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bugs/core: Introduce the CONFIG_DEBUG_BUGVERBOSE_DETAILED Kconfig switch

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Allow configurability of the inclusion of more detailed
WARN_ON() strings, to be implemented in subsequent
commits.

Since the full cost will be around 100K more memory on
an x86 defconfig, disable it by default.

Provide the WARN_CONDITION_STR() macro to allow the conditional
passing of extra strings to lower level BUG/WARN handlers.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-arch@vger.kernel.org
Link: https://lore.kernel.org/r/20250515124644.2958810-4-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2025-05-15 14:46:32 +02:00
commit 687fac9d1b
2 changed files with 16 additions and 0 deletions
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6
include/asm-generic/bug.h
View file

@ -17,6 +17,12 @@
#define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
#endif
#ifdef CONFIG_DEBUG_BUGVERBOSE_DETAILED
# define WARN_CONDITION_STR(cond_str) cond_str
#else
# define WARN_CONDITION_STR(cond_str)
#endif
#ifndef __ASSEMBLY__
#include <linux/panic.h>
#include <linux/printk.h>

10
lib/Kconfig.debug
View file

@ -206,6 +206,16 @@ config DEBUG_BUGVERBOSE
of the BUG call as well as the EIP and oops trace. This aids
debugging but costs about 70-100K of memory.
config DEBUG_BUGVERBOSE_DETAILED
bool "Verbose WARN_ON_ONCE() reporting (adds 100K)" if DEBUG_BUGVERBOSE
help
Say Y here to make WARN_ON_ONCE() output the condition string of the
warning, in addition to the file name and line number.
This helps debugging, but costs about 100K of memory.
Say N if unsure.
endmenu # "printk and dmesg options"
config DEBUG_KERNEL