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([2600:100c:b2a7:c99a:12d7:b0e2:f546:4c3b]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-2db5d0e53dfsm858669fac.45.2025.05.07.13.21.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 May 2025 13:21:28 -0700 (PDT) Message-ID: <7e6ffff3-30ec-49ff-b6a8-f36b61119ae0@gmail.com> Date: Wed, 7 May 2025 14:56:42 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] x86/panic: Add x86_panic_handler as default post-panic behavior To: John Ogness , carlos.bilbao@kernel.org, tglx@linutronix.de, seanjc@google.com, jan.glauber@gmail.com Cc: bilbao@vt.edu, pmladek@suse.com, akpm@linux-foundation.org, jani.nikula@intel.com, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, takakura@valinux.co.jp References: <20250428215952.1332985-1-carlos.bilbao@kernel.org> <20250428215952.1332985-3-carlos.bilbao@kernel.org> <84ldri7vv0.fsf@jogness.linutronix.de> <781ef1d7-f9c6-4a15-b94d-c735e83e7d01@gmail.com> <84bjseozci.fsf@jogness.linutronix.de> Content-Language: en-US From: Carlos Bilbao In-Reply-To: <84bjseozci.fsf@jogness.linutronix.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hello, On 4/30/25 02:58, John Ogness wrote: > On 2025-04-29, Carlos Bilbao wrote: >>> I see no reason why you don't just use safe_halt() as your panic >>> handler. >> Yes, in my original implementation I simply used halt, but I was >> trying to be cautious in case any remaining messages hadn't flushed. I >> wonder, can we be certain that, as you said, all output (e.g., a >> backtrace) has already been displayed on screen at this point? I'm not >> sure. > Well, without this series, the kernel goes into an infinite loop. So if > the messages are not all out, they won't magically appear during the > infinite loop either. I thought there may be some async stuff going on :) > > John Thanks, Carlos