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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2021-07-17 03:55:10 +0300
committerChuck Lever <chuck.lever@oracle.com>2021-08-17 18:47:52 +0300
commit883b4aee4dec64bc807a7dda4651c6a5efe9a74d (patch)
tree63f49ec8f535ab4ca9a8d31a65317b23240a2ebe /Kconfig
parent496d83cf0f2fa70cfe256c2499e2d3523d3868f3 (diff)
downloadlinux-883b4aee4dec64bc807a7dda4651c6a5efe9a74d.tar.xz
tracing: Add trace_event helper macros __string_len() and __assign_str_len()
There's a few cases that a string that is to be recorded in a trace event, does not have a terminating 'nul' character, and instead, the tracepoint passes in the length of the string to record. Add two helper macros to the trace event code that lets this work easier, than tricks with "%.*s" logic. __string_len() which is similar to __string() for declaration, but takes a length argument. __assign_str_len() which is similar to __assign_str() for assiging the string, but it too takes a length argument. Note, the TRACE_EVENT() macro will allocate the location on the ring buffer to 'len + 1', that will be used to store the string into. It is a requirement that the 'len' used for this is a most the length of the string being recorded. This string can still use __get_str() just like strings created with __string() can use to retrieve the string. Link: https://lore.kernel.org/linux-nfs/20210513105018.7539996a@gandalf.local.home/ Tested-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'Kconfig')
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