From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Salter Subject: [PATCH V4 0/3] mm: Add generic copy from early unmapped RAM Date: Mon, 17 Aug 2015 13:01:04 -0400 Message-ID: <1439830867-14935-1-git-send-email-msalter@redhat.com> Return-path: Sender: owner-linux-mm@kvack.org To: Catalin Marinas , Will Deacon , x86@kernel.org Cc: Andrew Morton , Arnd Bergmann , Ard Biesheuvel , Mark Rutland , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Mark Salter List-Id: linux-arch.vger.kernel.org When booting an arm64 kernel w/initrd using UEFI/grub, use of mem= will likely cut off part or all of the initrd. This leaves it outside the kernel linear map which leads to failure when unpacking. The x86 code has a similar need to relocate an initrd outside of mapped memory in some cases. The current x86 code uses early_memremap() to copy the original initrd from unmapped to mapped RAM. This patchset creates a generic copy_from_early_mem() utility based on that x86 code and has arm64 and x86 share it in their respective initrd relocation code. Changes from V3: * Fixed arm64 build error with !CONFIG_BLK_DEV_INITRD case * Fixed nonsensical comment in arm64 relocate_initrd() Changes from V2: * Fixed sparse warning in copy_from_early_mem() * Removed unneeded MAX_MAP_CHUNK from x86 setup.c * Moved #ifdef outside arm64 relocate_initrd() definition. Changes from V1: * Change cover letter subject to highlight the added generic code * Add patch for x86 to use common copy_from_early_mem() Mark Salter (3): mm: add utility for early copy from unmapped ram arm64: support initrd outside kernel linear map x86: use generic early mem copy arch/arm64/kernel/setup.c | 62 +++++++++++++++++++++++++++++++++++++ arch/x86/kernel/setup.c | 22 +------------ include/asm-generic/early_ioremap.h | 6 ++++ mm/early_ioremap.c | 22 +++++++++++++ 4 files changed, 91 insertions(+), 21 deletions(-) -- 2.4.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:51318 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755554AbbHQRBR (ORCPT ); Mon, 17 Aug 2015 13:01:17 -0400 From: Mark Salter Subject: [PATCH V4 0/3] mm: Add generic copy from early unmapped RAM Date: Mon, 17 Aug 2015 13:01:04 -0400 Message-ID: <1439830867-14935-1-git-send-email-msalter@redhat.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Catalin Marinas , Will Deacon , x86@kernel.org Cc: Andrew Morton , Arnd Bergmann , Ard Biesheuvel , Mark Rutland , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Mark Salter Message-ID: <20150817170104.2MLTOq7LFllgjgCKGnOYwTafuGmnDObgroB6cC783ys@z> When booting an arm64 kernel w/initrd using UEFI/grub, use of mem= will likely cut off part or all of the initrd. This leaves it outside the kernel linear map which leads to failure when unpacking. The x86 code has a similar need to relocate an initrd outside of mapped memory in some cases. The current x86 code uses early_memremap() to copy the original initrd from unmapped to mapped RAM. This patchset creates a generic copy_from_early_mem() utility based on that x86 code and has arm64 and x86 share it in their respective initrd relocation code. Changes from V3: * Fixed arm64 build error with !CONFIG_BLK_DEV_INITRD case * Fixed nonsensical comment in arm64 relocate_initrd() Changes from V2: * Fixed sparse warning in copy_from_early_mem() * Removed unneeded MAX_MAP_CHUNK from x86 setup.c * Moved #ifdef outside arm64 relocate_initrd() definition. Changes from V1: * Change cover letter subject to highlight the added generic code * Add patch for x86 to use common copy_from_early_mem() Mark Salter (3): mm: add utility for early copy from unmapped ram arm64: support initrd outside kernel linear map x86: use generic early mem copy arch/arm64/kernel/setup.c | 62 +++++++++++++++++++++++++++++++++++++ arch/x86/kernel/setup.c | 22 +------------ include/asm-generic/early_ioremap.h | 6 ++++ mm/early_ioremap.c | 22 +++++++++++++ 4 files changed, 91 insertions(+), 21 deletions(-) -- 2.4.3