From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=193.142.43.55 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794421189; b=SDqPHnCfdr5UdDSiC9c65hvPj0rd3Jij0q9HKk6qjsguQqFu6hnDZ436lrqehFiDoFsi tqez6FKQcxD4JB6IxDoJQjtULuH3zb3HMcAOtXFQGLvoZK5qy9w39XbRTwC+uHtsYOVR2 TQLzbSE+dy8EyJ73a0VyGcst4t7cOJCLe3fC0iErVDzIj0O4vEIzSW1JfA6Gw/VATXiGL /Gdb+NgnJDHIppdX17xt5JJPLY6M48aQlLj7H3cXUUZkG/nsIwl9Zl/qxLZMe0wQW8FAW rk5NaBkL7FyPvkUNPmMoLp2+wKYsQoBKtEvVNLHwUYS2Wl9IXNnBevxGCyg3vSf9Yfw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794421189; h=DMARC-Filter:From:DKIM-Signature:DKIM-Signature:To:Cc:Subject:Date: Message-ID:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=QGPGgmuQu2fufOLJfGHUvsRMzAjWcvAMNtZA8gm+nvI=; b=IKjbADh0bkm5ePKpYzPxF+IGxnHnd8bknf9YFHBM/pTlUvk4qWmlxSJLDcrbNLrome+7 sL9JB4DI/0+Z/Oww0NBidPrgzui0jVQEHOaYFZn3MMrIwuWJlhLD7mFAibQDa5sqruhyl /lfYXm2r44WrfzV7S+MgKLn7/iDuaag9fMkUMpI96hkVYtRAGGIgkO6AnlX1E5T5fk3eW earrY85rw35OYgJ7iC/qZ2NwJpVd/XWFXuY1qISqHCy+BkcDquZZrUeU7qrjCKIQ0oIF6 1aYFl0/3HQo0kbXAcivaYLk24tEds2bapJtQ1Ha4KNDJeOvoq7ql0kKozCJS9aaPMyw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=QBt0qep0; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=iIhaDXlt; arc=none smtp.remote-ip=193.142.43.55 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF3D6606B7A2 for ; Wed, 11 Nov 2026 18:19:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org CF3D6606B7A2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.a=rsa-sha256 header.s=2020 header.b=QBt0qep0; dkim=pass header.d=linutronix.de header.i=@linutronix.de header.a=ed25519-sha256 header.s=2020e header.b=iIhaDXlt From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1794421187; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QGPGgmuQu2fufOLJfGHUvsRMzAjWcvAMNtZA8gm+nvI=; b=QBt0qep0KaZaK1m8yU1ZmzaDfPE9YDMX2zsTTb9XauAlI04CnnhJgcabnb2L8h2as+50hE pXwJEPklkUXrdDEK8apt/q2n9LSv20XMK1YCmtrJGngtDJ2Yg8SEeLBKmE1zrnQc6PcNqo Da3eaonLeIBUVxUX44T/rBM1yYWlr0Rm+ECzA+IDJ6zmJ9bVDqhM030x/2qM643yXG8pyG LiogVCai/jSmBzBVmYtsXxfVlWNjjYVf7jSSPVC3xEYLF6OdAOgec0Qwf4qleajZeuGi4H jTd9pwUbQwbu6G7ZOgxYS3sscnBaAzWdSIUcnv8SZs6oROovzpDpdtGJ0pi76Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1794421187; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QGPGgmuQu2fufOLJfGHUvsRMzAjWcvAMNtZA8gm+nvI=; b=iIhaDXltg9sgD4xI3Yb8DaG0/kXGpDC6XhejljfNSBdorzysTOaVh9z8cAdb8VHfy1tvTX wsrlDcWHjztRfeAA== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Ryan Roberts , Breno Leitao , printk@lists.linux.dev, linux-kernel@vger.kernel.org, Andrew Morton , Baoquan He , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , Dave Young , kexec@lists.infradead.org Subject: [PATCH printk v2 5/6] printk: Add panic+kexec flush point Date: Wed, 11 Nov 2026 19:25:21 +0106 Message-ID: <20261111181942.593695-6-john.ogness@linutronix.de> In-Reply-To: <20261111181942.593695-1-john.ogness@linutronix.de> References: <20261111181942.593695-1-john.ogness@linutronix.de> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit During panic, nbcon consoles transition to atomic printing. However, there are consoles that do not support safe atomic printing (CON_NBCON_ATOMIC_UNSAFE). Such consoles will only flush during panic if their unsafe flush policy allows them to do so. The unsafe flush policy NBCON_PANIC_FLUSH only allows unsafe flushing when particular flushes are explicitly invoked. Call printk_trigger_flush(PR_FLUSH_RESTART) before performing the kexec in order to give such consoles a chance to perform an unsafe flush. Signed-off-by: John Ogness --- kernel/crash_core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/crash_core.c b/kernel/crash_core.c index d0bd2d0cf8990..064b0af903c38 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -140,6 +140,7 @@ void __noclone __crash_kexec(struct pt_regs *regs) crash_setup_regs(&fixed_regs, regs); crash_save_vmcoreinfo(); + printk_trigger_flush(PR_FLUSH_RESTART); machine_crash_shutdown(&fixed_regs); crash_cma_clear_pending_dma(); machine_kexec(kexec_crash_image); -- 2.47.3