[PATCH 6.19 049/311] iommupt/amdv1: mark amdv1pt_install_leaf_entry as __always_inline

Greg Kroah-Hartman
2026-04-08T18:51:51Z

From: Sherry Yang <sherry.yang@oracle.com>

[ Upstream commit 8b72aa5704c77380742346d4ac755b074b7f9eaa ]

After enabling CONFIG_GCOV_KERNEL and CONFIG_GCOV_PROFILE_ALL, following
build failure is observed under GCC 14.2.1:

In function 'amdv1pt_install_leaf_entry',
inlined from '__do_map_single_page' at drivers/iommu/generic_pt/fmt/../iommu_pt.h:650:3,
inlined from '__map_single_page0' at drivers/iommu/generic_pt/fmt/../iommu_pt.h:661:1,
inlined from 'pt_descend' at drivers/iommu/generic_pt/fmt/../pt_iter.h:391:9,
inlined from '__do_map_single_page' at drivers/iommu/generic_pt/fmt/../iommu_pt.h:657:10,
inlined from '__map_single_page1.constprop' at drivers/iommu/generic_pt/fmt/../iommu_pt.h:661:1:
././include/linux/compiler_types.h:706:45: error: call to '__compiletime_assert_71' declared with attribute error: FIELD_PREP: value too large for the field
706 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
|

......

drivers/iommu/generic_pt/fmt/amdv1.h:220:26: note: in expansion of macro 'FIELD_PREP'
220 | FIELD_PREP(AMDV1PT_FMT_OA,
| ^~~~~~~~~~

In the path '__do_map_single_page()', level 0 always invokes
'pt_install_leaf_entry(&pts, map->oa, PAGE_SHIFT, …)'. At runtime that
lands in the 'if (oasz_lg2 == isz_lg2)' arm of 'amdv1pt_install_leaf_entry()';
the contiguous-only 'else' block is unreachable for 4 KiB pages.

With CONFIG_GCOV_KERNEL + CONFIG_GCOV_PROFILE_ALL, the extra
instrumentation changes GCC's inlining so that the "dead" 'else' branch
still gets instantiated. The compiler constant-folds the contiguous OA
expression, runs the 'FIELD_PREP()' compile-time check, and produces:

FIELD_PREP: value too large for the field

gcov-enabled builds therefore fail even though the code path never executes.

Fix this by marking amdv1pt_install_leaf_entry as __always_inline.

Fixes: dcd6a011a8d5 ("iommupt: Add map_pages op")
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sherry Yang <sherry.yang@oracle.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/generic_pt/fmt/amdv1.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/generic_pt/fmt/amdv1.h b/drivers/iommu/generic_pt/fmt/amdv1.h
index 3b2c41d9654d7..8d11b08291d73 100644
--- a/drivers/iommu/generic_pt/fmt/amdv1.h
+++ b/drivers/iommu/generic_pt/fmt/amdv1.h
@@ -191,7 +191,7 @@ static inline enum pt_entry_type amdv1pt_load_entry_raw(struct pt_state *pts)
}
#define pt_load_entry_raw amdv1pt_load_entry_raw

-static inline void
+static __always_inline void
amdv1pt_install_leaf_entry(struct pt_state *pts, pt_oaddr_t oa,
unsigned int oasz_lg2,
const struct pt_write_attrs *attrs)
--
2.53.0