linux-kernel - Re: [PATCH] x86/efi: Do not release sub-1MB memory regions when the crashkernel option is specified

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Date:   Mon, 12 Apr 2021 09:13:47 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     Lianbo Jiang <lijiang@...hat.com>, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        x86@...nel.org, ardb@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dvhart@...radead.org,
        andy@...radead.org, kexec@...ts.infradead.org, dyoung@...hat.com
Subject: Re: [PATCH] x86/efi: Do not release sub-1MB memory regions when the
 crashkernel option is specified

On 04/09/21 at 07:59pm, H. Peter Anvin wrote:
> Why don't we do this unconditionally? At the very best we gain half a megabyte of memory (except the trampoline, which has to live there, but it is only a few kilobytes.)

This is a great suggestion, thanks. I think we can fix it in this way to
make code simpler. Then the specific caring of real mode in
efi_free_boot_services() can be removed too.

Thanks
Baoquan