b67ad18b06
Add printk-formats.txt so that we don't have to keep fixing the same things over and over again. <wishful thinking> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
36 lines
1.0 KiB
Plaintext
36 lines
1.0 KiB
Plaintext
If variable is of Type, use printk format specifier:
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---------------------------------------------------------
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int %d or %x
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unsigned int %u or %x
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long %ld or %lx
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unsigned long %lu or %lx
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long long %lld or %llx
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unsigned long long %llu or %llx
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size_t %zu or %zx
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ssize_t %zd or %zx
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Raw pointer value SHOULD be printed with %p.
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u64 SHOULD be printed with %llu/%llx, (unsigned long long):
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printk("%llu", (unsigned long long)u64_var);
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s64 SHOULD be printed with %lld/%llx, (long long):
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printk("%lld", (long long)s64_var);
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If <type> is dependent on a config option for its size (e.g., sector_t,
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blkcnt_t, phys_addr_t, resource_size_t) or is architecture-dependent
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for its size (e.g., tcflag_t), use a format specifier of its largest
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possible type and explicitly cast to it. Example:
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printk("test: sector number/total blocks: %llu/%llu\n",
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(unsigned long long)sector, (unsigned long long)blockcount);
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Reminder: sizeof() result is of type size_t.
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Thank you for your cooperation and attention.
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By Randy Dunlap <rdunlap@xenotime.net>
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