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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>
This commit is contained in:
Miguel Ojeda 2022-07-27 21:41:56 +02:00
parent b471927ebf
commit 6e8c5bbd5e
1 changed files with 12 additions and 2 deletions
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14
scripts/kallsyms.c
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@ -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;