From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 A1019495035; Thu, 6 Aug 2026 23:44:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059847; cv=none; b=PXM9mTrznKNeBQgTiKbQ0Sye0hjT5VAu3r7v8Xqm6LNWW1Oi9Le6dJ1U+SSax+t9EDoBP0vwAkDS0OhJQla9uvO/98mpc6OlpwsCph+sjlnavr4UHWJv6SJKlt5zpqSN6D9Hc43vzG8eksuYxuaRR6WhcE8RlXBmChMGl2+TlBE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059847; c=relaxed/simple; bh=0/W5nz+fbD+gLGE9lsFU0k9klACURcbIwaDrNrlsqAE=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=R4hsV5xVoLbNaizQaMc8MglRNrB7m4eWYXvsnB+aXfQWZLX7pArz81tNl+kHtdpfF46rUjfFHJ73Jyp6vJ1lE2e51BF2cvM58q2UbDRhHnuSTLD7OC62Z9HhVkDbIKXjbR0tdqsu6plA77j/5lIPqsxbxxDB/DWeJ1GRtz+I69w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=tmj5UBZ9; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="tmj5UBZ9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E410F1F00A3A; Thu, 6 Aug 2026 23:44:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1786059845; bh=rQK9Iog+dZqpHKOtPxHQdcEmGMnI0+UlMPo/vsjFyh8=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=tmj5UBZ9ZroLrfUQQ+u9t9t91GehnUHEZxkHXqLYH3DvnQFVIq0lyvoFsckmg6wk1 9OMlxWJ/8GRpMIMN173PuXl4+vzNOMHiPLXq/7vkC3BXDRgFGuZbYXrhrVUGjL2Qze +eVgh2NMbgsyQsvCyCKxAxddW8J3AMSRHON9jgbg= Date: Thu, 6 Aug 2026 16:44:04 -0700 From: Andrew Morton To: mrungta@google.com Cc: Mayank Rungta via B4 Relay , Wim Van Sebroeck , Guenter Roeck , Tzung-Bi Shih , Douglas Anderson , linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org Subject: Re: [PATCH 1/2] nmi: Export CPU backtrace APIs for loadable modules Message-Id: <20260806164404.aca27fe3593bb5c95828807d@linux-foundation.org> In-Reply-To: <20260730-export-cpu-backtrace-apis-v1-1-bace8e1cb817@google.com> References: <20260730-export-cpu-backtrace-apis-v1-0-bace8e1cb817@google.com> <20260730-export-cpu-backtrace-apis-v1-1-bace8e1cb817@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 30 Jul 2026 15:00:21 -0700 Mayank Rungta via B4 Relay wrote: > From: Mayank Rungta > > Currently, CPU backtrace functions cannot be called from loadable > modules because the underlying helper arch_trigger_cpumask_backtrace() > is not exported. > > Instead of exporting arch_trigger_cpumask_backtrace() individually > across every supported architecture, introduce and export a common > helper, cpumask_backtrace(), in lib/nmi_backtrace.c. Update the four > inline CPU backtrace macros in include/linux/nmi.h to route through this > centralized helper. Reviewed-by: Andrew Morton