From nobody Tue Apr 7 11:19:07 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87105FA3740 for ; Tue, 1 Nov 2022 02:47:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229919AbiKACrz (ORCPT ); Mon, 31 Oct 2022 22:47:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229832AbiKACrw (ORCPT ); Mon, 31 Oct 2022 22:47:52 -0400 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6C1517894 for ; Mon, 31 Oct 2022 19:47:51 -0700 (PDT) Received: by mail-pg1-x535.google.com with SMTP id q1so12282069pgl.11 for ; Mon, 31 Oct 2022 19:47:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=XGwO4GhQFCnfEGWVPRq8FBqqasnQ0/oWKbkrBe1VfIA=; b=mTkPZRYDYhw7QQ4scrrL39McOrmqG4T2zdd9b1wJc1nA4b4vOHpdpe2kQIBil7+LLD 2ZRTIHbgqZo1u2pX5NK3RY9NdieoqMYh3AxjH+xsnP+X5JoUdv7ApEWQdqDJz4DNzFa+ RX0mx/sFa46oPS5LrNP+0FUWDUjDgei/9C7J4jMn6S8MnRfvipYU+Do7DzYSDJU4SdY2 l5//Wj1X/eibK1Pg3kEj/kryDik3M4ZOjdyIqIskK+IE2rgOMevVRB2ZyFv/OhlZE97L h19CJ8DsgqfSkhUIRSTuFucLbA+2+L3ZTWUZVjx9v6I4QDLMEuHXB59VWI4Ep6PsaiXi fQoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=XGwO4GhQFCnfEGWVPRq8FBqqasnQ0/oWKbkrBe1VfIA=; b=WsivHhmQyhqH3x3tOq61unjGCo6GvBrD1o3B/9wPCM6joWfaFRuVAg/gcAx6nGkTkR PMh5WgpmBZiLUu9g4iu+z20LWJsCI6jeOYzdNwZ6M1tpJsA4CoYtV7bc0T2HN/ml6KBh G6uFn/4z6LVfzVPa+0DWX86AH9GPkVS2MTg63KnNnynOqOTJR4ShbfCWPLrU5qnPt369 9zkY7+7uC7L85suxpQXlgo1Si8d9vDm1SWkLakCxFvxhHbSPm+1aPZz/jwrOpQxHB32k WVFZB0gWp8R+B1LFttz2vGgX+nuDOGRQRGyjrPWcWs72xGjGOs0mf7mFky+I0o8VNLfZ Su8g== X-Gm-Message-State: ACrzQf1e1k5FIxLSrqr4padZMO4AjHtUNhKaBrPCsdRHT6kmM9L5erUt d2AzeVt0T6rl5/RSc27+Mkx9wQ== X-Google-Smtp-Source: AMsMyM4bSE21Et48MZZyhTXTYW43mn8i8pnopd2pfokIMPIlsGH1+7KrDx+RdzUA6tPxeJw2/pX3pw== X-Received: by 2002:a62:4c6:0:b0:55f:c739:51e0 with SMTP id 189-20020a6204c6000000b0055fc73951e0mr17184994pfe.49.1667270871297; Mon, 31 Oct 2022 19:47:51 -0700 (PDT) Received: from localhost.localdomain (80.251.214.228.16clouds.com. [80.251.214.228]) by smtp.gmail.com with ESMTPSA id y4-20020a170902ed4400b001714c36a6e7sm5079570plb.284.2022.10.31.19.47.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 19:47:50 -0700 (PDT) From: Shawn Guo To: "Rafael J . Wysocki" Cc: Kevin Hilman , Ulf Hansson , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Guo Subject: [PATCH v2 1/3] PM: domains: Pass generic PM noirq hooks to genpd_finish_suspend() Date: Tue, 1 Nov 2022 10:47:34 +0800 Message-Id: <20221101024736.1509207-2-shawn.guo@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221101024736.1509207-1-shawn.guo@linaro.org> References: <20221101024736.1509207-1-shawn.guo@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" While argument `poweroff` works fine for genpd_finish_suspend() to handle distinction between suspend and poweroff, it won't scale if we want to use it for freeze as well. Pass generic PM noirq hooks as arguments instead, so that the function can possibly cover freeze case too. Signed-off-by: Shawn Guo Reviewed-by: Ulf Hansson --- drivers/base/power/domain.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 6471b559230e..54f6b0dd35fb 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1189,12 +1189,15 @@ static int genpd_prepare(struct device *dev) * genpd_finish_suspend - Completion of suspend or hibernation of device i= n an * I/O pm domain. * @dev: Device to suspend. - * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callb= ack. + * @suspend_noirq: Generic suspend_noirq callback. + * @resume_noirq: Generic resume_noirq callback. * * Stop the device and remove power from the domain if all devices in it h= ave * been stopped. */ -static int genpd_finish_suspend(struct device *dev, bool poweroff) +static int genpd_finish_suspend(struct device *dev, + int (*suspend_noirq)(struct device *dev), + int (*resume_noirq)(struct device *dev)) { struct generic_pm_domain *genpd; int ret =3D 0; @@ -1203,10 +1206,7 @@ static int genpd_finish_suspend(struct device *dev, = bool poweroff) if (IS_ERR(genpd)) return -EINVAL; =20 - if (poweroff) - ret =3D pm_generic_poweroff_noirq(dev); - else - ret =3D pm_generic_suspend_noirq(dev); + ret =3D suspend_noirq(dev); if (ret) return ret; =20 @@ -1217,10 +1217,7 @@ static int genpd_finish_suspend(struct device *dev, = bool poweroff) !pm_runtime_status_suspended(dev)) { ret =3D genpd_stop_dev(genpd, dev); if (ret) { - if (poweroff) - pm_generic_restore_noirq(dev); - else - pm_generic_resume_noirq(dev); + resume_noirq(dev); return ret; } } @@ -1244,7 +1241,9 @@ static int genpd_suspend_noirq(struct device *dev) { dev_dbg(dev, "%s()\n", __func__); =20 - return genpd_finish_suspend(dev, false); + return genpd_finish_suspend(dev, + pm_generic_suspend_noirq, + pm_generic_resume_noirq); } =20 /** @@ -1353,7 +1352,9 @@ static int genpd_poweroff_noirq(struct device *dev) { dev_dbg(dev, "%s()\n", __func__); =20 - return genpd_finish_suspend(dev, true); + return genpd_finish_suspend(dev, + pm_generic_poweroff_noirq, + pm_generic_restore_noirq); } =20 /** --=20 2.25.1 From nobody Tue Apr 7 11:19:07 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B04A9FA3741 for ; Tue, 1 Nov 2022 02:48:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229937AbiKACsB (ORCPT ); Mon, 31 Oct 2022 22:48:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229928AbiKACr4 (ORCPT ); Mon, 31 Oct 2022 22:47:56 -0400 Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58ACC17A8F for ; Mon, 31 Oct 2022 19:47:55 -0700 (PDT) Received: by mail-pj1-x1036.google.com with SMTP id o7so8801519pjj.1 for ; Mon, 31 Oct 2022 19:47:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=jbrdZ3AfNBZwnOI0fG3SRJzo0Qc3Dqvr8k7roe04PJI=; b=HWqorN7Mn3JENdNCLQsXnKQ+LlgwfD3rhZ8l+NteXzFRkW08IFKMUxsFk45ZA5CXQN WpKxiy1ayugBAnoB7oC0WN9m4v3O9mkQ5V+ooBuIsjXhq9l0uJvnJNs3IKkbh2wbAC7Z GjcFGu7tJqVjoOTotKBJErQ4sKFIMu4jt52yxLL73oTfb8pumbi2Uh2cj0VE6EO8gpqC KhD7vu4KOVapF/OEyiiSdwSk02kD7Lmk9aHis/3wVND+YF2K77DFdaVjzyeMTUIOqg7T E53odfale8+xgW9HpsKwHwzcwsKqruUwYKIFZ88wov0TR7JaE1B1q8YTa6D4IXxStOO3 QqjA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=jbrdZ3AfNBZwnOI0fG3SRJzo0Qc3Dqvr8k7roe04PJI=; b=LBBo77swdfCh/SbMAMPbtR18BExYEkaE6f0Nmw+kxGh0T0IqVGNvTPffHSU8mlmwt2 W6CKEKFoyGFbCGKDvQbQgFRzrSCVR4RCS+fblZA+teziQfWPKh2hwd0XDSx3DTmI0sm6 d24jZ5PuZzyJCCEpniI+1PCZgXCjAUQ35QR5d/1tHQA7au0XMLw1bfQA9TIM/WN6gi3q beKPzezQr5lU9R171ovh+816BGiJfYwGsNEEfMZQH4uX+loGAxpSviryl1xJlrztrpqz W6Q/uYe7LTRXFPvqmbja/Gn1mCndbipJEETr3ymz0wG6aMz9hhvCTeUdAmE3RM2jedta shNQ== X-Gm-Message-State: ACrzQf39uxtO+IMhPTe0IrzvZPPS8PuoKD5OxqqAgEEF9+M6RGgcptC6 WSCTK29LvjZE5pWpmM1+PviSbQ== X-Google-Smtp-Source: AMsMyM578K2t931v1WIdEmHhbcDfsuvlv5gnCIcnBAz1zAhZVD9B5u759hMN4oDrMIEob3N7Bpfa3Q== X-Received: by 2002:a17:902:8c8f:b0:186:b6ad:3592 with SMTP id t15-20020a1709028c8f00b00186b6ad3592mr17430451plo.119.1667270874862; Mon, 31 Oct 2022 19:47:54 -0700 (PDT) Received: from localhost.localdomain (80.251.214.228.16clouds.com. [80.251.214.228]) by smtp.gmail.com with ESMTPSA id y4-20020a170902ed4400b001714c36a6e7sm5079570plb.284.2022.10.31.19.47.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 19:47:54 -0700 (PDT) From: Shawn Guo To: "Rafael J . Wysocki" Cc: Kevin Hilman , Ulf Hansson , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Guo Subject: [PATCH v2 2/3] PM: domains: Consolidate genpd_restore_noirq() and genpd_resume_noirq() Date: Tue, 1 Nov 2022 10:47:35 +0800 Message-Id: <20221101024736.1509207-3-shawn.guo@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221101024736.1509207-1-shawn.guo@linaro.org> References: <20221101024736.1509207-1-shawn.guo@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Most of the logic between genpd_restore_noirq() and genpd_resume_noirq() are same except GENPD_STATE_OFF status reset for hibernation restore. The suspended_count decrement for restore should be the right thing to do anyway, considering there is an increment in genpd_finish_suspend() for hibernation. Consolidate genpd_restore_noirq() and genpd_resume_noirq() into genpd_finish_resume() and handle GENPD_STATE_OFF status reset for restore case specially. Signed-off-by: Shawn Guo Reviewed-by: Ulf Hansson --- drivers/base/power/domain.c | 70 ++++++++++++++++++------------------- 1 file changed, 35 insertions(+), 35 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 54f6b0dd35fb..b81baeb38d81 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1247,12 +1247,14 @@ static int genpd_suspend_noirq(struct device *dev) } =20 /** - * genpd_resume_noirq - Start of resume of device in an I/O PM domain. + * genpd_finish_resume - Completion of resume of device in an I/O PM domai= n. * @dev: Device to resume. + * @resume_noirq: Generic resume_noirq callback. * * Restore power to the device's PM domain, if necessary, and start the de= vice. */ -static int genpd_resume_noirq(struct device *dev) +static int genpd_finish_resume(struct device *dev, + int (*resume_noirq)(struct device *dev)) { struct generic_pm_domain *genpd; int ret; @@ -1264,9 +1266,25 @@ static int genpd_resume_noirq(struct device *dev) return -EINVAL; =20 if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) - return pm_generic_resume_noirq(dev); + return resume_noirq(dev); =20 genpd_lock(genpd); + + /* + * Special handling for hibernation restore: + * At this point suspended_count =3D=3D 0 means we are being run for the + * first time for the given domain in the present cycle. + */ + if (resume_noirq =3D=3D pm_generic_restore_noirq && + genpd->suspended_count++ =3D=3D 0) { + /* + * The boot kernel might put the domain into arbitrary state, + * so make it appear as powered off to genpd_sync_power_on(), + * so that it tries to power it on in case it was really off. + */ + genpd->status =3D GENPD_STATE_OFF; + } + genpd_sync_power_on(genpd, true, 0); genpd->suspended_count--; genpd_unlock(genpd); @@ -1281,6 +1299,19 @@ static int genpd_resume_noirq(struct device *dev) return pm_generic_resume_noirq(dev); } =20 +/** + * genpd_resume_noirq - Start of resume of device in an I/O PM domain. + * @dev: Device to resume. + * + * Restore power to the device's PM domain, if necessary, and start the de= vice. + */ +static int genpd_resume_noirq(struct device *dev) +{ + dev_dbg(dev, "%s()\n", __func__); + + return genpd_finish_resume(dev, pm_generic_resume_noirq); +} + /** * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domai= n. * @dev: Device to freeze. @@ -1366,40 +1397,9 @@ static int genpd_poweroff_noirq(struct device *dev) */ static int genpd_restore_noirq(struct device *dev) { - struct generic_pm_domain *genpd; - int ret =3D 0; - dev_dbg(dev, "%s()\n", __func__); =20 - genpd =3D dev_to_genpd(dev); - if (IS_ERR(genpd)) - return -EINVAL; - - /* - * At this point suspended_count =3D=3D 0 means we are being run for the - * first time for the given domain in the present cycle. - */ - genpd_lock(genpd); - if (genpd->suspended_count++ =3D=3D 0) { - /* - * The boot kernel might put the domain into arbitrary state, - * so make it appear as powered off to genpd_sync_power_on(), - * so that it tries to power it on in case it was really off. - */ - genpd->status =3D GENPD_STATE_OFF; - } - - genpd_sync_power_on(genpd, true, 0); - genpd_unlock(genpd); - - if (genpd->dev_ops.stop && genpd->dev_ops.start && - !pm_runtime_status_suspended(dev)) { - ret =3D genpd_start_dev(genpd, dev); - if (ret) - return ret; - } - - return pm_generic_restore_noirq(dev); + return genpd_finish_resume(dev, pm_generic_restore_noirq); } =20 /** --=20 2.25.1 From nobody Tue Apr 7 11:19:07 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22200FA3740 for ; Tue, 1 Nov 2022 02:48:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229952AbiKACsG (ORCPT ); Mon, 31 Oct 2022 22:48:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229934AbiKACr7 (ORCPT ); Mon, 31 Oct 2022 22:47:59 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD31517A98 for ; Mon, 31 Oct 2022 19:47:58 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id i3so12291270pfc.11 for ; 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[80.251.214.228]) by smtp.gmail.com with ESMTPSA id y4-20020a170902ed4400b001714c36a6e7sm5079570plb.284.2022.10.31.19.47.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 19:47:57 -0700 (PDT) From: Shawn Guo To: "Rafael J . Wysocki" Cc: Kevin Hilman , Ulf Hansson , Len Brown , Pavel Machek , Greg Kroah-Hartman , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Guo Subject: [PATCH v2 3/3] PM: domains: Power off[on] domain in hibernate .freeze[thaw]_noirq hook Date: Tue, 1 Nov 2022 10:47:36 +0800 Message-Id: <20221101024736.1509207-4-shawn.guo@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221101024736.1509207-1-shawn.guo@linaro.org> References: <20221101024736.1509207-1-shawn.guo@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On platforms which use SHUTDOWN as hibernation mode, the genpd noirq hooks will be called like below. genpd_freeze_noirq() genpd_restore_noirq() =E2=86=93 =E2=86=91 Create snapshot image Restore system =E2=86=93 =E2=86=91 genpd_thaw_noirq() Read snapshot image =E2=86=93 =E2=86=91 Write snapshot image Kernel boot =E2=86=93 =E2=86=91 power_down() Power on device As of today suspend hooks genpd_suspend[resume]_noirq() manages domain on/off state, but hibernate hooks genpd_freeze[thaw]_noirq() doesn't. This results in a different behavior of domain power state between suspend and hibernate freeze, i.e. domain is powered off for the former while on for the later. It causes a problem on platforms like i.MX where the domain needs to be powered on/off by calling clock and regulator interface. When the platform restores from hibernation, the domain is off in hardware and genpd_restore_noirq() tries to power it on, but will never succeed because software state of domain (clock and regulator) is left on from the last hibernate freeze, so kernel thinks that clock and regulator are enabled while they are actually not turned on in hardware. The consequence would be that devices in the power domain will access registers without clock or power, and cause hardware lockup. Power off[on] domain in hibernate .freeze[thaw]_noirq hook for reasons: - Align the behavior between suspend and hibernate freeze. - Have power state of domains stay in sync between hardware and software for hibernate freeze, and thus fix the lockup issue seen on i.MX platform. Signed-off-by: Shawn Guo Reviewed-by: Ulf Hansson --- drivers/base/power/domain.c | 35 ++++------------------------------- 1 file changed, 4 insertions(+), 31 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index b81baeb38d81..28c9e04e3488 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1323,24 +1323,11 @@ static int genpd_resume_noirq(struct device *dev) */ static int genpd_freeze_noirq(struct device *dev) { - const struct generic_pm_domain *genpd; - int ret =3D 0; - dev_dbg(dev, "%s()\n", __func__); =20 - genpd =3D dev_to_genpd(dev); - if (IS_ERR(genpd)) - return -EINVAL; - - ret =3D pm_generic_freeze_noirq(dev); - if (ret) - return ret; - - if (genpd->dev_ops.stop && genpd->dev_ops.start && - !pm_runtime_status_suspended(dev)) - ret =3D genpd_stop_dev(genpd, dev); - - return ret; + return genpd_finish_suspend(dev, + pm_generic_freeze_noirq, + pm_generic_thaw_noirq); } =20 /** @@ -1352,23 +1339,9 @@ static int genpd_freeze_noirq(struct device *dev) */ static int genpd_thaw_noirq(struct device *dev) { - const struct generic_pm_domain *genpd; - int ret =3D 0; - dev_dbg(dev, "%s()\n", __func__); =20 - genpd =3D dev_to_genpd(dev); - if (IS_ERR(genpd)) - return -EINVAL; - - if (genpd->dev_ops.stop && genpd->dev_ops.start && - !pm_runtime_status_suspended(dev)) { - ret =3D genpd_start_dev(genpd, dev); - if (ret) - return ret; - } - - return pm_generic_thaw_noirq(dev); + return genpd_finish_resume(dev, pm_generic_thaw_noirq); } =20 /** --=20 2.25.1