From: kernel test robot <lkp@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
David Hildenbrand <david@kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
mm-commits@vger.kernel.org, Davidlohr Bueso <dave@stgolabs.net>
Subject: [akpm-mm:mm-new 117/130] arch/riscv/mm/init.c:116:22: warning: implicit conversion from 'unsigned long long' to 'u32' (aka 'unsigned int') changes value from 1099511627776 to 0
Date: Thu, 30 Apr 2026 08:49:15 +0800 [thread overview]
Message-ID: <202604300817.QeXlZapz-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
head: 0587fb0c820d86e5b77a975680d79b5176d09abb
commit: 93580c23bb3da5dd2926d6ae991ef04c2cdacaf2 [117/130] include/asm-generic/fixmap.h: reimplement nasty macros in C
config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20260430/202604300817.QeXlZapz-lkp@intel.com/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260430/202604300817.QeXlZapz-lkp@intel.com/reproduce)
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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604300817.QeXlZapz-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from arch/riscv/mm/init.c:27:
In file included from arch/riscv/include/asm/fixmap.h:64:
include/asm-generic/fixmap.h:93:26: error: use of undeclared identifier 'PAGE_KERNEL_NOCACHE'
__set_fixmap(idx, phys, FIXMAP_PAGE_NOCACHE);
^
include/asm-generic/fixmap.h:54:29: note: expanded from macro 'FIXMAP_PAGE_NOCACHE'
#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
^
include/asm-generic/fixmap.h:99:33: error: use of undeclared identifier 'PAGE_KERNEL_NOCACHE'
__set_fixmap_offset(idx, phys, FIXMAP_PAGE_NOCACHE);
^
include/asm-generic/fixmap.h:54:29: note: expanded from macro 'FIXMAP_PAGE_NOCACHE'
#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NOCACHE
^
>> arch/riscv/mm/init.c:116:22: warning: implicit conversion from 'unsigned long long' to 'u32' (aka 'unsigned int') changes value from 1099511627776 to 0 [-Wconstant-conversion]
(((t) - (b)) >> LOG2_SZ_1T));
^~~~~~~~~~
include/linux/printk.h:574:36: note: expanded from macro 'pr_notice'
printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~~
include/linux/printk.h:511:60: note: expanded from macro 'printk'
#define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
^~~~~~~~~~~
include/linux/printk.h:483:19: note: expanded from macro 'printk_index_wrap'
_p_func(_fmt, ##__VA_ARGS__); \
^~~~~~~~~~~
note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/uapi/linux/const.h:20:20: note: expanded from macro '__AC'
#define __AC(X,Y) (X##Y)
^~~~
<scratch space>:6:1: note: expanded from here
0x10000000000ULL
^~~~~~~~~~~~~~~~
include/linux/log2.h:162:14: note: expanded from macro 'ilog2'
__ilog2_u32(n) : \
~~~~~~~~~~~ ^
arch/riscv/mm/init.c:126:43: warning: implicit conversion from 'unsigned long long' to 'u32' (aka 'unsigned int') changes value from 1099511627776 to 0 [-Wconstant-conversion]
if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10)
^~~~~~~~~~
arch/riscv/mm/init.c:92:27: note: expanded from macro 'LOG2_SZ_1T'
#define LOG2_SZ_1T ilog2(SZ_1T)
~~~~~~^~~~~~
include/linux/sizes.h:63:18: note: expanded from macro 'SZ_1T'
#define SZ_1T _AC(0x10000000000, ULL)
^~~~~~~~~~~~~~~~~~~~~~~
include/uapi/linux/const.h:21:18: note: expanded from macro '_AC'
#define _AC(X,Y) __AC(X,Y)
^~~~~~~~~
include/uapi/linux/const.h:20:20: note: expanded from macro '__AC'
#define __AC(X,Y) (X##Y)
^~~~
<scratch space>:11:1: note: expanded from here
0x10000000000ULL
^~~~~~~~~~~~~~~~
include/linux/log2.h:162:14: note: expanded from macro 'ilog2'
__ilog2_u32(n) : \
~~~~~~~~~~~ ^
arch/riscv/mm/init.c:245:49: warning: implicit conversion from 'unsigned long long' to 'u32' (aka 'unsigned int') changes value from 17179869184 to 0 [-Wconstant-conversion]
vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT;
^~~~~~~~~~~~~~~~~~
arch/riscv/mm/init.c:67:9: note: expanded from macro 'VMEMMAP_ADDR_ALIGN'
MAX_FOLIO_VMEMMAP_ALIGN)
^~~~~~~~~~~~~~~~~~~~~~~
include/linux/mmzone.h:108:3: note: expanded from macro 'MAX_FOLIO_VMEMMAP_ALIGN'
MAX_FOLIO_NR_PAGES * sizeof(struct page) : 0)
^~~~~~~~~~~~~~~~~~
include/linux/mmzone.h:97:36: note: expanded from macro 'MAX_FOLIO_NR_PAGES'
#define MAX_FOLIO_NR_PAGES (1UL << MAX_FOLIO_ORDER)
^~~~~~~~~~~~~~~
note: (skipping 8 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/minmax.h:92:28: note: expanded from macro '__careful_cmp_once'
auto ux = (x); auto uy = (y); \
^
include/linux/math.h:35:50: note: expanded from macro 'round_down'
#define round_down(x, y) ((x) & ~__round_mask(x, y))
^
include/linux/math.h:15:46: note: expanded from macro '__round_mask'
#define __round_mask(x, y) ((__typeof__(x))((y)-1))
^
3 warnings and 2 errors generated.
vim +116 arch/riscv/mm/init.c
26b8f69edda85a Alexandre Ghiti 2021-12-06 111
26b8f69edda85a Alexandre Ghiti 2021-12-06 112 #ifdef CONFIG_64BIT
26b8f69edda85a Alexandre Ghiti 2021-12-06 113 static inline void print_mlt(char *name, unsigned long b, unsigned long t)
26b8f69edda85a Alexandre Ghiti 2021-12-06 114 {
26b8f69edda85a Alexandre Ghiti 2021-12-06 115 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t,
26b8f69edda85a Alexandre Ghiti 2021-12-06 @116 (((t) - (b)) >> LOG2_SZ_1T));
26b8f69edda85a Alexandre Ghiti 2021-12-06 117 }
26b8f69edda85a Alexandre Ghiti 2021-12-06 118 #else
26b8f69edda85a Alexandre Ghiti 2021-12-06 119 #define print_mlt(n, b, t) do {} while (0)
26b8f69edda85a Alexandre Ghiti 2021-12-06 120 #endif
26b8f69edda85a Alexandre Ghiti 2021-12-06 121
:::::: The code at line 116 was first introduced by commit
:::::: 26b8f69edda85a7942fa580360690c2d5c74f765 riscv: Improve virtual kernel memory layout dump
:::::: TO: Alexandre Ghiti <alexandre.ghiti@canonical.com>
:::::: CC: Palmer Dabbelt <palmer@rivosinc.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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