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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36faac86a96sm11069040eec.29.2026.11.06.18.40.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 18:40:31 -0800 (PST) From: Himanshu Chauhan To: Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Cc: Alexandre Ghiti , Jesse Taube , Oleg Nesterov , Kees Cook , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Shuah Khan , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-kselftest@vger.kernel.org, Himanshu Chauhan Subject: [PATCH v8 8/8] perf tests: keep bp_signal memory accesses visible Date: Sat, 7 Nov 2026 08:09:17 +0530 Message-ID: <20261107023917.40606-9-himanshu.chauhan@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261107023917.40606-1-himanshu.chauhan@oss.qualcomm.com> References: <20261107023917.40606-1-himanshu.chauhan@oss.qualcomm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=JMSuIMKb c=1 sm=1 tr=0 ts=6aee8fa1 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=tsqkxpHE8OKeFbBeJjEA:9 a=O8hF6Hzn-FEA:10 a=PxkB5W3o20Ba91AHUih5:22 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA3MDAxMCBTYWx0ZWRfX3N/JQoWTwPkm oWfh+umK9VPLBR3ehC8G6KPlAV4LD9OuKAWK+hP7WnjLKddZqzcPLMGh/pfrT04ZOOe4G60kr/X z6vjxdrbBWNB09oaz8aLnSlRZjxS4MU= X-Proofpoint-ORIG-GUID: Xm3Telpy2O_BTDTKZYnq7kI2jIgwQf4u X-Proofpoint-GUID: Xm3Telpy2O_BTDTKZYnq7kI2jIgwQf4u X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA3MDAxMCBTYWx0ZWRfX7Y5zCk/gqsSR e/7bs6SqYz6v1vVZcSDukHT6Dqq+Nv3j9kk4fQITyohlDfK2wvmVjEYFJftQhLrC+kzIb0zvIY3 jYOkxaGDtzIsxDlR7l7+6OUZwZ+Pg6W2DyJVdUK1DTh/E46Qsxkw2V3w01e3qzQXnJgYez/ssqN /d8v6Xwj2kTZG9Ogg7dHoqy4I0YugXr+/cqkMcwtjpSooRCqJmYH4p7eMa4kjIbhP0mtMbNzyIl NqHa2j16KiXwoyru+i0iZgwZ/lHO6zdx3PrzjN4Kby/5umuJCBEZ04IBIe99LdrPedb4OLJn5Jy osKNdBXMUH5BPJIruJax3BRm1iktpC7H72YAY0/5aOliHeZNw+0JbbYn/p9DYtu5qeQ1nYbAov+ C7iZJxelL/CbVI+LU5I01xC05L9vgUyzU2j+iMSMZbT+PDeXpdRabKKrDxQPmk/7YBN/POEcjm4 M1I0XvkOIcBMlnq4JvQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-07_01,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 suspectscore=0 adultscore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611070010 In the breakpoint signal handler test, a breakpoint is set on __test_function. Keep that helper as a real call target so the breakpoint has a stable address. The test also relies on the watched variable being accessed as distinct memory operations. Use READ_ONCE() and WRITE_ONCE() for those accesses instead of making the object volatile, so the source marks the exact operations that must be preserved. Signed-off-by: Himanshu Chauhan --- tools/perf/tests/bp_signal.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/tools/perf/tests/bp_signal.c b/tools/perf/tests/bp_signal.c index f580ba7486b1..2e4f7747d32f 100644 --- a/tools/perf/tests/bp_signal.c +++ b/tools/perf/tests/bp_signal.c @@ -36,15 +36,14 @@ static int fd3; static int overflows; static int overflows_2; -static volatile long the_var; - +static long the_var; /* * Use ASM to ensure watchpoint and breakpoint can be triggered * at one instruction. */ #if defined (__x86_64__) -extern void __test_function(volatile long *ptr); +extern void __test_function(long *ptr); asm ( ".pushsection .text;" ".globl __test_function\n" @@ -54,16 +53,19 @@ asm ( "ret\n" ".popsection\n"); #else -static void __test_function(volatile long *ptr) +static noinline void __test_function(long *ptr) { - *ptr = 0x1234; + WRITE_ONCE(*ptr, 0x1234); } #endif static noinline int test_function(void) { + long value; + __test_function(&the_var); - the_var++; + value = READ_ONCE(the_var); + WRITE_ONCE(the_var, value + 1); return time(NULL); } -- 2.43.0