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Steven Rostedt (VMware)
1b20d9491c
In order to move pointer checks like IS_ERR_VALUE() out of the hotpath and into the reader path of a trace event, user space tools need to be able to parse that. IS_ERR_VALUE() is defined as: #define IS_ERR_VALUE() unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) Which eventually turns into: __builtin_expect(!!((unsigned long)(void *)(x) >= (unsigned long)-4095), 0) Now the traceevent parser can handle most of that except for the __builtin_expect(), which needs to be added. Link: https://lore.kernel.org/linux-mm/[email protected]/ Signed-off-by: Steven Rostedt (VMware) <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Jaewon Kim <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Kees Kook <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>