From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (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 5F88A31D36A for ; Wed, 14 Jan 2026 15:17:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=96.67.55.147 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768403875; cv=none; b=ue+0xgbvOA4qo8tDw8F+rWY5zWUP4If0tMcXH4UCUiGeJUyM7YBLihVDDzYxtqCUgHXrDfoAglnMDUrrMmUZtiNXzRlFlEaZJu5qjD+hVDtaY9Tfgm+bHptot6P4zoWSX9pOZ5lPsQ/pYziW23RUJVuzrZSr1WvZtXyV3ED+fyA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768403875; c=relaxed/simple; bh=lUVq1Hi1ytAlUOkqA56JvqqqhXGMZVF3TlYO4LK3N+k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=LZJA7H9J6zh1/eQv7hgbhrI8mvIYyV8ooQ1dSPjh/beCPVlU415xUy8mL9mha24AgmDKmK7i6mdOwiNffe/yJAP0p/v+T25I0rpzniTIvyhYv5Ub85ZmjKMXnkg9j17uaKbs9V7vzl27t6krWfiBWgHfPTM9asplZce4lWPY0sk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com; spf=pass smtp.mailfrom=surriel.com; dkim=pass (2048-bit key) header.d=surriel.com header.i=@surriel.com header.b=WoMEIbiq; arc=none smtp.client-ip=96.67.55.147 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=surriel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=surriel.com header.i=@surriel.com header.b="WoMEIbiq" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=surriel.com ; s=mail; h=MIME-Version:Content-Transfer-Encoding:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=lUVq1Hi1ytAlUOkqA56JvqqqhXGMZVF3TlYO4LK3N+k=; b=WoMEIbiqj2/RGRqSQxuDzdU32e 96wm5lqEYOAVra1Bac+05NYwIgvl8mwg/G5NTScLzCo3XJiV6EYOL3yocnjN/JlTdskTlmFyYslzH JkZvZ2x248jVgn+4L1d91QObBTfdN8EGwPfeXOk7xWfio6ABlrSmvpMb68IuhhG3HncAoJ03YvLe1 tty69n8WIc3CYnTbrEIlJoo9tRgipeKyEPai4fmJ18TZfO7ESVg2Y8OhqExMHKwChdTAiteEimdqg 6e8GPVjlEYUZudZvZ82qwGRVx1ck9UszCRIwGoLAKeO9C8RkbUhFMNxCuS+Gr48B+mB9NzJScZmxJ pXdO/6jA==; Received: from fangorn.home.surriel.com ([10.0.13.7]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.97.1) (envelope-from ) id 1vg2VB-000000006Xy-059C; Wed, 14 Jan 2026 10:09:42 -0500 Message-ID: <733058ef2a54dc8323835fc26ca3b402ced5fc7f.camel@surriel.com> Subject: Re: [PATCH] x86/mm: Hide mm_free_global_asid() definition under 'CONFIG_BROADCAST_TLB_FLUSH' From: Rik van Riel To: Hou Wenlong , linux-kernel@vger.kernel.org Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Andrew Morton , Will Deacon , Ryan Roberts , Jann Horn , Barry Song Date: Wed, 14 Jan 2026 10:09:42 -0500 In-Reply-To: References: Autocrypt: addr=riel@surriel.com; prefer-encrypt=mutual; keydata=mQENBFIt3aUBCADCK0LicyCYyMa0E1lodCDUBf6G+6C5UXKG1jEYwQu49cc/gUBTTk33A eo2hjn4JinVaPF3zfZprnKMEGGv4dHvEOCPWiNhlz5RtqH3SKJllq2dpeMS9RqbMvDA36rlJIIo47 Z/nl6IA8MDhSqyqdnTY8z7LnQHqq16jAqwo7Ll9qALXz4yG1ZdSCmo80VPetBZZPw7WMjo+1hByv/ lvdFnLfiQ52tayuuC1r9x2qZ/SYWd2M4p/f5CLmvG9UcnkbYFsKWz8bwOBWKg1PQcaYHLx06sHGdY dIDaeVvkIfMFwAprSo5EFU+aes2VB2ZjugOTbkkW2aPSWTRsBhPHhV6dABEBAAG0HlJpayB2YW4gU mllbCA8cmllbEByZWRoYXQuY29tPokBHwQwAQIACQUCW5LcVgIdIAAKCRDOed6ShMTeg05SB/986o gEgdq4byrtaBQKFg5LWfd8e+h+QzLOg/T8mSS3dJzFXe5JBOfvYg7Bj47xXi9I5sM+I9Lu9+1XVb/ r2rGJrU1DwA09TnmyFtK76bgMF0sBEh1ECILYNQTEIemzNFwOWLZZlEhZFRJsZyX+mtEp/WQIygHV WjwuP69VJw+fPQvLOGn4j8W9QXuvhha7u1QJ7mYx4dLGHrZlHdwDsqpvWsW+3rsIqs1BBe5/Itz9o 6y9gLNtQzwmSDioV8KhF85VmYInslhv5tUtMEppfdTLyX4SUKh8ftNIVmH9mXyRCZclSoa6IMd635 Jq1Pj2/Lp64tOzSvN5Y9zaiCc5FucXtB9SaWsgdmFuIFJpZWwgPHJpZWxAc3VycmllbC5jb20+iQE +BBMBAgAoBQJSLd2lAhsjBQkSzAMABgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRDOed6ShMTe g4PpB/0ZivKYFt0LaB22ssWUrBoeNWCP1NY/lkq2QbPhR3agLB7ZXI97PF2z/5QD9Fuy/FD/jddPx KRTvFCtHcEzTOcFjBmf52uqgt3U40H9GM++0IM0yHusd9EzlaWsbp09vsAV2DwdqS69x9RPbvE/Ne fO5subhocH76okcF/aQiQ+oj2j6LJZGBJBVigOHg+4zyzdDgKM+jp0bvDI51KQ4XfxV593OhvkS3z 3FPx0CE7l62WhWrieHyBblqvkTYgJ6dq4bsYpqxxGJOkQ47WpEUx6onH+rImWmPJbSYGhwBzTo0Mm G1Nb1qGPG+mTrSmJjDRxrwf1zjmYqQreWVSFEt26tBpSaWsgdmFuIFJpZWwgPHJpZWxAZmIuY29tP okBPgQTAQIAKAUCW5LbiAIbIwUJEswDAAYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AACgkQznneko TE3oOUEQgAsrGxjTC1bGtZyuvyQPcXclap11Ogib6rQywGYu6/Mnkbd6hbyY3wpdyQii/cas2S44N cQj8HkGv91JLVE24/Wt0gITPCH3rLVJJDGQxprHTVDs1t1RAbsbp0XTksZPCNWDGYIBo2aHDwErhI omYQ0Xluo1WBtH/UmHgirHvclsou1Ks9jyTxiPyUKRfae7GNOFiX99+ZlB27P3t8CjtSO831Ij0Ip QrfooZ21YVlUKw0Wy6Ll8EyefyrEYSh8KTm8dQj4O7xxvdg865TLeLpho5PwDRF+/mR3qi8CdGbkE c4pYZQO8UDXUN4S+pe0aTeTqlYw8rRHWF9TnvtpcNzZw== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-01-14 at 21:21 +0800, Hou Wenlong wrote: > When 'CONFIG_BROADCAST_TLB_FLUSH' is not enabled, > mm_free_global_asid() > remains a globally visible symbol and generates a useless function > call > to it in destroy_context(). Therefore, hide the mm_free_global_asid() > definition under 'CONFIG_BROADCAST_TLB_FLUSH' and provide a static > inline empty version when it is not enabled to remove the function > call. >=20 > Signed-off-by: Hou Wenlong This may not create any measurable speedups, since it's just one no-op function call in the exit path, but it does reduce the size of the kernel on 32 bit systems where CONFIG_BROADCAST_TLB_FLUSH is not enabled. Reviewed-by: Rik van Riel --=20 All Rights Reversed.