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 48C43266581 for ; Wed, 1 Apr 2026 21:52:40 +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=1775080361; cv=none; b=qMGL7OtiBaNaXhFJ7EvgQH0S9Viuqcz5QpT8PNqB0QN0S9ii0l3GNFtSvUX67yY0TaepygaUAOoT7pODF8wTlAxgvv+UpTfqb0qlqcfyrGlmYEU/gi6YX8JJpAM7OKL7uGc64S+gxNCKr1tflElN6t6YiqP7IMFcLRfaLBLH3LU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775080361; c=relaxed/simple; bh=XbbOpJ+sjaeABkzOAuvkLiqZTz43SU+1ibUZNH1IkEU=; h=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=p8g+EPbhabEAhyMh4u2n0C3SwSj9alrBPhnUJ+MMBg98H+O7IE9QFA2U3yVUfEGpPVxkHsah+W7thNthkXTa6tcIFOwGEQ5aGZINhY9EWv3nqdGU7Zq9/wis26aDYlxFPBexJMrnhhNTLj95GMOfhmqH1i/C0Cc/EYhNURXO5xM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eqsDx8Dt; 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="eqsDx8Dt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C830C4CEF7; Wed, 1 Apr 2026 21:52:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775080360; bh=XbbOpJ+sjaeABkzOAuvkLiqZTz43SU+1ibUZNH1IkEU=; h=Date:From:To:Cc:Subject:References:From; b=eqsDx8DtfWSUh/4NVMrSXGSsBxNlWEM4gqOYnw34uN89sTfHaG3octRHdz2K9eIV2 RMPQYrhUkfSvhropQUmMNsTBlMTifky7peG+PZy4Ff+nxoLIYsWaRTEK0Gnd/lnwE0 tZLQ7QexpiYZCOPBVCzzjCGdNvsu05AGwY60LwJO4gyTmjfLi582GHjrqTCUmXRiZ5 4T1lAzJeeJtbLZ/3WQ0EL6WIqkyyrPYkIyAX8Ye5Zc/ZAyiA8eNLUMlaEMz1JT1dlS 9rRGwOe2STiYtCV530N4Zudzzn8Mwx4Da+Bmv+5rR/UR0+hRfCjo8NqVAzldo6e+9C GU1fJQMmM4GFg== Date: Wed, 01 Apr 2026 23:52:37 +0200 Message-ID: <20260401201348.897096035@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 , Marc Zyngier Subject: [patch V5 13/15] genirq: Expose irq_find_desc_at_or_after() in core code References: <20260401195625.213446764@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 From: Thomas Gleixner ... in preparation for a smarter iterator for /proc/interrupts. Signed-off-by: Thomas Gleixner Reviewed-by: Dmitry Ilvokhin --- 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,