mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 15:36:48 +00:00
30cee1e486
As of now during link list corruption it prints about cluprit address and its wrong value, but sometime it is not enough to catch the actual issue point. If it prints allocation and free path of that corrupted node, it will be a lot easier to find and fix the issues. Adding the same information when data mismatch is found in link list debug data: [ 14.243055] slab kmalloc-32 start ffff0000cda19320 data offset 32 pointer offset 8 size 32 allocated at add_to_list+0x28/0xb0 [ 14.245259] __kmalloc_cache_noprof+0x1c4/0x358 [ 14.245572] add_to_list+0x28/0xb0 ... [ 14.248632] do_el0_svc_compat+0x1c/0x34 [ 14.249018] el0_svc_compat+0x2c/0x80 [ 14.249244] Free path: [ 14.249410] kfree+0x24c/0x2f0 [ 14.249724] do_force_corruption+0xbc/0x100 ... [ 14.252266] el0_svc_common.constprop.0+0x40/0xe0 [ 14.252540] do_el0_svc_compat+0x1c/0x34 [ 14.252763] el0_svc_compat+0x2c/0x80 [ 14.253071] ------------[ cut here ]------------ [ 14.253303] list_del corruption. next->prev should be ffff0000cda192a8, but was 6b6b6b6b6b6b6b6b. (next=ffff0000cda19348) [ 14.254255] WARNING: CPU: 3 PID: 84 at lib/list_debug.c:65 __list_del_entry_valid_or_report+0x158/0x164 Moved prototype of mem_dump_obj() to bug.h, as mm.h can not be included in bug.h. Link: https://lkml.kernel.org/r/20241230101043.53773-1-maninder1.s@samsung.com Signed-off-by: Maninder Singh <maninder1.s@samsung.com> Acked-by: Jan Kara <jack@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Marco Elver <elver@google.com> Cc: Rohit Thapliyal <r.thapliyal@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_BUG_H
|
|
#define _LINUX_BUG_H
|
|
|
|
#include <asm/bug.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/build_bug.h>
|
|
|
|
enum bug_trap_type {
|
|
BUG_TRAP_TYPE_NONE = 0,
|
|
BUG_TRAP_TYPE_WARN = 1,
|
|
BUG_TRAP_TYPE_BUG = 2,
|
|
};
|
|
|
|
struct pt_regs;
|
|
|
|
#ifdef __CHECKER__
|
|
#define MAYBE_BUILD_BUG_ON(cond) (0)
|
|
#else /* __CHECKER__ */
|
|
|
|
#define MAYBE_BUILD_BUG_ON(cond) \
|
|
do { \
|
|
if (__builtin_constant_p((cond))) \
|
|
BUILD_BUG_ON(cond); \
|
|
else \
|
|
BUG_ON(cond); \
|
|
} while (0)
|
|
|
|
#endif /* __CHECKER__ */
|
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
#include <asm-generic/bug.h>
|
|
|
|
static inline int is_warning_bug(const struct bug_entry *bug)
|
|
{
|
|
return bug->flags & BUGFLAG_WARNING;
|
|
}
|
|
|
|
void bug_get_file_line(struct bug_entry *bug, const char **file,
|
|
unsigned int *line);
|
|
|
|
struct bug_entry *find_bug(unsigned long bugaddr);
|
|
|
|
enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
|
|
|
|
/* These are defined by the architecture */
|
|
int is_valid_bugaddr(unsigned long addr);
|
|
|
|
void generic_bug_clear_once(void);
|
|
|
|
#else /* !CONFIG_GENERIC_BUG */
|
|
|
|
static inline void *find_bug(unsigned long bugaddr)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline enum bug_trap_type report_bug(unsigned long bug_addr,
|
|
struct pt_regs *regs)
|
|
{
|
|
return BUG_TRAP_TYPE_BUG;
|
|
}
|
|
|
|
struct bug_entry;
|
|
static inline void bug_get_file_line(struct bug_entry *bug, const char **file,
|
|
unsigned int *line)
|
|
{
|
|
*file = NULL;
|
|
*line = 0;
|
|
}
|
|
|
|
static inline void generic_bug_clear_once(void) {}
|
|
|
|
#endif /* CONFIG_GENERIC_BUG */
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
void mem_dump_obj(void *object);
|
|
#else
|
|
static inline void mem_dump_obj(void *object) {}
|
|
#endif
|
|
|
|
/*
|
|
* Since detected data corruption should stop operation on the affected
|
|
* structures. Return value must be checked and sanely acted on by caller.
|
|
*/
|
|
static inline __must_check bool check_data_corruption(bool v) { return v; }
|
|
#define CHECK_DATA_CORRUPTION(condition, addr, fmt, ...) \
|
|
check_data_corruption(({ \
|
|
bool corruption = unlikely(condition); \
|
|
if (corruption) { \
|
|
if (addr) \
|
|
mem_dump_obj(addr); \
|
|
if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
|
|
pr_err(fmt, ##__VA_ARGS__); \
|
|
BUG(); \
|
|
} else \
|
|
WARN(1, fmt, ##__VA_ARGS__); \
|
|
} \
|
|
corruption; \
|
|
}))
|
|
|
|
#endif /* _LINUX_BUG_H */
|