linux-kernel - Re: [PATCH] asm-generic: Raise default NR

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <4CF406ED.6070705@pavlinux.ru>
Date:	Mon, 29 Nov 2010 23:02:53 +0300
From:	Pavel Vasilyev <pavel@...linux.ru>
To:	LKML <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH] asm-generic: Raise default NR_IRQS when using sparse
 IRQs

On 29.11.2010 22:20, Mark Brown wrote:
> Rather than have each platform using sparse IRQs pick a suitably large
> NR_IRQS for use with sparse IRQs make the default high when they are
> enabled.  We pick 64k as there is still a bitmap of IRQs that is
> allocated statically, and as we all know 64k should be enough for
> anyone.
> 
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> ---
>  include/asm-generic/irq.h |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/include/asm-generic/irq.h b/include/asm-generic/irq.h
> index b90ec0b..0d95650 100644
> --- a/include/asm-generic/irq.h
> +++ b/include/asm-generic/irq.h
> @@ -4,11 +4,15 @@
>  /*
>   * NR_IRQS is the upper bound of how many interrupts can be handled
>   * in the platform. It is used to size the static irq_map array,
> - * so don't make it too big.
> + * so don't make it too big unless we're using sparse IRQs.
>   */
>  #ifndef NR_IRQS
> +#ifdef CONFIG_SPARSE_IRQ
> +#define NR_IRQS 0xffff
> +#else
>  #define NR_IRQS 64
>  #endif
> +#endif
>  
>  static inline int irq_canonicalize(int irq)
>  {

May be

  #define NR_IRQS 15*NR_CPUS

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/