tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1If variable is of Type, use printk format specifier:
2---------------------------------------------------------
3 int %d or %x
4 unsigned int %u or %x
5 long %ld or %lx
6 unsigned long %lu or %lx
7 long long %lld or %llx
8 unsigned long long %llu or %llx
9 size_t %zu or %zx
10 ssize_t %zd or %zx
11
12Raw pointer value SHOULD be printed with %p.
13
14u64 SHOULD be printed with %llu/%llx, (unsigned long long):
15
16 printk("%llu", (unsigned long long)u64_var);
17
18s64 SHOULD be printed with %lld/%llx, (long long):
19
20 printk("%lld", (long long)s64_var);
21
22If <type> is dependent on a config option for its size (e.g., sector_t,
23blkcnt_t, phys_addr_t, resource_size_t) or is architecture-dependent
24for its size (e.g., tcflag_t), use a format specifier of its largest
25possible type and explicitly cast to it. Example:
26
27 printk("test: sector number/total blocks: %llu/%llu\n",
28 (unsigned long long)sector, (unsigned long long)blockcount);
29
30Reminder: sizeof() result is of type size_t.
31
32Thank you for your cooperation and attention.
33
34
35By Randy Dunlap <rdunlap@xenotime.net>