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 5E01131AF3B for ; Thu, 26 Mar 2026 21:57:57 +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=1774562277; cv=none; b=fT4z3W6M2xDmiyYKXgel6BnsT4DZ6013A+ZP7foqHa91Ibk59IS5vC+KNPsmQnoVT2tnpt8MPkIYsgEfCBcTDccon4Q8oMtvFs0weYYnsHreeV2hQXfqllaYSM7r1pKePt4piQL4yUBoq/JoeCzy2Rlb3NOghEqUeg6l7YMD4uQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774562277; c=relaxed/simple; bh=H9ejmyIqOMSZMJye3Eb5awarH3UubG6Viizw1lTdVVM=; h=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=raQra4P6CPknhJHX3tcHxgPpOqghPcUPepFvBNEuDwpr7eQVeVa7ojaitqRaxwLMfl0YSh3p+dmkxRdO9Bz4ulhx1SlM5DaN8IEqkupf2gduNMbMoMAGAua3npzbxEbozMJkBpFWLuA+hK7xYC8mjz7DkJuskXFtwc7PflbGS/Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sj6ymkZh; 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="sj6ymkZh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E3D6C116C6; Thu, 26 Mar 2026 21:57:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774562277; bh=H9ejmyIqOMSZMJye3Eb5awarH3UubG6Viizw1lTdVVM=; h=Date:From:To:Cc:Subject:References:From; b=sj6ymkZh2KxJSRU2XYvEyTQdcGPnP33raZEl26bX8+JCCC9PXd/T7R3PiaHPZ8W0a wLN0y66RhnvDzBOJZbOvEQzug8BBunKvP/8aU0Ml536/pfZvXdwa2H9uXTQRbN0TIv EF0iOwGWwuf/eJF+gdKISWCX5s2kjwymA6kBRca+oODPdSAi8+r7ErRkdSPdDnN5yw U666FB28/8wcBRyI+eFEAU63yk1e+bU5P31wv75gOkLvo14p3mscymtQxBl5KYczyB wH26+lcq+QnkqF/cmQNjzLWhjG1agHIfEJ861gAdIft3aJJ43udPBBM2HA3+a6L80f b0hoJIzxLn/NQ== Date: Thu, 26 Mar 2026 22:57:53 +0100 Message-ID: <20260326215037.053152787@kernel.org> User-Agent: quilt/0.68 From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Michael Kelley , Dmitry Ilvokhin , Radu Rendec , Jan Kiszka , Kieran Bingham , Florian Fainelli Subject: [patch V3 12/14] genirq: Expose irq_find_desc_at_or_after() in core code References: <20260326214345.019130211@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 ... in preparation for a smarter iterator for /proc/interrupts. Signed-off-by: Thomas Gleixner --- V3: Add missing RCU guard and a lockdep assert - Dmitry --- kernel/irq/internals.h | 2 ++ kernel/irq/irqdesc.c | 15 ++++++++------- 2 files changed, 10 insertions(+), 7 deletions(-) --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -155,6 +155,8 @@ void irq_proc_calc_prec(void); static inline void irq_proc_calc_prec(void) { } #endif +struct irq_desc *irq_find_desc_at_or_after(unsigned int offset); + extern bool irq_can_set_affinity_usr(unsigned int irq); extern int irq_do_set_affinity(struct irq_data *data, --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -181,15 +181,12 @@ static int irq_find_free_area(unsigned i return mas.index; } -static unsigned int irq_find_at_or_after(unsigned int offset) +struct irq_desc *irq_find_desc_at_or_after(unsigned int offset) { unsigned long index = offset; - struct irq_desc *desc; - - guard(rcu)(); - desc = mt_find(&sparse_irqs, &index, total_nr_irqs); - return desc ? irq_desc_get_irq(desc) : total_nr_irqs; + lockdep_assert_in_rcu_read_lock(); + return mt_find(&sparse_irqs, &index, total_nr_irqs); } static void irq_insert_desc(unsigned int irq, struct irq_desc *desc) @@ -934,7 +931,11 @@ EXPORT_SYMBOL_GPL(__irq_alloc_descs); */ unsigned int irq_get_next_irq(unsigned int offset) { - return irq_find_at_or_after(offset); + struct irq_desc *desc; + + guard(rcu)(); + desc = irq_find_desc_at_or_after(offset); + return desc ? irq_desc_get_irq(desc) : total_nr_irqs; } struct irq_desc *__irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,