[patch 042/200] mm/gup_test: GUP_TEST depends on DEBUG_FS

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From: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
Subject: mm/gup_test: GUP_TEST depends on DEBUG_FS

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_TEST can do nothing without DEBUG_FS.

[song.bao.hua@xxxxxxxxxxxxx: add comment as a prompt to users as commented by John and Randy]
  Link: https://lkml.kernel.org/r/20201108083732.15336-1-song.bao.hua@xxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20201104100552.20156-1-song.bao.hua@xxxxxxxxxxxxx
Signed-off-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
Suggested-by: John Garry <john.garry@xxxxxxxxxx>
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/Kconfig |    4 ++++
 1 file changed, 4 insertions(+)

--- a/mm/Kconfig~mm-gup_benchmark-gup_benchmark-depends-on-debug_fs
+++ a/mm/Kconfig
@@ -823,6 +823,7 @@ config PERCPU_STATS
 
 config GUP_TEST
 	bool "Enable infrastructure for get_user_pages()-related unit tests"
+	depends on DEBUG_FS
 	help
 	  Provides /sys/kernel/debug/gup_test, which in turn provides a way
 	  to make ioctl calls that can launch kernel-based unit tests for
@@ -840,6 +841,9 @@ config GUP_TEST
 
 	  See tools/testing/selftests/vm/gup_test.c
 
+comment "GUP_TEST needs to have DEBUG_FS enabled"
+	depends on !GUP_TEST && !DEBUG_FS
+
 config GUP_GET_PTE_LOW_HIGH
 	bool
 
_




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