include <linux/highmem.h>
> +
> +struct page *rust_helper_alloc_pages(gfp_t gfp_mask, unsigned int order)
> +{
> +	return alloc_pages(gfp_mask, order);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_alloc_pages);
> +
> +void *rust_helper_kmap_local_page(struct page *page)
> +{
> +	return kmap_local_page(page);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_kmap_local_page);
> +
> +void rust_helper_kunmap_local(const void *addr)
> +{
> +	kunmap_local(addr);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_kunmap_local);
> +
> +

nit: there're two trailing newlines at the end of this file.

Best,
Gary

> diff --git a/rust/helpers/refcount.c b/rust/helpers/refcount.c
> new file mode 100644
> index 000000000000..13ab64805f77
> --- /dev/null
> +++ b/rust/helpers/refcount.c
> @@ -0,0 +1,22 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/export.h>
> +#include <linux/refcount.h>
> +
> +refcount_t rust_helper_REFCOUNT_INIT(int n)
> +{
> +	return (refcount_t)REFCOUNT_INIT(n);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_REFCOUNT_INIT);
> +
> +void rust_helper_refcount_inc(refcount_t *r)
> +{
> +	refcount_inc(r);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_refcount_inc);
> +
> +bool rust_helper_refcount_dec_and_test(refcount_t *r)
> +{
> +	return refcount_dec_and_test(r);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_refcount_dec_and_test);