Re: [PATCH 1/2] highmem: Add memcpy_to_folio()

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Hi Matthew,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.4-rc6]
[cannot apply to next-20230614]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Matthew-Wilcox-Oracle/highmem-Add-memcpy_from_folio/20230614-215150
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230614134853.1521439-1-willy%40infradead.org
patch subject: [PATCH 1/2] highmem: Add memcpy_to_folio()
config: arm-randconfig-r046-20230614 (https://download.01.org/0day-ci/archive/20230615/202306150314.BSvTy8oJ-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build):
        mkdir -p ~/bin
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch akpm-mm mm-everything
        git checkout akpm-mm/mm-everything
        b4 shazam https://lore.kernel.org/r/20230614134853.1521439-1-willy@xxxxxxxxxxxxx
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/light/

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306150314.BSvTy8oJ-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from drivers/iio/light/rohm-bu27034.c:12:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:525:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12) - ((unsigned long)(offset) & ~(~((1 << 12) - 1)))) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     525 |                 n = min(len, PAGE_SIZE - offset_in_page(offset));
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   In file included from drivers/iio/light/rohm-bu27034.c:12:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:534:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     534 |                 n = min(len, PAGE_SIZE);
         |                     ^~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   2 warnings generated.
--
   In file included from drivers/iio/light/pa12203001.c:14:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:525:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12) - ((unsigned long)(offset) & ~(~((1 << 12) - 1)))) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     525 |                 n = min(len, PAGE_SIZE - offset_in_page(offset));
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   In file included from drivers/iio/light/pa12203001.c:14:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:534:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     534 |                 n = min(len, PAGE_SIZE);
         |                     ^~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   drivers/iio/light/pa12203001.c:457:36: warning: unused variable 'pa12203001_acpi_match' [-Wunused-const-variable]
     457 | static const struct acpi_device_id pa12203001_acpi_match[] = {
         |                                    ^
   3 warnings generated.
--
   In file included from drivers/iio/light/rpr0521.c:14:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:525:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12) - ((unsigned long)(offset) & ~(~((1 << 12) - 1)))) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     525 |                 n = min(len, PAGE_SIZE - offset_in_page(offset));
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   In file included from drivers/iio/light/rpr0521.c:14:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:534:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     534 |                 n = min(len, PAGE_SIZE);
         |                     ^~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   drivers/iio/light/rpr0521.c:1105:36: warning: unused variable 'rpr0521_acpi_match' [-Wunused-const-variable]
    1105 | static const struct acpi_device_id rpr0521_acpi_match[] = {
         |                                    ^
   3 warnings generated.
--
   In file included from drivers/iio/light/stk3310.c:11:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:525:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12) - ((unsigned long)(offset) & ~(~((1 << 12) - 1)))) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     525 |                 n = min(len, PAGE_SIZE - offset_in_page(offset));
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   In file included from drivers/iio/light/stk3310.c:11:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:534:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     534 |                 n = min(len, PAGE_SIZE);
         |                     ^~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   drivers/iio/light/stk3310.c:693:36: warning: unused variable 'stk3310_acpi_id' [-Wunused-const-variable]
     693 | static const struct acpi_device_id stk3310_acpi_id[] = {
         |                                    ^
   3 warnings generated.
--
   In file included from drivers/iio/light/us5182d.c:14:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:525:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12) - ((unsigned long)(offset) & ~(~((1 << 12) - 1)))) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     525 |                 n = min(len, PAGE_SIZE - offset_in_page(offset));
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   In file included from drivers/iio/light/us5182d.c:14:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:534:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     534 |                 n = min(len, PAGE_SIZE);
         |                     ^~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   drivers/iio/light/us5182d.c:950:36: warning: unused variable 'us5182d_acpi_match' [-Wunused-const-variable]
     950 | static const struct acpi_device_id us5182d_acpi_match[] = {
         |                                    ^
   3 warnings generated.
--
   In file included from drivers/iio/light/ltr501.c:13:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:525:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12) - ((unsigned long)(offset) & ~(~((1 << 12) - 1)))) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     525 |                 n = min(len, PAGE_SIZE - offset_in_page(offset));
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   In file included from drivers/iio/light/ltr501.c:13:
   In file included from include/linux/i2c.h:19:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:22:
   In file included from include/linux/writeback.h:13:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
>> include/linux/highmem.h:534:7: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
     534 |                 n = min(len, PAGE_SIZE);
         |                     ^~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:67:19: note: expanded from macro 'min'
      67 | #define min(x, y)       __careful_cmp(x, y, <)
         |                         ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
      36 |         __builtin_choose_expr(__safe_cmp(x, y), \
         |                               ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
      26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
         |                  ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
      20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
         |                    ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   drivers/iio/light/ltr501.c:1611:36: warning: unused variable 'ltr_acpi_match' [-Wunused-const-variable]
    1611 | static const struct acpi_device_id ltr_acpi_match[] = {
         |                                    ^
   3 warnings generated.
..


vim +525 include/linux/highmem.h

   509	
   510	/**
   511	 * memcpy_to_folio - Copy a range of bytes to a folio
   512	 * @folio: The folio to write to.
   513	 * @offset: The first byte in the folio to store to.
   514	 * @from: The memory to copy from.
   515	 * @len: The number of bytes to copy.
   516	 */
   517	static inline void memcpy_to_folio(struct folio *folio, size_t offset,
   518			const char *from, size_t len)
   519	{
   520		size_t n = len;
   521	
   522		VM_BUG_ON(offset + len > folio_size(folio));
   523	
   524		if (folio_test_highmem(folio))
 > 525			n = min(len, PAGE_SIZE - offset_in_page(offset));
   526		for (;;) {
   527			char *to = kmap_local_folio(folio, offset);
   528			memcpy(to, from, n);
   529			kunmap_local(to);
   530			if (!folio_test_highmem(folio) || n == len)
   531				break;
   532			offset += n;
   533			len -= n;
 > 534			n = min(len, PAGE_SIZE);
   535		}
   536		flush_dcache_folio(folio);
   537	}
   538	

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