linux-kernel - Re: [PATCH 06/13] lib min_heap: Add min_heap

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Message-ID: <CAP-5=fURxwVSddrNRhRwT4rWsRhq+BLkAzqi7ooZ6JQbPsOP8A@mail.gmail.com>
Date: Tue, 19 Mar 2024 12:55:10 -0700
From: Ian Rogers <irogers@...gle.com>
To: Kuan-Wei Chiu <visitorckw@...il.com>
Cc: colyli@...e.de, kent.overstreet@...ux.dev, msakai@...hat.com, 
	peterz@...radead.org, mingo@...hat.com, acme@...nel.org, namhyung@...nel.org, 
	akpm@...ux-foundation.org, bfoster@...hat.com, mark.rutland@....com, 
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org, adrian.hunter@...el.com, 
	jserv@...s.ncku.edu.tw, linux-bcache@...r.kernel.org, 
	dm-devel@...ts.linux.dev, linux-bcachefs@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/13] lib min_heap: Add min_heap_peek()

On Tue, Mar 19, 2024 at 11:00 AM Kuan-Wei Chiu <visitorckw@...il.com> wrote:
>
> Add min_heap_peek() function to retrieve a pointer to the smallest
> element. The pointer is cast to the appropriate type of heap elements.
>
> Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>

I see there's coverage of these functions caused by later changes.

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  include/linux/min_heap.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/include/linux/min_heap.h b/include/linux/min_heap.h
> index ed462f194b88..7c1fd1ddc71a 100644
> --- a/include/linux/min_heap.h
> +++ b/include/linux/min_heap.h
> @@ -56,6 +56,16 @@ void __min_heap_init(struct __min_heap *heap, void *data, int size)
>  #define min_heap_init(_heap, _data, _size)     \
>         __min_heap_init(&(_heap)->heap, _data, _size)
>
> +/* Get the minimum element from the heap. */
> +static __always_inline
> +void *__min_heap_peek(struct __min_heap *heap)
> +{
> +       return heap->nr ? heap->data : NULL;
> +}
> +
> +#define min_heap_peek(_heap)   \
> +       (__minheap_cast(_heap) __min_heap_peek(&(_heap)->heap))
> +
>  /* Sift the element at pos down the heap. */
>  static __always_inline
>  void __min_heapify(struct __min_heap *heap, int pos, size_t elem_size,
> --
> 2.34.1
>