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authorMiguel Ojeda <ojeda@kernel.org>2022-07-27 21:41:56 +0200
committerMiguel Ojeda <ojeda@kernel.org>2022-09-28 08:55:08 +0200
commit6e8c5bbd5e83e649251c198e743c8b9e7c48372b (patch)
tree21ebec7cb52492cc4139be2f4dbc219d0521331b
parentb471927ebf9bb54ba6e99f20848d70193e645eed (diff)
kallsyms: add static relationship between `KSYM_NAME_LEN{,_BUFFER}`
This adds a static assert to ensure `KSYM_NAME_LEN_BUFFER` gets updated when `KSYM_NAME_LEN` changes. The relationship used is one that keeps the new size (512+1) close to the original buffer size (500). Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Co-developed-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
-rw-r--r--scripts/kallsyms.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 25e2fe5fbcd4..411ff5058b51 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -32,8 +32,18 @@
#define KSYM_NAME_LEN 128
-/* A substantially bigger size than the current maximum. */
-#define KSYM_NAME_LEN_BUFFER 499
+/*
+ * 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 512
+_Static_assert(
+ KSYM_NAME_LEN_BUFFER == KSYM_NAME_LEN * 4,
+ "Please keep KSYM_NAME_LEN_BUFFER in sync with KSYM_NAME_LEN"
+);
struct sym_entry {
unsigned long long addr;