From: Guenter Roeck <linux@roeck-us.net>
To: linux-kselftest@vger.kernel.org
Cc: loongarch@lists.linux.dev, linux-doc@vger.kernel.org,
dri-devel@lists.freedesktop.org,
"Brendan Higgins" <brendan.higgins@linux.dev>,
linux-riscv@lists.infradead.org,
"David Airlie" <airlied@gmail.com>,
"Arthur Grillo" <arthurgrillo@riseup.net>,
"Ville Syrjälä" <ville.syrjala@linux.intel.com>,
linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
"Daniel Diaz" <daniel.diaz@linaro.org>,
linux-sh@vger.kernel.org,
"Naresh Kamboju" <naresh.kamboju@linaro.org>,
"Maíra Canal" <mcanal@igalia.com>,
"Dan Carpenter" <dan.carpenter@linaro.org>,
"Linux Kernel Functional Testing" <lkft@linaro.org>,
"Guenter Roeck" <linux@roeck-us.net>,
"Kees Cook" <keescook@chromium.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"David Gow" <davidgow@google.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
linux-arm-kernel@lists.infradead.org, kunit-dev@googlegroups.com,
linux-parisc@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Andrew Morton" <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v2 14/14] powerpc: Add support for suppressing warning backtraces
Date: Mon, 25 Mar 2024 10:52:48 -0700 [thread overview]
Message-ID: <20240325175248.1499046-15-linux@roeck-us.net> (raw)
In-Reply-To: <20240325175248.1499046-1-linux@roeck-us.net>
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_SUPPRESS_BACKTRACE 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).
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Acked-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
- Rebased to v6.9-rc1
- Added Tested-by:, Acked-by:, and Reviewed-by: tags
- Introduced KUNIT_SUPPRESS_BACKTRACE configuration option
arch/powerpc/include/asm/bug.h | 37 +++++++++++++++++++++++++---------
1 file changed, 28 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h
index 1db485aacbd9..5b06745d20aa 100644
--- a/arch/powerpc/include/asm/bug.h
+++ b/arch/powerpc/include/asm/bug.h
@@ -14,6 +14,9 @@
.section __bug_table,"aw"
5001: .4byte \addr - .
.4byte 5002f - .
+#ifdef CONFIG_KUNIT_SUPPRESS_BACKTRACE
+ .4byte 0
+#endif
.short \line, \flags
.org 5001b+BUG_ENTRY_SIZE
.previous
@@ -32,30 +35,46 @@
#endif /* verbose */
#else /* !__ASSEMBLY__ */
-/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
- sizeof(struct bug_entry), respectively */
+/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3,%4 to be FILE, __func__, LINE, flags
+ and sizeof(struct bug_entry), respectively */
#ifdef CONFIG_DEBUG_BUGVERBOSE
+
+#ifdef CONFIG_KUNIT_SUPPRESS_BACKTRACE
+# define HAVE_BUG_FUNCTION
+# define __BUG_FUNC_PTR " .4byte %1 - .\n"
+#else
+# define __BUG_FUNC_PTR
+#endif /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */
+
#define _EMIT_BUG_ENTRY \
".section __bug_table,\"aw\"\n" \
"2: .4byte 1b - .\n" \
" .4byte %0 - .\n" \
- " .short %1, %2\n" \
- ".org 2b+%3\n" \
+ __BUG_FUNC_PTR \
+ " .short %2, %3\n" \
+ ".org 2b+%4\n" \
".previous\n"
#else
#define _EMIT_BUG_ENTRY \
".section __bug_table,\"aw\"\n" \
"2: .4byte 1b - .\n" \
- " .short %2\n" \
- ".org 2b+%3\n" \
+ " .short %3\n" \
+ ".org 2b+%4\n" \
".previous\n"
#endif
+#ifdef HAVE_BUG_FUNCTION
+# define __BUG_FUNC __func__
+#else
+# define __BUG_FUNC NULL
+#endif
+
#define BUG_ENTRY(insn, flags, ...) \
__asm__ __volatile__( \
"1: " insn "\n" \
_EMIT_BUG_ENTRY \
- : : "i" (__FILE__), "i" (__LINE__), \
+ : : "i" (__FILE__), "i" (__BUG_FUNC), \
+ "i" (__LINE__), \
"i" (flags), \
"i" (sizeof(struct bug_entry)), \
##__VA_ARGS__)
@@ -80,7 +99,7 @@
if (x) \
BUG(); \
} else { \
- BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \
+ BUG_ENTRY(PPC_TLNEI " %5, 0", 0, "r" ((__force long)(x))); \
} \
} while (0)
@@ -90,7 +109,7 @@
if (__ret_warn_on) \
__WARN(); \
} else { \
- BUG_ENTRY(PPC_TLNEI " %4, 0", \
+ BUG_ENTRY(PPC_TLNEI " %5, 0", \
BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
"r" (__ret_warn_on)); \
} \
--
2.39.2
prev parent reply other threads:[~2024-03-25 18:03 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-25 17:52 [PATCH v2 00/14] Add support for suppressing warning backtraces Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 01/14] bug/kunit: Core " Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 02/14] kunit: bug: Count suppressed " Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 03/14] kunit: Add test cases for backtrace warning suppression Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 04/14] kunit: Add documentation for warning backtrace suppression API Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 05/14] drm: Suppress intentional warning backtraces in scaling unit tests Guenter Roeck
2024-03-25 19:05 ` Maíra Canal
2024-03-25 19:24 ` Guenter Roeck
2024-03-26 1:09 ` Maíra Canal
2024-03-26 5:02 ` Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 06/14] net: kunit: Suppress lock warning noise at end of dev_addr_lists tests Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 07/14] x86: Add support for suppressing warning backtraces Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 08/14] arm64: " Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 09/14] loongarch: " Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 10/14] parisc: " Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 11/14] s390: " Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 12/14] sh: " Guenter Roeck
2024-03-27 14:44 ` Simon Horman
2024-03-27 15:10 ` Guenter Roeck
2024-03-27 19:39 ` Simon Horman
2024-03-29 15:40 ` Guenter Roeck
2024-03-25 17:52 ` [PATCH v2 13/14] riscv: " Guenter Roeck
2024-03-25 17:52 ` Guenter Roeck [this message]
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