From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 539524680 for ; Wed, 9 Aug 2023 11:43:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA87FC433C8; Wed, 9 Aug 2023 11:43:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691581388; bh=ybseqyWhUpJ0uvBEMRC5EP+T66CKprywQss8Y2bfgfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xct1bQZxBNvppRmV3FTFrwnEBibbdd/dHpOSvgc6JNkS9uo+91kIFHL9SHNph8IPW JLjtL10s6bmbAKg7XI4rtfX8zFWm/KMeoJJnD00+MTNEjgkVUqdqvY0LjlG/QEJlbS TKwfBksUeFPjRpUkADVESX3L+/2GVHIe7MM0eFL0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Aneesh Kumar K.V" , David Hildenbrand , Michael Ellerman , Sasha Levin Subject: [PATCH 5.10 185/201] powerpc/mm/altmap: Fix altmap boundary check Date: Wed, 9 Aug 2023 12:43:07 +0200 Message-ID: <20230809103649.996200414@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103643.799166053@linuxfoundation.org> References: <20230809103643.799166053@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Aneesh Kumar K.V [ Upstream commit 6722b25712054c0f903b839b8f5088438dd04df3 ] altmap->free includes the entire free space from which altmap blocks can be allocated. So when checking whether the kernel is doing altmap block free, compute the boundary correctly, otherwise memory hotunplug can fail. Fixes: 9ef34630a461 ("powerpc/mm: Fallback to RAM if the altmap is unusable") Signed-off-by: "Aneesh Kumar K.V" Reviewed-by: David Hildenbrand Signed-off-by: Michael Ellerman Link: https://msgid.link/20230724181320.471386-1-aneesh.kumar@linux.ibm.com Signed-off-by: Sasha Levin --- arch/powerpc/mm/init_64.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index b76cd49d521b9..db040f34c0046 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -313,8 +313,7 @@ void __ref vmemmap_free(unsigned long start, unsigned long end, start = ALIGN_DOWN(start, page_size); if (altmap) { alt_start = altmap->base_pfn; - alt_end = altmap->base_pfn + altmap->reserve + - altmap->free + altmap->alloc + altmap->align; + alt_end = altmap->base_pfn + altmap->reserve + altmap->free; } pr_debug("vmemmap_free %lx...%lx\n", start, end); -- 2.40.1