linux-kernel - [PATCH 2/2] [RFC] iommu: io-pgtable-arm-v7s: avoid gcc-16.0.1 section mismatch

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Message-Id: <20260203162406.2215716-2-arnd@kernel.org>
Date: Tue,  3 Feb 2026 17:24:00 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 2/2] [RFC] iommu: io-pgtable-arm-v7s: avoid gcc-16.0.1 section mismatch

From: Arnd Bergmann <arnd@...db.de>

gcc-16 has gained some more advanced inlining techniques that enable
it to inline the dummy_tlb_add_page() and dummy_tlb_flush() function
pointers into a specialized version of __arm_v7s_unmap:

WARNING: modpost: vmlinux: section mismatch in reference: __arm_v7s_unmap+0x2cc (section: .text) -> dummy_tlb_add_page (section: .init.text)

>From what I can tell, the transformation is correct, as this
is only called when __arm_v7s_unmap() is called from
arm_v7s_do_selftests(), which is also __init.

I have not come up with a good workaround, so this simply marks
dummy_tlb_add_page() as not __init. Since there are currently only two
files where this happens, that may be an easy way out.

If anyone has a better idea for how to deal with that, let me know!

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/iommu/io-pgtable-arm-v7s.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
index 523355e91a2c..705885924afb 100644
--- a/drivers/iommu/io-pgtable-arm-v7s.c
+++ b/drivers/iommu/io-pgtable-arm-v7s.c
@@ -775,23 +775,23 @@ struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns = {
 
 #ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
 
-static struct io_pgtable_cfg *cfg_cookie __initdata;
+static struct io_pgtable_cfg *cfg_cookie;
 
 static void __init dummy_tlb_flush_all(void *cookie)
 {
 	WARN_ON(cookie != cfg_cookie);
 }
 
-static void __init dummy_tlb_flush(unsigned long iova, size_t size,
+static void dummy_tlb_flush(unsigned long iova, size_t size,
 				   size_t granule, void *cookie)
 {
 	WARN_ON(cookie != cfg_cookie);
 	WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
 }
 
-static void __init dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
-				      unsigned long iova, size_t granule,
-				      void *cookie)
+static void dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
+			       unsigned long iova, size_t granule,
+			       void *cookie)
 {
 	dummy_tlb_flush(iova, granule, granule, cookie);
 }
-- 
2.39.5