From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751022AbeDGE3E (ORCPT ); Sat, 7 Apr 2018 00:29:04 -0400 Received: from mail-ua0-f195.google.com ([209.85.217.195]:37894 "EHLO mail-ua0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750807AbeDGE3D (ORCPT ); Sat, 7 Apr 2018 00:29:03 -0400 X-Google-Smtp-Source: AIpwx4/dwtrLKdebxxDr8zRk1pDTc5QqVk8z7NBfI9ez7X87TdecbOkjr0bNDdAj7Or4bc2W+HvF23En/xeYU8VxHmg= MIME-Version: 1.0 In-Reply-To: References: <1522990390-30804-1-git-send-email-chandan.vn@samsung.com> From: Chandan Vn Date: Sat, 7 Apr 2018 09:58:21 +0530 Message-ID: Subject: Re: [PATCH 1/1] arm64: To remove initrd reserved area entry from memblock To: Laura Abbott Cc: CHANDAN VN , catalin.marinas@arm.com, will.deacon@arm.com, takahiro.akashi@linaro.org, james.morse@arm.com, robin.murphy@arm.com, steve.capper@arm.com, kristina.martsenko@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, cpgs@samsung.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 6, 2018 at 9:47 PM, Laura Abbott wrote: > Does this have an impact on anything besides accounting > in memblock? Yes, the impact is only on accounting or debugging. We were trying to reduce the reserved memory by removing initrd reserved area. After disabling "keepinitrd", only way to check if it was removed or not was to check /sys/kernel/debug/memblock/reserved. We found the entry to be present irrespective of "keepinitrd" being enabled/disabled. I hope that with the fix others wont face similar issue. Also we did not find any such problem with ARM32 ARCHITECTURE. On Fri, Apr 6, 2018 at 9:47 PM, Laura Abbott wrote: > On 04/05/2018 09:53 PM, CHANDAN VN wrote: >> >> INITRD reserved area entry is not removed from memblock >> even though initrd reserved area is freed. After freeing >> the memory it is released from memblock. The same can be >> checked from /sys/kernel/debug/memblock/reserved. >> >> The patch makes sure that the initrd entry is removed from >> memblock when keepinitrd is not enabled. >> > > Does this have an impact on anything besides accounting > in memblock? > > >> Signed-off-by: CHANDAN VN >> --- >> arch/arm64/mm/init.c | 4 +++- >> 1 file changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c >> index 9f3c47a..1b18b47 100644 >> --- a/arch/arm64/mm/init.c >> +++ b/arch/arm64/mm/init.c >> @@ -646,8 +646,10 @@ void free_initmem(void) >> void __init free_initrd_mem(unsigned long start, unsigned long end) >> { >> - if (!keep_initrd) >> + if (!keep_initrd) { >> free_reserved_area((void *)start, (void *)end, 0, >> "initrd"); >> + memblock_free(__virt_to_phys(start), end - start); >> + } >> } >> static int __init keepinitrd_setup(char *__unused) >> >