From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 9568832F75B for ; Tue, 2 Sep 2025 18:31:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756837893; cv=none; b=hrVEsB5wnE7McP3wFEmYR8B8wb+qe87Cx/3k4sB7S/6mxfFHzHOqfKy/HgKffWEOXj1+zIjFTHiFPbHsLhsH4xqe3Ofsk4pmXW9hFLJwu2eWvvWZqYrR2U09Jyn47HixDspZpKkg3//QOxZyDBbOXWc+YeNsXPoSCmzHzg7x+dQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756837893; c=relaxed/simple; bh=bZOYVXXZ2ikO0bCHFqNa4jLXDEwneJoyAdCp82lzXwk=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=PcrdXyXYUqeucXnkq5eOiWEkClcXcu08X8VG4F8APgb2Nlt654qImE89lUItFk8l/xmHZhnv5x4/Bl7DolrWqH6EeEuFLIvXNePdKs0iC2QlHCG0JWodRbOtcGeXGtcXuF5idid1jMrz6HUT8176Nw/ulW+PWRQE5qHCrWaM8Cc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=lsGNfofa; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=haqr5kX/; arc=none smtp.client-ip=193.142.43.55 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.b="lsGNfofa"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="haqr5kX/" From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1756837887; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Fanpy00esSnBGlX30vnme9VcWlTYggqUcX1WnDOVCMg=; b=lsGNfofaJxLUk0sg0yJJMG4QpXH/B/2hzGcIREa4XFk+gV+fYWV7d5ZUEsIDHk/oFVltsY 3Ru+hW6QTECSx7PThf0knJVaWuqgzhW7dEKZW22fbozfPOF6MR+yP8WXs1GZ7qU/zvRdvX 2nK6YtLddwhX5ZPzwsNIds1iBEFe5CEbhraUlNtIU3Qg0L0JMziA6UkJr8lMt5xw6VccHs KQkbcK+0ZVudjfZplAQeMrnRo9CG5gVGLfdUBzHNXyeyuQUu90192BCbfeNqGVMZh8YorV EbXNAwb3R+qYQIjST29e7jyKmdM9zXWlVuU+0Xi9dNfouTnDzxPRMJBzJlyPlw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1756837887; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Fanpy00esSnBGlX30vnme9VcWlTYggqUcX1WnDOVCMg=; b=haqr5kX/r7lmJ6xoCoqO8/y/aAfmAcgGPE1zSMtGCDj3EvL0lTrq06zI8+wY2LnuGbJ2UH VpW2BFkThyPJx5DA== To: Mathieu Desnoyers , LKML Cc: Jens Axboe , Peter Zijlstra , "Paul E. McKenney" , Boqun Feng , Paolo Bonzini , Sean Christopherson , Wei Liu , Dexuan Cui , x86@kernel.org, Arnd Bergmann , Heiko Carstens , Christian Borntraeger , Sven Schnelle , Huacai Chen , Paul Walmsley , Palmer Dabbelt Subject: Re: [patch V2 27/37] rseq: Implement fast path for exit to user In-Reply-To: <8d2380be-20c1-4c0d-8067-efedcce6c9d5@efficios.com> References: <20250823161326.635281786@linutronix.de> <20250823161655.000005616@linutronix.de> <8d2380be-20c1-4c0d-8067-efedcce6c9d5@efficios.com> Date: Tue, 02 Sep 2025 20:31:26 +0200 Message-ID: <87ldmwzoxt.ffs@tglx> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Tue, Aug 26 2025 at 11:33, Mathieu Desnoyers wrote: > On 2025-08-23 12:40, Thomas Gleixner wrote: >> + * A sane compiler requires four instructions for the nothing to do >> + * case including clearing the events, but your milage might vary. > > See my earlier comments about: > > - Handling of dynamic numa node id to cpu mapping reconfiguration on > powerpc. Still not relevant :) > - Validation of the abort handler signature on production kernels. Brought it back already.