+ mm-hmm-move-pmd_to_hmm_pfn_flags-to-the-respective-ifdeffery.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/hmm: move pmd_to_hmm_pfn_flags() to the respective #ifdeffery
has been added to the -mm mm-new branch.  Its filename is
     mm-hmm-move-pmd_to_hmm_pfn_flags-to-the-respective-ifdeffery.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hmm-move-pmd_to_hmm_pfn_flags-to-the-respective-ifdeffery.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
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fixup patches in mm-new.

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------------------------------------------------------
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: mm/hmm: move pmd_to_hmm_pfn_flags() to the respective #ifdeffery
Date: Thu, 10 Jul 2025 11:23:53 +0300

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.intel.com
Fixes: 9d3973d60f0a ("mm/hmm: cleanup the hmm_vma_handle_pmd stub")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Leon Romanovsky <leonro@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>
---

 mm/hmm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/hmm.c~mm-hmm-move-pmd_to_hmm_pfn_flags-to-the-respective-ifdeffery
+++ a/mm/hmm.c
@@ -183,6 +183,7 @@ 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)
 {
@@ -193,7 +194,6 @@ 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)
_

Patches currently in -mm which might be from andriy.shevchenko@linux.intel.com are

mm-hmm-move-pmd_to_hmm_pfn_flags-to-the-respective-ifdeffery.patch
panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch