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Wed, 29 Apr 2026 18:05:14 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1777478714; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=EBEyBa7Rph51aBo1JjddMSs3BFPbJQoH8pdrtEkDmzw=; b=IeSI53bMf7UWhWLp7hjI0kjSd6OaZw6ahRuuKpMgPpv03+eWRi+QA8mjNcvrbjOk7S+ADa 1Lu+Vvm4BPI5U7ztma0W6sFzDWTpN7bVRp+AwGFEZIStrHToKJlnLB8EFwFjBdmAzuQu48 OHlHKoKsWPvo15s1VL50JQmaBrbhoRvO6jkOTSr6XP4DBFwowa3P1IWLSsTiRC1Q8eqtWj Fi2QKLMNlF3b+Pq/q0dTVmBMaoFmZQ7P66rYrzeIUn7o9L7LvHnuOFb6GZOC4rfnqTBjCd OjwWTd+JilnYRyjBAr3b/lg/0Q8NeCSF8U/CrOKv8WgQirJC5lItsICyI14OEA== Message-ID: <69f83cbd-8883-4ead-b570-4520379b86e4@mailbox.org> Date: Wed, 29 Apr 2026 18:05:06 +0200 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Subject: Re: iov_kunit_copy_to_kvec: ASSERTION FAILED at lib/tests/kunit_iov_iter.c:63, Expected got == npages, but, got == 1 (0x1), npages == 256 (0x100) (v7.0.2, ppc) To: LEROY Christophe , "linux-hardening@vger.kernel.org" , Kees Cook , David Howells Cc: "linuxppc-dev@lists.ozlabs.org" References: <2708666d-68f8-4cd3-9b25-f14ceeba3a1f@mailbox.org> Content-Language: en-US, de-DE From: Erhard Furtner In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-MBO-RS-ID: c64d262b5b61b60f041 X-MBO-RS-META: bxhznyrzqwkwj7pbb5n84a5p5sm6zsxr > This happens in alloc_pages_bulk_noprof(), due to > > pcp = pcp_spin_trylock(zone->per_cpu_pageset); > if (!pcp) > goto failed; > > Because: > > #ifdef CONFIG_SMP > [...] > /* > * On CONFIG_SMP=n the UP implementation of spin_trylock() never fails > and thus > * is not compatible with our locking scheme. However we do not need > pcp for > * scalability in the first place, so just make all the trylocks fail > and take > * the slow path unconditionally. > */ > #else > #define pcp_spin_trylock(ptr) \ > NULL > > > So apparently it is expected that alloc_pages_bulk() returns 1 on non-SMP. > > Christophe I got SMP set as my G4 DP got 2 x 7450 cpus. I can attach full kernel .config when I return on Saturday. Regards, Erhard