linux-kernel - [PATCH v2 1/2] kexec: Add KEXEC_FILE_NO

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Message-ID: <20250805211527.122367-2-makb@juniper.net>
Date: Tue, 5 Aug 2025 14:15:26 -0700
From: Brian Mak <makb@...iper.net>
To: Baoquan He <bhe@...hat.com>, Dave Young <dyoung@...hat.com>,
        Alexander
 Graf <graf@...zon.com>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
	<mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen
	<dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew
 Morton <akpm@...ux-foundation.org>,
        Rob Herring <robh@...nel.org>, Saravana
 Kannan <saravanak@...gle.com>,
        <x86@...nel.org>, <kexec@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Brian Mak <makb@...iper.net>
Subject: [PATCH v2 1/2] kexec: Add KEXEC_FILE_NO_CMA as a legal flag

Commit 07d24902977e ("kexec: enable CMA based contiguous allocation")
introduces logic to use CMA-based allocation in kexec by default. As
part of the changes, it introduces a kexec_file_load flag to disable the
use of CMA allocations from userspace. However, this flag is broken
since it is missing from the list of legal flags for kexec_file_load.
kexec_file_load returns EINVAL when attempting to use the flag.

Fix this by adding the KEXEC_FILE_NO_CMA flag to the list of legal flags
for kexec_file_load.

Fixes: 07d24902977e ("kexec: enable CMA based contiguous allocation")
Signed-off-by: Brian Mak <makb@...iper.net>
---
 include/linux/kexec.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 1b10a5d84b68..39fe3e6cd282 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -460,7 +460,8 @@ bool kexec_load_permitted(int kexec_image_type);
 
 /* List of defined/legal kexec file flags */
 #define KEXEC_FILE_FLAGS	(KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
-				 KEXEC_FILE_NO_INITRAMFS | KEXEC_FILE_DEBUG)
+				 KEXEC_FILE_NO_INITRAMFS | KEXEC_FILE_DEBUG | \
+				 KEXEC_FILE_NO_CMA)
 
 /* flag to track if kexec reboot is in progress */
 extern bool kexec_in_progress;
-- 
2.25.1