diff options
Diffstat (limited to 'Documentation/printk-formats.txt')
| -rw-r--r-- | Documentation/printk-formats.txt | 32 |
1 files changed, 15 insertions, 17 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index 71438f3eb0c0..56804e40cb18 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -8,6 +8,21 @@ If variable is of Type, use printk format specifier: unsigned long long %llu or %llx size_t %zu or %zx ssize_t %zd or %zx + s32 %d or %x + u32 %u or %x + s64 %lld or %llx + u64 %llu or %llx + +If <type> is dependent on a config option for its size (e.g., sector_t, +blkcnt_t) or is architecture-dependent for its size (e.g., tcflag_t), use a +format specifier of its largest possible type and explicitly cast to it. +Example: + + printk("test: sector number/total blocks: %llu/%llu\n", + (unsigned long long)sector, (unsigned long long)blockcount); + +Reminder: sizeof() result is of type size_t. + Raw pointer value SHOULD be printed with %p. The kernel supports the following extended format specifiers for pointer types: @@ -246,23 +261,6 @@ struct va_format: Passed by reference. -u64 SHOULD be printed with %llu/%llx: - - printk("%llu", u64_var); - -s64 SHOULD be printed with %lld/%llx: - - printk("%lld", s64_var); - -If <type> is dependent on a config option for its size (e.g., sector_t, -blkcnt_t) or is architecture-dependent for its size (e.g., tcflag_t), use a -format specifier of its largest possible type and explicitly cast to it. -Example: - - printk("test: sector number/total blocks: %llu/%llu\n", - (unsigned long long)sector, (unsigned long long)blockcount); - -Reminder: sizeof() result is of type size_t. Thank you for your cooperation and attention. |