Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
bug: Add report_bug_entry()
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
+29
-7
+8
include/linux/bug.h
+8
include/linux/bug.h
···
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struct bug_entry *find_bug(unsigned long bugaddr);
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enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
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+
enum bug_trap_type report_bug_entry(struct bug_entry *bug, struct pt_regs *regs);
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/* These are defined by the architecture */
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int is_valid_bugaddr(unsigned long addr);
···
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}
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struct bug_entry;
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+
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static inline enum bug_trap_type
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report_bug_entry(struct bug_entry *bug, struct pt_regs *regs)
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{
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return BUG_TRAP_TYPE_BUG;
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}
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+
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static inline void bug_get_file_line(struct bug_entry *bug, const char **file,
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unsigned int *line)
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{
+21
-7
lib/bug.c
+21
-7
lib/bug.c
···
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printk("%s", fmt);
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}
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-
static enum bug_trap_type __report_bug(unsigned long bugaddr, struct pt_regs *regs)
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static enum bug_trap_type __report_bug(struct bug_entry *bug, unsigned long bugaddr, struct pt_regs *regs)
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{
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bool warning, once, done, no_cut, has_args;
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const char *file, *fmt;
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unsigned line;
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-
if (!is_valid_bugaddr(bugaddr))
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return BUG_TRAP_TYPE_NONE;
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if (!bug) {
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if (!is_valid_bugaddr(bugaddr))
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return BUG_TRAP_TYPE_NONE;
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-
bug = find_bug(bugaddr);
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-
if (!bug)
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-
return BUG_TRAP_TYPE_NONE;
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bug = find_bug(bugaddr);
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if (!bug)
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return BUG_TRAP_TYPE_NONE;
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}
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disable_trace_on_warning();
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···
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return BUG_TRAP_TYPE_BUG;
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}
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+
enum bug_trap_type report_bug_entry(struct bug_entry *bug, struct pt_regs *regs)
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{
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enum bug_trap_type ret;
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bool rcu = false;
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+
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rcu = warn_rcu_enter();
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ret = __report_bug(bug, 0, regs);
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warn_rcu_exit(rcu);
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+
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return ret;
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}
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+
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enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
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{
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enum bug_trap_type ret;
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bool rcu = false;
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rcu = warn_rcu_enter();
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-
ret = __report_bug(bugaddr, regs);
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ret = __report_bug(NULL, bugaddr, regs);
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warn_rcu_exit(rcu);
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return ret;