linux-kernel - Re: [PATCH v2] Increase page and bit waitqueue hash size

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Date:   Wed, 17 Mar 2021 11:12:44 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Nicholas Piggin <npiggin@...il.com>, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, Anton Blanchard <anton@...abs.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2] Increase page and bit waitqueue hash size

On 17/03/2021 08.54, Nicholas Piggin wrote:

> +#if CONFIG_BASE_SMALL
> +static const unsigned int page_wait_table_bits = 4;
>  static wait_queue_head_t page_wait_table[PAGE_WAIT_TABLE_SIZE] __cacheline_aligned;

>  
> +	if (!CONFIG_BASE_SMALL) {
> +		page_wait_table = alloc_large_system_hash("page waitqueue hash",
> +							sizeof(wait_queue_head_t),
> +							0,

So, how does the compiler not scream at you for assigning to an array,
even if it's inside an if (0)?

Rasmus