From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A4433E9B35E for ; Mon, 2 Mar 2026 10:44:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=n0zLKLtB5A7zru2ahcIUFI/0NS64SB8AC7f0H7kN8aQ=; b=1CnsTa/7d1j3S5XrZtcXmK0mDU dgdtuDU/KZybjZBRsuLki3FhsgG8b41R3uMYFdY8Y5/fqhlAOC3DzGBAboWTmCe9G8C1xtWlCPRl3 FUHWX+9/U0f+oB/L/JTPkrjqI62rMBUTKtquvF84m+vlat3MzJ3mwg3FDcPrrXrleyiOKOJtvwhxd ZTSAQNYrj9HOJfpwx6eGgquBUfsiyC3as4mirqFOsgXZU7pa0HAmBrCQ+54ESp1vP82cNmGewzcOo l4IegfE4RfTtdo13RT3feeygAKZ28jWcHqa4CLSmPFcf4uuHDwIee0qwOuZaAtktkYuyCB86B5E2h g9ny8mQw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vx0km-0000000CjNt-0wmk; Mon, 02 Mar 2026 10:43:56 +0000 Received: from galois.linutronix.de ([2a0a:51c0:0:12e:550::1]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vx0kk-0000000CjNP-1O39 for linux-arm-kernel@lists.infradead.org; Mon, 02 Mar 2026 10:43:55 +0000 Date: Mon, 2 Mar 2026 11:43:51 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1772448232; 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=n0zLKLtB5A7zru2ahcIUFI/0NS64SB8AC7f0H7kN8aQ=; b=POieAP56h6+EUimzNHr1QIXuhdRMFHnsWSD9O7dhECwq6nKFsDhzAzUpqHBqjz8t0ziLVj ye3qvNWHsYvVxYLD4xcKeUad1ZCDGNMuaeprWloJyzSTLkelFvaDN560AhA/6wFapZyy4H 0P+v5rt8EDBgikY4QdAmh0K35fOJu27mh+DwoblNtsSaAQVyX0gej07v2PkIlM1nDbXMze qrnQLkJCiUPfZO59LYc2Mgg4WLa3G8Z/gqiWv3d1USbieAXLciHwTYm9HWBQF2JlUJCGHo T6Xx/e0zdHEdu6a7oc56sURg7cQsbmWuMy87ullACwz2E2YyMdq28Y7mdFEKCg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1772448232; 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=n0zLKLtB5A7zru2ahcIUFI/0NS64SB8AC7f0H7kN8aQ=; b=EZUWSgnMd/Mkt//b0cYqq7JbPWZYKwsKHKmTMXm8JVUnVvnTUAX/Q8/2b+2S+vYyoBK8It OhAsdi09nhhhXnAw== From: Sebastian Andrzej Siewior To: "Russell King (Oracle)" Cc: linux-arm-kernel@lists.infradead.org, Clark Williams , linux-rt-devel@lists.linux.dev, Steven Rostedt Subject: Re: [PATCH 2/6] ARM: move vmalloc() lazy-page table population Message-ID: <20260302104351.yyWvNCTb@linutronix.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260302_024354_510024_9F5F5F07 X-CRM114-Status: UNSURE ( 9.88 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2026-02-27 15:19:13 [+0000], Russell King (Oracle) wrote: > Split the vmalloc() lazy-page table population from > do_translation_fault() into a new vmalloc_fault() function. > > Signed-off-by: Russell King (Oracle) Reviewed-by: Sebastian Andrzej Siewior > --- a/arch/arm/mm/fault.c > +++ b/arch/arm/mm/fault.c > @@ -261,6 +261,70 @@ static inline bool ttbr0_usermode_access_allowed(struct pt_regs *regs) > } > #endif > > +/* > + * Handle a vmalloc fault, copying the non-leaf page table entries from > + * init_mm.pgd. Any kernel context can trigger this, so we must not sleep > + * or enable interrupts. Having two CPUs execute this for the same page is "unconditionally enable interrupts."? It wouldn't be wrong to enable them if the calling context had them enabled, right? > + * no problem, we'll just copy the same data twice. > + * > + * Returns false on failure. > + */ > +static bool __kprobes __maybe_unused vmalloc_fault(unsigned long addr) Maybe handle_vmalloc_fault(). > +{ Sebastian