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LO2P265MB5757.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:26f::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7918.22; Sat, 31 Aug 2024 12:16:08 +0000 Received: from LO2P265MB5183.GBRP265.PROD.OUTLOOK.COM ([fe80::1818:a2bf:38a7:a1e7]) by LO2P265MB5183.GBRP265.PROD.OUTLOOK.COM ([fe80::1818:a2bf:38a7:a1e7%7]) with mapi id 15.20.7918.020; Sat, 31 Aug 2024 12:16:08 +0000 Date: Sat, 31 Aug 2024 13:16:06 +0100 From: Gary Guo To: Danilo Krummrich Cc: ojeda@kernel.org, alex.gaynor@gmail.com, wedsonaf@gmail.com, boqun.feng@gmail.com, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@samsung.com, aliceryhl@google.com, akpm@linux-foundation.org, daniel.almeida@collabora.com, faith.ekstrand@collabora.com, boris.brezillon@collabora.com, lina@asahilina.net, mcanal@igalia.com, zhiw@nvidia.com, cjia@nvidia.com, jhubbard@nvidia.com, airlied@redhat.com, ajanulgu@redhat.com, lyude@redhat.com, linux-kernel@vger.kernel.org, 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BHB009hdu1FSzsjivKp1M4PBE6bMLM6iPNVfriQbJ3eKFe3eWkaTFK0Q4sGiP/1jdpmqP3c1UcSVTKee2ifDncFpS4V7RU2o2efhqEKp07bjEtJHslS7ucijGnTRCI/UyQ4C3oe14gDO76lYVY/QrT8JP9SLdvEdWkiOlC/f5j9rTkkBEZxTYyOaxcHAIr1aNWQMoLp4PwELw1lgvpiJeLUDvhzfs5JzvfmzelqvuaBoxrPIGDfFDGKKhomJ6b/ITCrKbHomiSadsEBXl9yJ2LnCP3eczjjZFSO3S8KMl10ARtu/C6MPGDKQpRe+iXXxbD06Ou89FfRRB940cMO/o+cEmoY6MwiWqGctEpU3PaTqmV8tjezotvB3hGLclr/i/KFR9FlM5HcpG5/LVTpeGJdKP487OPjiRkNwHk+wyepaZRaiKNVAJEHuVF6a2X+tE48ndh1MbgTNaFWkXniy6iG8po0AMYeQ9g6x3il4kvLoUmyE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 16 Aug 2024 02:10:44 +0200 Danilo Krummrich wrote: > Separate `aligned_size` from `krealloc_aligned`. > > Subsequent patches implement `Allocator` derivates, such as `Kmalloc`, > that require `aligned_size` and replace the original `krealloc_aligned`. > > Reviewed-by: Alice Ryhl > Reviewed-by: Benno Lossin > Signed-off-by: Danilo Krummrich Reviewed-by: Gary Guo > --- > rust/kernel/alloc/allocator.rs | 19 ++++++++++++------- > 1 file changed, 12 insertions(+), 7 deletions(-) > > diff --git a/rust/kernel/alloc/allocator.rs b/rust/kernel/alloc/allocator.rs > index e6ea601f38c6..c83b6dff896d 100644 > --- a/rust/kernel/alloc/allocator.rs > +++ b/rust/kernel/alloc/allocator.rs > @@ -8,6 +8,17 @@ > > struct KernelAllocator; > > +/// Returns a proper size to alloc a new object aligned to `new_layout`'s alignment. > +fn aligned_size(new_layout: Layout) -> usize { > + // Customized layouts from `Layout::from_size_align()` can have size < align, so pad first. > + let layout = new_layout.pad_to_align(); > + > + // Note that `layout.size()` (after padding) is guaranteed to be a multiple of `layout.align()` > + // which together with the slab guarantees means the `krealloc` will return a properly aligned > + // object (see comments in `kmalloc()` for more information). > + layout.size() > +} > + > /// Calls `krealloc` with a proper size to alloc a new object aligned to `new_layout`'s alignment. > /// > /// # Safety > @@ -15,13 +26,7 @@ > /// - `ptr` can be either null or a pointer which has been allocated by this allocator. > /// - `new_layout` must have a non-zero size. > pub(crate) unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: Flags) -> *mut u8 { > - // Customized layouts from `Layout::from_size_align()` can have size < align, so pad first. > - let layout = new_layout.pad_to_align(); > - > - // Note that `layout.size()` (after padding) is guaranteed to be a multiple of `layout.align()` > - // which together with the slab guarantees means the `krealloc` will return a properly aligned > - // object (see comments in `kmalloc()` for more information). > - let size = layout.size(); > + let size = aligned_size(new_layout); > > // SAFETY: > // - `ptr` is either null or a pointer returned from a previous `k{re}alloc()` by the