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-rw-r--r--Documentation/printk-formats.txt32
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.