linux-kernel - [PATCH 6/7] kcov: disable instrumentation for genalloc and bitmap

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Message-ID: <20250114-kcov-v1-6-004294b931a2@quicinc.com>
Date: Tue, 14 Jan 2025 13:34:36 +0800
From: "Jiao, Joey" <quic_jiangenj@...cinc.com>
To: Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov
	<andreyknvl@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton
	<akpm@...ux-foundation.org>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo
	<tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Catalin Marinas
	<catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
CC: <kasan-dev@...glegroups.com>, <linux-kernel@...r.kernel.org>,
        <workflows@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-arm-kernel@...ts.infradead.org>,
        <kernel@...cinc.com>
Subject: [PATCH 6/7] kcov: disable instrumentation for genalloc and bitmap

gen_pool_alloc in kcov_map_add triggers recursive call, which trigger
BUG: TASK stack guard page was hit at ffffc9000451ff38.

Disable KCOV to avoid the recursive call.

Signed-off-by: Jiao, Joey <quic_jiangenj@...cinc.com>
---
 lib/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Makefile b/lib/Makefile
index a8155c972f02856fcc61ee949ddda436cfe211ff..7a110a9a4a527b881ca3a0239d0b60511cb6e38b 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -15,6 +15,8 @@ KCOV_INSTRUMENT_debugobjects.o := n
 KCOV_INSTRUMENT_dynamic_debug.o := n
 KCOV_INSTRUMENT_fault-inject.o := n
 KCOV_INSTRUMENT_find_bit.o := n
+KCOV_INSTRUMENT_genalloc.o := n
+KCOV_INSTRUMENT_bitmap.o := n
 
 # string.o implements standard library functions like memset/memcpy etc.
 # Use -ffreestanding to ensure that the compiler does not try to "optimize"

-- 
2.47.1