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bug: Add report_bug_entry()

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Add a report_bug() variant where the bug_entry is already known. This
is useful when the exception instruction is not instantiated per-site.
But instead has a single instance. In such a case the bug_entry
address might be passed along in a known register or something.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251110115757.575795595@infradead.org
This commit is contained in:
Peter Zijlstra
2025-06-07 10:52:28 +02:00
parent 5c47b7f3d1
commit 7d2c27a0ec
2 changed files with 29 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/bug.h
View File

@@ -42,6 +42,7 @@ void bug_get_file_line(struct bug_entry *bug, const char **file,
struct bug_entry *find_bug(unsigned long bugaddr);
enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
enum bug_trap_type report_bug_entry(struct bug_entry *bug, struct pt_regs *regs);
/* These are defined by the architecture */
int is_valid_bugaddr(unsigned long addr);
@@ -62,6 +63,13 @@ static inline enum bug_trap_type report_bug(unsigned long bug_addr,
}
struct bug_entry;
static inline enum bug_trap_type
report_bug_entry(struct bug_entry *bug, struct pt_regs *regs)
{
return BUG_TRAP_TYPE_BUG;
}
static inline void bug_get_file_line(struct bug_entry *bug, const char **file,
unsigned int *line)
{

28
lib/bug.c
View File

@@ -183,18 +183,20 @@ static void __warn_printf(const char *fmt, struct pt_regs *regs)
printk("%s", fmt);
}
static enum bug_trap_type __report_bug(unsigned long bugaddr, struct pt_regs *regs)
static enum bug_trap_type __report_bug(struct bug_entry *bug, unsigned long bugaddr, struct pt_regs *regs)
{
bool warning, once, done, no_cut, has_args;
const char *file, *fmt;
unsigned line;
if (!is_valid_bugaddr(bugaddr))
return BUG_TRAP_TYPE_NONE;
if (!bug) {
if (!is_valid_bugaddr(bugaddr))
return BUG_TRAP_TYPE_NONE;
bug = find_bug(bugaddr);
if (!bug)
return BUG_TRAP_TYPE_NONE;
bug = find_bug(bugaddr);
if (!bug)
return BUG_TRAP_TYPE_NONE;
}
disable_trace_on_warning();
@@ -244,13 +246,25 @@ static enum bug_trap_type __report_bug(unsigned long bugaddr, struct pt_regs *re
return BUG_TRAP_TYPE_BUG;
}
enum bug_trap_type report_bug_entry(struct bug_entry *bug, struct pt_regs *regs)
{
enum bug_trap_type ret;
bool rcu = false;
rcu = warn_rcu_enter();
ret = __report_bug(bug, 0, regs);
warn_rcu_exit(rcu);
return ret;
}
enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
{
enum bug_trap_type ret;
bool rcu = false;
rcu = warn_rcu_enter();
ret = __report_bug(bugaddr, regs);
ret = __report_bug(NULL, bugaddr, regs);
warn_rcu_exit(rcu);
return ret;