[PATCH v2 1/4] sys_info: add helper for callers that handle all_bt
From: Bradley Morgan <hidden>
Date: 2026-06-23 15:35:31
Also in:
lkml, stable
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Some callers handle SYS_INFO_ALL_BT themselves before calling sys_info(). Add a helper that strips that bit without turning an all_bt only mask into a kernel_sys_info fallback. Signed-off-by: Bradley Morgan <redacted> --- Changes since v1: - New patch for the shared helper suggested by Petr. include/linux/sys_info.h | 1 + lib/sys_info.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+)
diff --git a/include/linux/sys_info.h b/include/linux/sys_info.h
index a5bc3ea3d44b..87a841ec7b6a 100644
--- a/include/linux/sys_info.h
+++ b/include/linux/sys_info.h@@ -18,6 +18,7 @@ #define SYS_INFO_BLOCKED_TASKS 0x00000080 void sys_info(unsigned long si_mask); +void sys_info_without_all_bt(unsigned long si_mask); unsigned long sys_info_parse_param(char *str); #ifdef CONFIG_SYSCTL
diff --git a/lib/sys_info.c b/lib/sys_info.c
index f32a06ec9ed4..6afd4c697633 100644
--- a/lib/sys_info.c
+++ b/lib/sys_info.c@@ -164,3 +164,18 @@ void sys_info(unsigned long si_mask) { __sys_info(si_mask ? : kernel_si_mask); } + +void sys_info_without_all_bt(unsigned long si_mask) +{ + unsigned long dump_mask = si_mask & ~SYS_INFO_ALL_BT; + + /* + * Do not call sys_info() when the caller context required only + * backtraces from all CPUs. Otherwise sys_info() would fall back + * to the generic kernel_si_mask. + */ + if (si_mask && !dump_mask) + return; + + sys_info(dump_mask); +}
--
2.53.0