[PATCH -next,V2] cachefiles: support to disable assert macro

[WoZ1zh1]

In fs/cachefiles/internal.h, ASSERT macro is enabled by default and can
not be disabled, then assert failure will crash the kernel as the BUG()
is included in the ASSERT macro. Therefore, add CACHEFILES_ASSERT to
control it.

Signed-off-by: WoZ1zh1 <wozizhi@xxxxxxxxxx>
---
 fs/cachefiles/Kconfig    | 11 +++++++++++
 fs/cachefiles/internal.h |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/fs/cachefiles/Kconfig b/fs/cachefiles/Kconfig
index 8df715640a48..83d8ec3ba2d8 100644
--- a/fs/cachefiles/Kconfig
+++ b/fs/cachefiles/Kconfig
@@ -38,3 +38,14 @@ config CACHEFILES_ONDEMAND
 	  and is delegated to userspace.
 
 	  If unsure, say N.
+
+config CACHEFILES_ASSERT
+	bool "CACHEFILES asserts"
+	default n
+	depends on CACHEFILES
+	help
+	  Support the ASSERT mode for failure behavior.
+	  Say N here to disable the ASSERT by default.
+	  Say Y to add assertion checks in some places. But the assertion
+	  failure will result in fatal errors that BUG() the kernel.
+
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 2ad58c465208..263b1f13e943 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -425,7 +425,7 @@ do {							\
 #define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
 #endif
 
-#if 1 /* defined(__KDEBUGALL) */
+#ifdef CONFIG_CACHEFILES_ASSERT
 
 #define ASSERT(X)							\
 do {									\
-- 
2.39.2