linux-kernel - Re: [PATCH] kexec: Enable CMA based contiguous allocation

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Message-ID: <0fac5973d5588ee441ae95384d2edda69989ac10.camel@infradead.org>
Date: Sat, 24 May 2025 11:16:03 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: Alexander Graf <graf@...zon.com>, kexec@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
  Baoquan He <bhe@...hat.com>, Pasha Tatashin <pasha.tatashin@...een.com>,
 nh-open-source@...zon.com
Subject: Re: [PATCH] kexec: Enable CMA based contiguous allocation

On Mon, 2025-05-12 at 22:57 +0000, Alexander Graf wrote:
> 
> --- a/include/uapi/linux/kexec.h
> +++ b/include/uapi/linux/kexec.h
> @@ -27,6 +27,7 @@
>  #define KEXEC_FILE_ON_CRASH	0x00000002
>  #define KEXEC_FILE_NO_INITRAMFS	0x00000004
>  #define KEXEC_FILE_DEBUG	0x00000008
> +#define KEXEC_FILE_NO_CMA	0x00000010
>  

Gives me EINVAL when I try to use it. This helps (but should it be
permitted only on architectures which implement it?):

--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -385,7 +385,7 @@ extern int kexec_load_disabled;
 /* List of defined/legal kexec file flags */
 #define KEXEC_FILE_FLAGS       (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
                                 KEXEC_FILE_NO_INITRAMFS | \
-                                KEXEC_FILE_COOPERATIVE)
+                                KEXEC_FILE_COOPERATIVE | KEXEC_FILE_NO_CMA)
 
 /* Location of a reserved region to hold the crash kernel.
  */


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