diff options
Diffstat (limited to 'Documentation/printk-formats.txt')
| -rw-r--r-- | Documentation/printk-formats.txt | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index 3e8cb73ac43..b4498218c47 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -55,14 +55,21 @@ Struct Resources: For printing struct resources. The 'R' and 'r' specifiers result in a printed resource with ('R') or without ('r') a decoded flags member. -Physical addresses: +Physical addresses types phys_addr_t: - %pa 0x01234567 or 0x0123456789abcdef + %pa[p] 0x01234567 or 0x0123456789abcdef For printing a phys_addr_t type (and its derivatives, such as resource_size_t) which can vary based on build options, regardless of the width of the CPU data path. Passed by reference. +DMA addresses types dma_addr_t: + + %pad 0x01234567 or 0x0123456789abcdef + + For printing a dma_addr_t type which can vary based on build options, + regardless of the width of the CPU data path. Passed by reference. + Raw buffer as a hex string: %*ph 00 01 02 ... 3f %*phC 00:01:02: ... :3f @@ -97,7 +104,7 @@ IPv4 addresses: %pI4 1.2.3.4 %pi4 001.002.003.004 - %p[Ii][hnbl] + %p[Ii]4[hnbl] For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4' specifiers result in a printed address with ('i4') or without ('I4') @@ -168,6 +175,15 @@ UUID/GUID addresses: Where no additional specifiers are used the default little endian order with lower case hex characters will be printed. +dentry names: + %pd{,2,3,4} + %pD{,2,3,4} + + For printing dentry name; if we race with d_move(), the name might be + a mix of old and new ones, but it won't oops. %pd dentry is a safer + equivalent of %s dentry->d_name.name we used to use, %pd<n> prints + n last components. %pD does the same thing for struct file. + struct va_format: %pV @@ -183,13 +199,13 @@ struct va_format: Do not use this feature without some mechanism to verify the correctness of the format string and va_list arguments. -u64 SHOULD be printed with %llu/%llx, (unsigned long long): +u64 SHOULD be printed with %llu/%llx: - printk("%llu", (unsigned long long)u64_var); + printk("%llu", u64_var); -s64 SHOULD be printed with %lld/%llx, (long long): +s64 SHOULD be printed with %lld/%llx: - printk("%lld", (long long)s64_var); + 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 |