Re: [PATCH 10/14] parisc: Add support for suppressing warning backtraces

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On 3/12/24 18:03, Guenter Roeck wrote:
Add name of functions triggering warning backtraces to the __bug_table
object section to enable support for suppressing WARNING backtraces.

To limit image size impact, the pointer to the function name is only added
to the __bug_table section if both CONFIG_KUNIT and CONFIG_DEBUG_BUGVERBOSE
are enabled. Otherwise, the __func__ assembly parameter is replaced with a
(dummy) NULL parameter to avoid an image size increase due to unused
__func__ entries (this is necessary because __func__ is not a define but a
virtual variable).

While at it, declare assembler parameters as constants where possible.
Refine .blockz instructions to calculate the necessary padding instead
of using fixed values.

Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>


Acked-by: Helge Deller <deller@xxxxxx>

Helge


---
  arch/parisc/include/asm/bug.h | 29 +++++++++++++++++++++--------
  1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/arch/parisc/include/asm/bug.h b/arch/parisc/include/asm/bug.h
index 833555f74ffa..792dacc2a653 100644
--- a/arch/parisc/include/asm/bug.h
+++ b/arch/parisc/include/asm/bug.h
@@ -23,8 +23,17 @@
  # define __BUG_REL(val) ".word " __stringify(val)
  #endif

-
  #ifdef CONFIG_DEBUG_BUGVERBOSE
+
+#if IS_ENABLED(CONFIG_KUNIT)
+# define HAVE_BUG_FUNCTION
+# define __BUG_FUNC_PTR	__BUG_REL(%c1)
+# define __BUG_FUNC	__func__
+#else
+# define __BUG_FUNC_PTR
+# define __BUG_FUNC	NULL
+#endif /* IS_ENABLED(CONFIG_KUNIT) */
+
  #define BUG()								\
  	do {								\
  		asm volatile("\n"					\
@@ -33,10 +42,12 @@
  			     "\t.align 4\n"				\
  			     "2:\t" __BUG_REL(1b) "\n"			\
  			     "\t" __BUG_REL(%c0)  "\n"			\
-			     "\t.short %1, %2\n"			\
-			     "\t.blockz %3-2*4-2*2\n"			\
+			     "\t" __BUG_FUNC_PTR  "\n"			\
+			     "\t.short %c2, %c3\n"			\
+			     "\t.blockz %c4-(.-2b)\n"			\
  			     "\t.popsection"				\
-			     : : "i" (__FILE__), "i" (__LINE__),	\
+			     : : "i" (__FILE__), "i" (__BUG_FUNC),	\
+			     "i" (__LINE__),				\
  			     "i" (0), "i" (sizeof(struct bug_entry)) );	\
  		unreachable();						\
  	} while(0)
@@ -58,10 +69,12 @@
  			     "\t.align 4\n"				\
  			     "2:\t" __BUG_REL(1b) "\n"			\
  			     "\t" __BUG_REL(%c0)  "\n"			\
-			     "\t.short %1, %2\n"			\
-			     "\t.blockz %3-2*4-2*2\n"			\
+			     "\t" __BUG_FUNC_PTR  "\n"			\
+			     "\t.short %c2, %3\n"			\
+			     "\t.blockz %c4-(.-2b)\n"			\
  			     "\t.popsection"				\
-			     : : "i" (__FILE__), "i" (__LINE__),	\
+			     : : "i" (__FILE__), "i" (__BUG_FUNC),	\
+			     "i" (__LINE__),				\
  			     "i" (BUGFLAG_WARNING|(flags)),		\
  			     "i" (sizeof(struct bug_entry)) );		\
  	} while(0)
@@ -74,7 +87,7 @@
  			     "\t.align 4\n"				\
  			     "2:\t" __BUG_REL(1b) "\n"			\
  			     "\t.short %0\n"				\
-			     "\t.blockz %1-4-2\n"			\
+			     "\t.blockz %c1-(.-2b)\n"			\
  			     "\t.popsection"				\
  			     : : "i" (BUGFLAG_WARNING|(flags)),		\
  			     "i" (sizeof(struct bug_entry)) );		\






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