6.6-stable review patch. If anyone has any objections, please let me know.
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From: Andy Shevchenko andriy.shevchenko@linux.intel.com
commit 188cb385bbf04d486df3e52f28c47b3961f5f0c0 upstream.
When pmd_to_hmm_pfn_flags() is unused, it prevents kernel builds with clang, `make W=1` and CONFIG_TRANSPARENT_HUGEPAGE=n:
mm/hmm.c:186:29: warning: unused function 'pmd_to_hmm_pfn_flags' [-Wunused-function]
Fix this by moving the function to the respective existing ifdeffery for its the only user.
See also:
6863f5643dd7 ("kbuild: allow Clang to find unused static inline functions for W=1 build")
Link: https://lkml.kernel.org/r/20250710082403.664093-1-andriy.shevchenko@linux.in... Fixes: 992de9a8b751 ("mm/hmm: allow to mirror vma of a file on a DAX backed filesystem") Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Reviewed-by: Leon Romanovsky leonro@nvidia.com Reviewed-by: Alistair Popple apopple@nvidia.com Cc: Andriy Shevchenko andriy.shevchenko@linux.intel.com Cc: Bill Wendling morbo@google.com Cc: Jerome Glisse jglisse@redhat.com Cc: Justin Stitt justinstitt@google.com Cc: Nathan Chancellor nathan@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/hmm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/hmm.c +++ b/mm/hmm.c @@ -173,6 +173,7 @@ static inline unsigned long hmm_pfn_flag return order << HMM_PFN_ORDER_SHIFT; }
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE static inline unsigned long pmd_to_hmm_pfn_flags(struct hmm_range *range, pmd_t pmd) { @@ -183,7 +184,6 @@ static inline unsigned long pmd_to_hmm_p hmm_pfn_flags_order(PMD_SHIFT - PAGE_SHIFT); }
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr, unsigned long end, unsigned long hmm_pfns[], pmd_t pmd)