linux-kernel - [PATCH] mm: cma: Fix stub for cma_skip_dt_default_reserved

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Message-Id: <20260128-cma-fix-stubs-v1-1-e07a077d5b33@kernel.org>
Date: Wed, 28 Jan 2026 16:28:35 +0000
From: Mark Brown <broonie@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 David Hildenbrand <david@...nel.org>, 
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, 
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
 "Rob Herring (Arm)" <robh@...nel.org>, 
 Oreoluwa Babatunde <oreoluwa.babatunde@....qualcomm.com>, 
 Marek Szyprowski <m.szyprowski@...sung.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH] mm: cma: Fix stub for cma_skip_dt_default_reserved_mem()

The stub for cma_skip_dt_default_reserved_mem() is not inlined so
triggers build warnings:

In file included from /tmp/next/build/fs/proc/meminfo.c:18:
/tmp/next/build/include/linux/cma.h:68:13: warning: 'cma_skip_dt_default_reserved_mem' defined but not used [-Wunused-function]
   68 | static bool cma_skip_dt_default_reserved_mem(void)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

which are fatal with -Werror.

Fixes: 26332ae848f08 ("of: reserved_mem: Allow reserved_mem framework detect "cma=" kernel param")
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 include/linux/cma.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 0bf408360641..d0793eaaadaa 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -65,7 +65,7 @@ extern void cma_reserve_pages_on_error(struct cma *cma);
 #ifdef CONFIG_DMA_CMA
 extern bool cma_skip_dt_default_reserved_mem(void);
 #else
-static bool cma_skip_dt_default_reserved_mem(void)
+static inline bool cma_skip_dt_default_reserved_mem(void)
 {
 	return false;
 }

---
base-commit: d0d97f0b2b2b4633022dfaef4ac08af0b7917efe
change-id: 20260128-cma-fix-stubs-26b13ce1471d

Best regards,
--  
Mark Brown <broonie@...nel.org>