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Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 asm updates from Ingo Molnar:
 "The main changes in this cycle were:

   - unwinder fixes and enhancements

   - improve ftrace interaction with the unwinder

   - optimize the code footprint of WARN() and related debugging
     constructs

   - ... plus misc updates, cleanups and fixes"

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  x86/unwind: Dump all stacks in unwind_dump()
  x86/unwind: Silence more entry-code related warnings
  x86/ftrace: Fix ebp in ftrace_regs_caller that screws up unwinder
  x86/unwind: Remove unused 'sp' parameter in unwind_dump()
  x86/unwind: Prepend hex mask value with '0x' in unwind_dump()
  x86/unwind: Properly zero-pad 32-bit values in unwind_dump()
  x86/unwind: Ensure stack pointer is aligned
  debug: Avoid setting BUGFLAG_WARNING twice
  x86/unwind: Silence entry-related warnings
  x86/unwind: Read stack return address in update_stack_state()
  x86/unwind: Move common code into update_stack_state()
  debug: Fix __bug_table[] in arch linker scripts
  debug: Add _ONCE() logic to report_bug()
  x86/debug: Define BUG() again for !CONFIG_BUG
  x86/debug: Implement __WARN() using UD0
  x86/ftrace: Use Makefile logic instead of #ifdef for compiling ftrace_*.o
  x86/ftrace: Add -mfentry support to x86_32 with DYNAMIC_FTRACE set
  x86/ftrace: Clean up ftrace_regs_caller
  x86/ftrace: Add stack frame pointer to ftrace_caller
  x86/ftrace: Move the ftrace specific code out of entry_32.S
  ...
This commit is contained in:
Linus Torvalds
2017-05-01 22:07:51 -07:00
parent 12ca7c8db3 262fa734a0
commit 3fb9268e43
38 changed files with 595 additions and 405 deletions
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28
lib/bug.c
View File

@@ -47,7 +47,7 @@
#include <linux/sched.h>
#include <linux/rculist.h>
extern const struct bug_entry __start___bug_table[], __stop___bug_table[];
extern struct bug_entry __start___bug_table[], __stop___bug_table[];
static inline unsigned long bug_addr(const struct bug_entry *bug)
{
@@ -62,10 +62,10 @@ static inline unsigned long bug_addr(const struct bug_entry *bug)
/* Updates are protected by module mutex */
static LIST_HEAD(module_bug_list);
static const struct bug_entry *module_find_bug(unsigned long bugaddr)
static struct bug_entry *module_find_bug(unsigned long bugaddr)
{
struct module *mod;
const struct bug_entry *bug = NULL;
struct bug_entry *bug = NULL;
rcu_read_lock_sched();
list_for_each_entry_rcu(mod, &module_bug_list, bug_list) {
@@ -122,15 +122,15 @@ void module_bug_cleanup(struct module *mod)
#else
static inline const struct bug_entry *module_find_bug(unsigned long bugaddr)
static inline struct bug_entry *module_find_bug(unsigned long bugaddr)
{
return NULL;
}
#endif
const struct bug_entry *find_bug(unsigned long bugaddr)
struct bug_entry *find_bug(unsigned long bugaddr)
{
const struct bug_entry *bug;
struct bug_entry *bug;
for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
if (bugaddr == bug_addr(bug))
@@ -141,9 +141,9 @@ const struct bug_entry *find_bug(unsigned long bugaddr)
enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
{
const struct bug_entry *bug;
struct bug_entry *bug;
const char *file;
unsigned line, warning;
unsigned line, warning, once, done;
if (!is_valid_bugaddr(bugaddr))
return BUG_TRAP_TYPE_NONE;
@@ -164,6 +164,18 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
line = bug->line;
#endif
warning = (bug->flags & BUGFLAG_WARNING) != 0;
once = (bug->flags & BUGFLAG_ONCE) != 0;
done = (bug->flags & BUGFLAG_DONE) != 0;
if (warning && once) {
if (done)
return BUG_TRAP_TYPE_WARN;
/*
* Since this is the only store, concurrency is not an issue.
*/
bug->flags |= BUGFLAG_DONE;
}
}
if (warning) {