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 9C5908BE0 for ; Tue, 28 Mar 2023 14:51:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1EA19C4339B; Tue, 28 Mar 2023 14:51:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680015110; bh=CWlBYcUlEtV2WK9oxcnRHyaRYGfQvTSR1XBD+I+3xUE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BA6sWbHapOxXA8817LMVQxNkAgBfjlAqcvCBU+vsBx+vP5HOODYWBO9dicKCgYVEq Gb39tT2FntFJtQSL/OpCg+JDqaSW9Oz8I1V/2mcNWujH8Anu7qdpBXzzenljfvDB4o V08HObasBHL7KMYcXNbErg4JHXcj2ilktAlB0QDw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kars de Jong , Geert Uytterhoeven , Sasha Levin Subject: [PATCH 6.2 138/240] m68k: mm: Fix systems with memory at end of 32-bit address space Date: Tue, 28 Mar 2023 16:41:41 +0200 Message-Id: <20230328142625.506327581@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230328142619.643313678@linuxfoundation.org> References: <20230328142619.643313678@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: Kars de Jong [ Upstream commit 0d9fad91abfd723ea5070a46d98a9f4496c93ba9 ] The calculation of end addresses of memory chunks overflowed to 0 when a memory chunk is located at the end of 32-bit address space. This is the case for the HP300 architecture. Link: https://lore.kernel.org/linux-m68k/CACz-3rhUo5pgNwdWHaPWmz+30Qo9xCg70wNxdf7o5x-6tXq8QQ@mail.gmail.com/ Signed-off-by: Kars de Jong Reviewed-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/20230223112349.26675-1-jongk@linux-m68k.org Signed-off-by: Geert Uytterhoeven Signed-off-by: Sasha Levin --- arch/m68k/mm/motorola.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c index 2a375637e0077..9113012240789 100644 --- a/arch/m68k/mm/motorola.c +++ b/arch/m68k/mm/motorola.c @@ -437,7 +437,7 @@ void __init paging_init(void) } min_addr = m68k_memory[0].addr; - max_addr = min_addr + m68k_memory[0].size; + max_addr = min_addr + m68k_memory[0].size - 1; memblock_add_node(m68k_memory[0].addr, m68k_memory[0].size, 0, MEMBLOCK_NONE); for (i = 1; i < m68k_num_memory;) { @@ -452,21 +452,21 @@ void __init paging_init(void) } memblock_add_node(m68k_memory[i].addr, m68k_memory[i].size, i, MEMBLOCK_NONE); - addr = m68k_memory[i].addr + m68k_memory[i].size; + addr = m68k_memory[i].addr + m68k_memory[i].size - 1; if (addr > max_addr) max_addr = addr; i++; } m68k_memoffset = min_addr - PAGE_OFFSET; - m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6; + m68k_virt_to_node_shift = fls(max_addr - min_addr) - 6; module_fixup(NULL, __start_fixup, __stop_fixup); flush_icache(); - high_memory = phys_to_virt(max_addr); + high_memory = phys_to_virt(max_addr) + 1; min_low_pfn = availmem >> PAGE_SHIFT; - max_pfn = max_low_pfn = max_addr >> PAGE_SHIFT; + max_pfn = max_low_pfn = (max_addr >> PAGE_SHIFT) + 1; /* Reserve kernel text/data/bss and the memory allocated in head.S */ memblock_reserve(m68k_memory[0].addr, availmem - m68k_memory[0].addr); -- 2.39.2