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Date:   Sun, 24 May 2020 22:44:37 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Syed Nayyar Waris <syednwaris@...il.com>, linus.walleij@...aro.org,
        akpm@...ux-foundation.org
Cc:     kbuild-all@...ts.01.org, andriy.shevchenko@...ux.intel.com,
        vilhelm.gray@...il.com, arnd@...db.de, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/4] bitops: Introduce the the for_each_set_clump macro

Hi Syed,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on b9bbe6ed63b2b9f2c9ee5cbd0f2c946a2723f4ce]

url:    https://github.com/0day-ci/linux/commits/Syed-Nayyar-Waris/Introduce-the-for_each_set_clump-macro/20200524-130931
base:    b9bbe6ed63b2b9f2c9ee5cbd0f2c946a2723f4ce
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

In file included from include/asm-generic/atomic-instrumented.h:20:0,
from arch/x86/include/asm/atomic.h:265,
from include/linux/atomic.h:7,
from include/linux/crypto.h:15,
from arch/x86/kernel/asm-offsets.c:9:
include/linux/bitmap.h: In function 'bitmap_get_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bitmap.h: In function 'bitmap_set_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
--
In file included from include/linux/bits.h:23:0,
from include/linux/bitops.h:5,
from include/linux/kernel.h:12,
from include/asm-generic/bug.h:19,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/gfp.h:5,
from arch/x86/mm/init.c:1:
include/linux/bitmap.h: In function 'bitmap_get_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bitmap.h: In function 'bitmap_set_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
arch/x86/mm/init.c: At top level:
arch/x86/mm/init.c:469:21: warning: no previous prototype for 'init_memory_mapping' [-Wmissing-prototypes]
unsigned long __ref init_memory_mapping(unsigned long start,
^~~~~~~~~~~~~~~~~~~
arch/x86/mm/init.c:711:13: warning: no previous prototype for 'poking_init' [-Wmissing-prototypes]
void __init poking_init(void)
^~~~~~~~~~~
arch/x86/mm/init.c:860:13: warning: no previous prototype for 'mem_encrypt_free_decrypted_mem' [-Wmissing-prototypes]
void __weak mem_encrypt_free_decrypted_mem(void) { }
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/bits.h:23:0,
from include/linux/bitops.h:5,
from include/linux/kernel.h:12,
from include/asm-generic/bug.h:19,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/mm.h:9,
from include/linux/memblock.h:13,
from arch/x86/mm/ioremap.c:10:
include/linux/bitmap.h: In function 'bitmap_get_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bitmap.h: In function 'bitmap_set_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
arch/x86/mm/ioremap.c: At top level:
arch/x86/mm/ioremap.c:484:12: warning: no previous prototype for 'arch_ioremap_p4d_supported' [-Wmissing-prototypes]
int __init arch_ioremap_p4d_supported(void)
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/ioremap.c:489:12: warning: no previous prototype for 'arch_ioremap_pud_supported' [-Wmissing-prototypes]
int __init arch_ioremap_pud_supported(void)
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/ioremap.c:498:12: warning: no previous prototype for 'arch_ioremap_pmd_supported' [-Wmissing-prototypes]
int __init arch_ioremap_pmd_supported(void)
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/ioremap.c:737:17: warning: no previous prototype for 'early_memremap_pgprot_adjust' [-Wmissing-prototypes]
pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/bits.h:23:0,
from include/linux/bitops.h:5,
from include/linux/kernel.h:12,
from arch/x86/include/asm/percpu.h:45,
from arch/x86/include/asm/current.h:6,
from include/linux/sched.h:12,
from include/linux/uaccess.h:5,
from arch/x86/mm/extable.c:3:
include/linux/bitmap.h: In function 'bitmap_get_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bitmap.h: In function 'bitmap_set_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
arch/x86/mm/extable.c: At top level:
arch/x86/mm/extable.c:26:16: warning: no previous prototype for 'ex_handler_default' [-Wmissing-prototypes]
__visible bool ex_handler_default(const struct exception_table_entry *fixup,
^~~~~~~~~~~~~~~~~~
arch/x86/mm/extable.c:36:16: warning: no previous prototype for 'ex_handler_fault' [-Wmissing-prototypes]
__visible bool ex_handler_fault(const struct exception_table_entry *fixup,
^~~~~~~~~~~~~~~~
arch/x86/mm/extable.c:57:16: warning: no previous prototype for 'ex_handler_fprestore' [-Wmissing-prototypes]
__visible bool ex_handler_fprestore(const struct exception_table_entry *fixup,
^~~~~~~~~~~~~~~~~~~~
arch/x86/mm/extable.c:72:16: warning: no previous prototype for 'ex_handler_uaccess' [-Wmissing-prototypes]
__visible bool ex_handler_uaccess(const struct exception_table_entry *fixup,
^~~~~~~~~~~~~~~~~~
arch/x86/mm/extable.c:83:16: warning: no previous prototype for 'ex_handler_rdmsr_unsafe' [-Wmissing-prototypes]
__visible bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup,
^~~~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/extable.c:100:16: warning: no previous prototype for 'ex_handler_wrmsr_unsafe' [-Wmissing-prototypes]
__visible bool ex_handler_wrmsr_unsafe(const struct exception_table_entry *fixup,
^~~~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/extable.c:116:16: warning: no previous prototype for 'ex_handler_clear_fs' [-Wmissing-prototypes]
__visible bool ex_handler_clear_fs(const struct exception_table_entry *fixup,
^~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/bits.h:23:0,
from include/linux/bitops.h:5,
from include/linux/kernel.h:12,
from include/asm-generic/bug.h:19,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/mm.h:9,
from arch/x86/mm/mmap.c:15:
include/linux/bitmap.h: In function 'bitmap_get_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
>> include/linux/bitmap.h:590:35: note: in expansion of macro 'GENMASK'
return (map[index] >> offset) & GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bitmap.h: In function 'bitmap_set_value':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
__builtin_constant_p((l) > (h)), (l) > (h), 0)))
^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
^~~~~~~~~~~~~~~~~~~
include/linux/bitmap.h:630:11: note: in expansion of macro 'GENMASK'
value &= GENMASK(nbits - 1, 0);
^~~~~~~
arch/x86/mm/mmap.c: At top level:
arch/x86/mm/mmap.c:75:15: warning: no previous prototype for 'arch_mmap_rnd' [-Wmissing-prototypes]
unsigned long arch_mmap_rnd(void)
^~~~~~~~~~~~~
arch/x86/mm/mmap.c:216:5: warning: no previous prototype for 'valid_phys_addr_range' [-Wmissing-prototypes]
int valid_phys_addr_range(phys_addr_t addr, size_t count)
^~~~~~~~~~~~~~~~~~~~~
arch/x86/mm/mmap.c:222:5: warning: no previous prototype for 'valid_mmap_phys_addr_range' [-Wmissing-prototypes]
int valid_mmap_phys_addr_range(unsigned long pfn, size_t count)
^~~~~~~~~~~~~~~~~~~~~~~~~~
..

vim +/GENMASK +590 include/linux/bitmap.h

   569	
   570	/**
   571	 * bitmap_get_value - get a value of n-bits from the memory region
   572	 * @map: address to the bitmap memory region
   573	 * @start: bit offset of the n-bit value
   574	 * @nbits: size of value in bits
   575	 *
   576	 * Returns value of nbits located at the @start bit offset within the @map
   577	 * memory region.
   578	 */
   579	static inline unsigned long bitmap_get_value(const unsigned long *map,
   580						      unsigned long start,
   581						      unsigned long nbits)
   582	{
   583		const size_t index = BIT_WORD(start);
   584		const unsigned long offset = start % BITS_PER_LONG;
   585		const unsigned long ceiling = roundup(start + 1, BITS_PER_LONG);
   586		const unsigned long space = ceiling - start;
   587		unsigned long value_low, value_high;
   588	
   589		if (space >= nbits)
 > 590			return (map[index] >> offset) & GENMASK(nbits - 1, 0);
   591		else {
   592			value_low = map[index] & BITMAP_FIRST_WORD_MASK(start);
   593			value_high = map[index + 1] & BITMAP_LAST_WORD_MASK(start + nbits);
   594			return (value_low >> offset) | (value_high << space);
   595		}
   596	}
   597	

---
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https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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