Re: [PATCH v7 1/4] bitops: Introduce the the for_each_set_clump macro

Syed Nayyar Waris
2020-05-29T18:08:38Z

On Sun, May 24, 2020 at 8:15 PM kbuild test robot <lkp@intel.com> wrote:
>
> 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@intel.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
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Hi William, Andy and All,

Regarding the above compilation warnings. All the warnings are because
of GENMASK usage in my patch.
The warnings are coming because of sanity checks present for 'GENMASK'
macro in include/linux/bits.h.

Taking the example statement (in my patch) where compilation warning
is getting reported:
return (map[index] >> offset) & GENMASK(nbits - 1, 0);

'nbits' is of type 'unsigned long'.
In above, the sanity check is comparing '0' with unsigned value. And
unsigned value can't be less than '0' ever, hence the warning.
But this warning will occur whenever there will be '0' as one of the
'argument' and an unsigned variable as another 'argument' for GENMASK.

This warning is getting cleared if I cast the 'nbits' to 'long'.

Let me know if I should submit a next patch with the casts applied.
What do you guys think?

Regards
Syed Nayyar Waris