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Date: Thu, 18 Jan 2018 09:20:01 +0800 From: Chao Fan <fanc.fnst@...fujitsu.com> To: Baoquan He <bhe@...hat.com> CC: <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <hpa@...or.com>, <tglx@...utronix.de>, <mingo@...hat.com>, <keescook@...omium.org>, <yasu.isimatu@...il.com>, <indou.takao@...fujitsu.com>, <lcapitulino@...hat.com> Subject: Re: [PATCH v7 3/5] x86/KASLR: Give a warning if movable_node specified without kaslr_mem= On Wed, Jan 17, 2018 at 10:02:48PM +0800, Baoquan He wrote: >On 01/17/18 at 06:53pm, Chao Fan wrote: >> Since only 'movable_node' specified without 'kaslr_mem=' may break >> memory hotplug, so reconmmend users using 'kaslr_mem=' when >> 'movable_node' specified.. >> >> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com> >> --- >> arch/x86/boot/compressed/kaslr.c | 10 ++++++++++ >> 1 file changed, 10 insertions(+) >> >> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c >> index b200a7ceafc1..dca846b522fc 100644 >> --- a/arch/x86/boot/compressed/kaslr.c >> +++ b/arch/x86/boot/compressed/kaslr.c >> @@ -282,6 +282,16 @@ static int handle_mem_filter(void) >> !strstr(args, "kaslr_mem=")) >> return 0; >> >> +#ifdef CONFIG_MEMORY_HOTPLUG >> + /* >> + * Check if "kaslr_mem=" specified when "movable_node" found. If not, >> + * just give warrning. Otherwise memory hotplug could be >> + * affected if kernel put on movable memory regions. >> + */ >> + if (strstr(args, "movable_node") && !strstr(args, "kaslr_mem=")) >> + warn("kaslr_mem= should specified when using movable_node.\n"); > 'kaslr_mem=' ^be You have given me a large help for my poor English. Thanks, Chao Fan >> +#endif >> + >> tmp_cmdline = malloc(len + 1); >> if (!tmp_cmdline) >> error("Failed to allocate space for tmp_cmdline"); >> -- >> 2.14.3 >> >> >> > >
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