From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD96C375AA2 for ; Fri, 20 Mar 2026 13:21:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774012912; cv=none; b=ICuNw2p+IPBV3HlHTShIsdEbZiRS6J9pEqWfz7zzbwZCe9P7ry3u7feW687aQxIcfyWS3Yo54mV5QzvJiPoiZvo2Yk9zN12rpvjwcFrBK7O//usaY5C7aGSQ7CpFC8AG5GOSBSRBh5uogx2Xyke1VaT1SaBh9OPIZz29H01VSNM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774012912; c=relaxed/simple; bh=hiq1nmhSliSx5AtgWN2RACYLNceeAUUqiOWYreUtLIU=; h=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=ajskpvf35zUHVCiVG2J5Ewd1dh+QOkU1qBw50G3ff7/bX+9hLgZIxN0dxhz9D+VYu8K2hUBIHpWDu0Ryds+G1jfNwartSWMhyWc1z9PSe7fYaHpfiMOppLgZg6uJJVWroAtA6BzqVTVi2VkXEHjivHvPqUxdU5OGruYRN1amkOs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fpV4stKS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fpV4stKS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDCD9C2BCB0; Fri, 20 Mar 2026 13:21:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774012912; bh=hiq1nmhSliSx5AtgWN2RACYLNceeAUUqiOWYreUtLIU=; h=Date:From:To:Cc:Subject:References:From; b=fpV4stKS/jfZp/DPbQxX79FDfCcJYRCb8hDGkLRhOgEf0MV6db7Hw6mc0BHps3YIb CZ5UkPPTJ1F0GB/rUAWScjzrBaYsY6d1Udl2Ng4tbAUXUULsaPQJwHtTtVWW2XeMtE yJ5jitUP5knrz2NCBRomSUmR5Q9BpwM3lVt3q8aXDhDVgzce8yFhjouT3Kbt0L3nGc MepdH44l8OLStDLxTJglmdvaDmYMGaBpGQagz0PohC5QgEg0MH/UZmBe5fbXSukooR 9f9u9UKumsrNoumoi+U9rDG763Iz/CTrh3GVWiY+ReNuj2KBCunS61lkelUuudABo4 w0sZiUrG2N+hg== Date: Fri, 20 Mar 2026 14:21:49 +0100 Message-ID: <20260320132102.364535811@kernel.org> User-Agent: quilt/0.68 From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Dmitry Ilvokhin , Neil Horman , Radu Rendec Subject: [patch v2 05/14] genirq: Expose nr_irqs in core code References: <20260320131108.344376329@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 ... to avoid function calls in the core code to retrieve the maximum number of interrupts. Signed-off-by: Thomas Gleixner Reviewed-by: Dmitry Ilvokhin --- kernel/irq/internals.h | 1 + kernel/irq/irqdesc.c | 28 ++++++++++++++-------------- kernel/irq/proc.c | 2 +- 3 files changed, 16 insertions(+), 15 deletions(-) --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -21,6 +21,7 @@ extern bool noirqdebug; extern int irq_poll_cpu; +extern unsigned int total_nr_irqs; extern struct irqaction chained_action; --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -140,14 +140,14 @@ static void desc_set_defaults(unsigned i desc_smp_init(desc, node, affinity); } -static unsigned int nr_irqs = NR_IRQS; +unsigned int total_nr_irqs __read_mostly = NR_IRQS; /** * irq_get_nr_irqs() - Number of interrupts supported by the system. */ unsigned int irq_get_nr_irqs(void) { - return nr_irqs; + return total_nr_irqs; } EXPORT_SYMBOL_GPL(irq_get_nr_irqs); @@ -159,7 +159,7 @@ EXPORT_SYMBOL_GPL(irq_get_nr_irqs); */ unsigned int irq_set_nr_irqs(unsigned int nr) { - nr_irqs = nr; + total_nr_irqs = nr; return nr; } @@ -187,9 +187,9 @@ static unsigned int irq_find_at_or_after struct irq_desc *desc; guard(rcu)(); - desc = mt_find(&sparse_irqs, &index, nr_irqs); + desc = mt_find(&sparse_irqs, &index, total_nr_irqs); - return desc ? irq_desc_get_irq(desc) : nr_irqs; + return desc ? irq_desc_get_irq(desc) : total_nr_irqs; } static void irq_insert_desc(unsigned int irq, struct irq_desc *desc) @@ -543,7 +543,7 @@ static bool irq_expand_nr_irqs(unsigned { if (nr > MAX_SPARSE_IRQS) return false; - nr_irqs = nr; + total_nr_irqs = nr; return true; } @@ -557,16 +557,16 @@ int __init early_irq_init(void) /* Let arch update nr_irqs and return the nr of preallocated irqs */ initcnt = arch_probe_nr_irqs(); printk(KERN_INFO "NR_IRQS: %d, nr_irqs: %d, preallocated irqs: %d\n", - NR_IRQS, nr_irqs, initcnt); + NR_IRQS, total_nr_irqs, initcnt); - if (WARN_ON(nr_irqs > MAX_SPARSE_IRQS)) - nr_irqs = MAX_SPARSE_IRQS; + if (WARN_ON(total_nr_irqs > MAX_SPARSE_IRQS)) + total_nr_irqs = MAX_SPARSE_IRQS; if (WARN_ON(initcnt > MAX_SPARSE_IRQS)) initcnt = MAX_SPARSE_IRQS; - if (initcnt > nr_irqs) - nr_irqs = initcnt; + if (initcnt > total_nr_irqs) + total_nr_irqs = initcnt; for (i = 0; i < initcnt; i++) { desc = alloc_desc(i, node, 0, NULL, NULL); @@ -862,7 +862,7 @@ void irq_free_descs(unsigned int from, u { int i; - if (from >= nr_irqs || (from + cnt) > nr_irqs) + if (from >= total_nr_irqs || (from + cnt) > total_nr_irqs) return; guard(mutex)(&sparse_irq_lock); @@ -911,7 +911,7 @@ int __ref __irq_alloc_descs(int irq, uns if (irq >=0 && start != irq) return -EEXIST; - if (start + cnt > nr_irqs) { + if (start + cnt > total_nr_irqs) { if (!irq_expand_nr_irqs(start + cnt)) return -ENOMEM; } @@ -923,7 +923,7 @@ EXPORT_SYMBOL_GPL(__irq_alloc_descs); * irq_get_next_irq - get next allocated irq number * @offset: where to start the search * - * Returns next irq number after offset or nr_irqs if none is found. + * Returns next irq number after offset or total_nr_irqs if none is found. */ unsigned int irq_get_next_irq(unsigned int offset) { --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -447,7 +447,7 @@ int __weak arch_show_interrupts(struct s } #ifndef ACTUAL_NR_IRQS -# define ACTUAL_NR_IRQS irq_get_nr_irqs() +# define ACTUAL_NR_IRQS total_nr_irqs #endif #define ZSTR1 " 0"