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 E035B1A38E3; Fri, 4 Apr 2025 09:32:59 +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=1743759180; cv=none; b=rON21FEvjJErQKI4ol6kxExdJ1HOWy4oNEYMBTdW4k7gZMvMoKfNHvTiYEnWuvTHiR6Cp0/O1XQ/pfsLda8LwC9MgrfT719dpnHpjZL8r0Fv24yAAf6qp2/UEoTP3n9d3y6sUXBqlJafo6fhwy1//tRw17IZ4AWPZ6/uAAXGAGo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743759180; c=relaxed/simple; bh=x/htCtnL4bJbQP2vXMg/bxEFFPbS11UpyoiMOMuZhvU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BRl2M9BVxfbT77z3e6AJLdFciRLMtL6rEN0xITRVTuC489BHnc6MEPmUrCPfInwudvcuJxgaTqmyv+JPPX1ApRMrgsbwwnDUetlBlYogxgpdyX3JW+HJsECR9735gC9MrWIicTTMCraJvJQ/3i4ZNbVV5ObF145ohWAWbdi2krk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nq1cnFY2; 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="nq1cnFY2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC6BDC4CEDD; Fri, 4 Apr 2025 09:32:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1743759179; bh=x/htCtnL4bJbQP2vXMg/bxEFFPbS11UpyoiMOMuZhvU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nq1cnFY2+4/Yt4lih9yaYqSrPLqIoT1sqSPa/3a54HfC32ZzPeiCvxzJDZ3o3GQ2c GVq6c5d/AIuGVHJqgXhJHgP3Lw2Zz2irdSPow+o0xa0oR0uEFTflEH/dho8HadSQuR a1jk056yjABFzETI3RLW0Q1OJRaD6QGlDuFb8uhFd5XnVcgt+k/wY7q6y4TEJjRfaJ ZgGKXZtrK6v8/SLdO5Xbo/jKoP69FCEUEfYQz7NOOX4ifwpIgMMhxsCXPx6AOMQjRP MyDVWksd4rHqFXhOeZwSuWioXXbo8utI3YOES21FaFi21yDM/dff5LNL6uAvrHWXX7 R6EDtGdg+micA== Date: Fri, 4 Apr 2025 10:32:54 +0100 From: Simon Horman To: Stanislav Fomichev Cc: netdev@vger.kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, paulmck@kernel.org, joel@joelfernandes.org, steven.price@arm.com, akpm@linux-foundation.org, matttbe@kernel.org, anshuman.khandual@arm.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next] configs/debug: run and debug PREEMPT Message-ID: <20250404093254.GC214849@horms.kernel.org> References: <20250402172305.1775226-1-sdf@fomichev.me> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250402172305.1775226-1-sdf@fomichev.me> On Wed, Apr 02, 2025 at 10:23:05AM -0700, Stanislav Fomichev wrote: > Recent change [0] resulted in a "BUG: using __this_cpu_read() in > preemptible" splat [1]. PREEMPT kernels have additional requirements > on what can and can not run with/without preemption enabled. > Expose those constrains in the debug kernels. > > 0: https://lore.kernel.org/netdev/20250314120048.12569-2-justin.iurman@uliege.be/ > 1: https://lore.kernel.org/netdev/20250402094458.006ba2a7@kernel.org/T/#mbf72641e9d7d274daee9003ef5edf6833201f1bc > > Signed-off-by: Stanislav Fomichev Reviewed-by: Simon Horman