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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun Mar 1, 2026 at 4:34 PM GMT, Andreas Hindborg wrote: > "Gary Guo" writes: > >> On Tue Feb 24, 2026 at 11:17 AM GMT, Andreas Hindborg wrote: >>> Add a method to consume a `Box` and return a `NonNull`. This >>> is a convenience wrapper around `Self::into_raw` for callers that need >>> a `NonNull` pointer rather than a raw pointer. >>> >>> Signed-off-by: Andreas Hindborg >>> --- >>> rust/kernel/alloc/kbox.rs | 8 ++++++++ >>> 1 file changed, 8 insertions(+) >>> >>> diff --git a/rust/kernel/alloc/kbox.rs b/rust/kernel/alloc/kbox.rs >>> index 622b3529edfcb..e6efdd572aeea 100644 >>> --- a/rust/kernel/alloc/kbox.rs >>> +++ b/rust/kernel/alloc/kbox.rs >>> @@ -213,6 +213,14 @@ pub fn leak<'a>(b: Self) -> &'a mut T { >>> // which points to an initialized instance of `T`. >>> unsafe { &mut *Box::into_raw(b) } >>> } >>> + >>> + /// Consumes the `Box` and returns a `NonNull`. >>> + /// >>> + /// Like [`Self::into_raw`], but returns a `NonNull`. >>> + pub fn into_nonnull(b: Self) -> NonNull { >>> + // SAFETY: `KBox::into_raw` returns a valid pointer. >>> + unsafe { NonNull::new_unchecked(Self::into_raw(b)) } >>> + } >> >> Hi Andreas, >> >> It looks like this patch and many others in the series are missing `#[in= line]` >> for quite a few very simple functions. Could you go through the series a= nd mark >> small functions as such? > > Sure. > > Could you remind me why we need this directive? Would the compiler not > be able to decide? `#[inline]` is a hint to make it more likely for compilers to inline. Witho= ut them, you're relying on compiler heurstics only. There're cases (especially= with abstractions) where the function may look complex as it contains lots of function calls (so compiler heurstics avoid inlining them), but they're all zero-cost abstractions so eventually things get optimized away. For non-generic functions, there is additional issue where only very small functions get automatically inlined, otherwise a single copy is generated a= t the defining crate and compiler run on a dependant crate has no chance to even = peek what's in the function. If you know a function should be inlined, it's better to just mark them as = such, so there're no surprises. Best, Gary > > I know we have an issue when we have call to C function in short > functions, but not in the general case? > > > Best regards, > Andreas Hindborg