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 9DDD3C624B4 for ; Thu, 23 Nov 2023 13:27:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=mjols0TXuVK4a7CwuV9RlnzEybdDzRXfu8zcNA5YmnU=; b=uDUamM3HPX0cyd CIx4q4jtEZVEpjG/MeYs28AeG4hzcLBJ/yKr4ysqYyQeD2009Smw1qdUrdqUwGTG1K3Sgw+jyYy+B ll72GAM9UQNnyJxto1Sn/5vn/dcwE5gKWkF3+7JhpnOHpjRC1tomxARBN+11xU2+mH3Tu/++RbGBZ P2u01+HzVnM6lUX1CCDlGt3tAcBVxNHoF12o50vQgngRp8Bcv2Wl1/IoaOxLs+MYLtWjhU/WtXvoj i8KvyBmdRJTyH5j0WaR9sLiZJEl4oLSFqB0iLY83Z1Y6ZrTQOPydJC5iyRCnJeJAfJRmGckMDbZZB hofmqpZtlyctcdbflZ+Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r69kD-004stb-0H; Thu, 23 Nov 2023 13:27:49 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r69k9-004ss1-0J for linux-riscv@lists.infradead.org; Thu, 23 Nov 2023 13:27:46 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1700746063; 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=XlCNcFS7+nGLr8i/szhMFxjsyTieH5TNHlOyuSvsHHk=; b=PZFzrydqZjS3A9XlaeRAJRz1j8ZlE3V7H4VFf3rMIsLhSbZ8Fk+h4vfi2IYZ6H5qw3vs/s MgnSsGmFNGVb8larRVrs0OelaRojawCEzl3j2Uyo9M7a+FKJXKUulGupHa2BLChbDM/+BV Rti0IvreMgkiNHijaM2rM1Fx+k/bOS4= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-313-LNixVYSgNR6zfKelwTaWZg-1; Thu, 23 Nov 2023 08:27:38 -0500 X-MC-Unique: LNixVYSgNR6zfKelwTaWZg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 368F43C027B1; Thu, 23 Nov 2023 13:27:38 +0000 (UTC) Received: from localhost (unknown [10.72.112.97]) by smtp.corp.redhat.com (Postfix) with ESMTPS id AB1BD36E2; Thu, 23 Nov 2023 13:27:29 +0000 (UTC) Date: Thu, 23 Nov 2023 21:27:25 +0800 From: Baoquan He To: akpm@linux-foundation.org Cc: kexec@lists.infradead.org, x86@kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, ebiederm@xmission.com, takahiro.akashi@linaro.org Subject: Re: [PATCH v2 1/2] resource: add walk_system_ram_res_rev() Message-ID: References: <20231114091658.228030-1-bhe@redhat.com> <20231114091658.228030-2-bhe@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231123_052745_222074_73F1925A X-CRM114-Status: GOOD ( 24.97 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Hi Andrew, On 11/15/23 at 09:00pm, Baoquan He wrote: > This function, being a variant of walk_system_ram_res() introduced in > commit 8c86e70acead ("resource: provide new functions to walk through > resources"), walks through a list of all the resources of System RAM > in reversed order, i.e., from higher to lower. > > It will be used in kexec_file code to load kernel, initrd etc when > preparing kexec reboot. > > Signed-off-by: AKASHI Takahiro > Signed-off-by: Baoquan He > --- > v1->v2: > - Use kvrealloc() to reallocate memory instead of kvcalloc(), this > simplifies code. Suggested by Andrew. > > include/linux/ioport.h | 3 +++ > kernel/resource.c | 57 ++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 60 insertions(+) Gentle ping. Could you pick this patchset into next tree so that it can be run on testing robots? Thanks Baoquan > > diff --git a/include/linux/ioport.h b/include/linux/ioport.h > index 14f5cfabbbc8..db7fe25f3370 100644 > --- a/include/linux/ioport.h > +++ b/include/linux/ioport.h > @@ -331,6 +331,9 @@ extern int > walk_system_ram_res(u64 start, u64 end, void *arg, > int (*func)(struct resource *, void *)); > extern int > +walk_system_ram_res_rev(u64 start, u64 end, void *arg, > + int (*func)(struct resource *, void *)); > +extern int > walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, u64 end, > void *arg, int (*func)(struct resource *, void *)); > > diff --git a/kernel/resource.c b/kernel/resource.c > index 866ef3663a0b..e8a244300e5b 100644 > --- a/kernel/resource.c > +++ b/kernel/resource.c > @@ -27,6 +27,8 @@ > #include > #include > #include > +#include > +#include > #include > > > @@ -429,6 +431,61 @@ int walk_system_ram_res(u64 start, u64 end, void *arg, > func); > } > > +/* > + * This function, being a variant of walk_system_ram_res(), calls the @func > + * callback against all memory ranges of type System RAM which are marked as > + * IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY in reversed order, i.e., from > + * higher to lower. > + */ > +int walk_system_ram_res_rev(u64 start, u64 end, void *arg, > + int (*func)(struct resource *, void *)) > +{ > + struct resource res, *rams; > + int rams_size = 16, i; > + unsigned long flags; > + int ret = -1; > + > + /* create a list */ > + rams = kvcalloc(rams_size, sizeof(struct resource), GFP_KERNEL); > + if (!rams) > + return ret; > + > + flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; > + i = 0; > + while ((start < end) && > + (!find_next_iomem_res(start, end, flags, IORES_DESC_NONE, &res))) { > + if (i >= rams_size) { > + /* re-alloc */ > + struct resource *rams_new; > + > + rams_new = kvrealloc(rams, rams_size * sizeof(struct resource), > + (rams_size + 16) * sizeof(struct resource), > + GFP_KERNEL); > + if (!rams_new) > + goto out; > + > + rams = rams_new; > + rams_size += 16; > + } > + > + rams[i].start = res.start; > + rams[i++].end = res.end; > + > + start = res.end + 1; > + } > + > + /* go reverse */ > + for (i--; i >= 0; i--) { > + ret = (*func)(&rams[i], arg); > + if (ret) > + break; > + } > + > +out: > + kvfree(rams); > + return ret; > +} > + > /* > * This function calls the @func callback against all memory ranges, which > * are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY. > -- > 2.41.0 > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv