Merge pull request #891 from ojeda/comments

kallsyms and Makefile: add a couple comments

Author: ojeda

Makefile

@@ -596,6 +596,7 @@ ifdef RUST_LIB_SRC
 	export RUST_LIB_SRC
 endif
 
+# Allows the usage of unstable features in stable compilers.
 export RUSTC_BOOTSTRAP := 1
 
 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG

scripts/kallsyms.c

@@ -32,7 +32,13 @@
 
 #define KSYM_NAME_LEN		512
 
-/* A substantially bigger size than the current maximum. */
+/*
+ * A substantially bigger size than the current maximum.
+ *
+ * It cannot be defined as an expression because it gets stringified
+ * for the fscanf() format string. Therefore, a _Static_assert() is
+ * used instead to maintain the relationship with KSYM_NAME_LEN.
+ */
 #define KSYM_NAME_LEN_BUFFER	2048
 _Static_assert(
 	KSYM_NAME_LEN_BUFFER == KSYM_NAME_LEN * 4,