Without DEBUG_FS, all the code in gup_benchmark becomes meaningless. For sure kernel provides debugfs stub while DEBUG_FS is disabled, but the point here is that GUP_BENCHMARK can do nothing without DEBUG_FS. Cc: John Hubbard <jhubbard@xxxxxxxxxx> Cc: Ralph Campbell <rcampbell@xxxxxxxxxx> Inspired-by: John Garry <john.garry@xxxxxxxxxx> Signed-off-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx> --- * inspired by John's comment in this patch: https://lore.kernel.org/linux-iommu/184797b8-512e-e3da-fae7-25c7d662648b@xxxxxxxxxx/ mm/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/Kconfig b/mm/Kconfig index d42423f..91fa923 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -836,6 +836,7 @@ config PERCPU_STATS config GUP_BENCHMARK bool "Enable infrastructure for get_user_pages() and related calls benchmarking" + depends on DEBUG_FS help Provides /sys/kernel/debug/gup_benchmark that helps with testing performance of get_user_pages() and related calls. -- 2.7.4
