Commit-ID: 17426923b03f098da83b8c1e044934a34959f69b
Gitweb: https://git.kernel.org/tip/17426923b03f098da83b8c1e044934a34959f69b
Author: Jiri Slaby <jslaby@xxxxxxx>
AuthorDate: Fri, 18 May 2018 08:47:09 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 21 Jun 2018 16:34:55 +0200
x86/stacktrace: Remove STACKTRACE_DUMP_ONCE
The stack unwinding can sometimes fail yet. Especially with the
generated debug info. So do not yell at users -- live patching (the only
user of this interface) will inform the user about the failure
gracefully.
And given this was the only user of the macro, remove the macro proper
too.
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/lkml/20180518064713.26440-2-jslaby@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/stacktrace.c | 18 ++----------------
1 file changed, 2 insertions(+), 16 deletions(-)
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index 8948b7d9c064..f9dacf6d4667 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -81,16 +81,6 @@ EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
#ifdef CONFIG_HAVE_RELIABLE_STACKTRACE
-#define STACKTRACE_DUMP_ONCE(task) ({ \
- static bool __section(.data.unlikely) __dumped; \
- \
- if (!__dumped) { \
- __dumped = true; \
- WARN_ON(1); \
- show_stack(task, NULL); \
- } \
-})
-
static int __always_inline
__save_stack_trace_reliable(struct stack_trace *trace,
struct task_struct *task)
@@ -123,20 +113,16 @@ __save_stack_trace_reliable(struct stack_trace *trace,
* generated code which __kernel_text_address() doesn't know
* about.
*/
- if (!addr) {
- STACKTRACE_DUMP_ONCE(task);
+ if (!addr)
return -EINVAL;
- }
if (save_stack_address(trace, addr, false))
return -EINVAL;
}
/* Check for stack corruption */
- if (unwind_error(&state)) {
- STACKTRACE_DUMP_ONCE(task);
+ if (unwind_error(&state))
return -EINVAL;
- }
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
--
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