Messages in this thread | | | Date | Wed, 14 Jul 2021 18:13:18 -0400 | From | Steven Rostedt <> | Subject | Re: [GIT PULL] tracing: Add __string_len() and __assign_str_len() helpers |
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On Wed, 14 Jul 2021 17:56:33 -0400 Steven Rostedt <rostedt@goodmis.org> wrote:
> That "(len)+1" adds the extra byte for the '0'. Hence, it is similar to: > > dst = kmalloc(len + 1, GFP_KERNEL); > strncpy(dst, src, len); > dst[len] = '\0'; > > Where the requirement is that you want to save len bytes of source into > dst, where len must be at least the size of src.
Sorry, that should have read "len must be at most the size of src".
That is, the caller knows how big src is, and is telling the trace event that all characters up to "len" exists.
-- Steve
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