From: Steven Rostedt <rost...@goodmis.org> The function get_vm_area() is not defined for non-MMU builds and causes a build error if it is used. Hide the map_pages() function around a:
#ifdef CONFIG_MMU to keep it from being compiled when CONFIG_MMU is not set. Reported-by: Guenter Roeck <li...@roeck-us.net> Tested-by: Guenter Roeck <li...@roeck-us.net> Closes: https://lore.kernel.org/all/4f8ece8b-8862-4f7c-8ede-febd28f8a...@roeck-us.net/ Fixes: 394f3f02de531 ("tracing: Use vmap_page_range() to map memmap ring buffer") Signed-off-by: Steven Rostedt (Google) <rost...@goodmis.org> --- kernel/trace/trace.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index b581e388a9d9..8ddf6b17215c 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9806,6 +9806,7 @@ static int instance_mkdir(const char *name) return ret; } +#ifdef CONFIG_MMU static u64 map_pages(unsigned long start, unsigned long size) { unsigned long vmap_start, vmap_end; @@ -9828,6 +9829,12 @@ static u64 map_pages(unsigned long start, unsigned long size) return (u64)vmap_start; } +#else +static inline u64 map_pages(unsigned long start, unsigned long size) +{ + return 0; +} +#endif /** * trace_array_get_by_name - Create/Lookup a trace array, given its name. -- 2.47.2
