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Mon, 18 Aug 2025 05:28:38 -0700 (PDT) From: Jinchao Wang To: akpm@linux-foundation.org Cc: mhiramat@kernel.org, naveen@kernel.org, davem@davemloft.net, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Jinchao Wang Subject: [RFC PATCH 09/13] mm/kstackwatch: Add architecture support validation Date: Mon, 18 Aug 2025 20:26:14 +0800 Message-ID: <20250818122720.434981-10-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250818122720.434981-9-wangjinchao600@gmail.com> References: <20250818122720.434981-1-wangjinchao600@gmail.com> <20250818122720.434981-2-wangjinchao600@gmail.com> <20250818122720.434981-3-wangjinchao600@gmail.com> <20250818122720.434981-4-wangjinchao600@gmail.com> <20250818122720.434981-5-wangjinchao600@gmail.com> <20250818122720.434981-6-wangjinchao600@gmail.com> <20250818122720.434981-7-wangjinchao600@gmail.com> <20250818122720.434981-8-wangjinchao600@gmail.com> <20250818122720.434981-9-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 740C8C000A X-Stat-Signature: pn51rrt4xc7fdsmb1n6ui9qnntokn88w X-Rspam-User: X-HE-Tag: 1755520120-678017 X-HE-Meta: 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 nIGEfMHA BMveITSEV+VMNDbJS82hYNmW0wyfseUXnvohhM2qmDfFGcInt/3lDLjqoetI+CXFQxLNiWvDiiW2DjlNlqxSVEdnm+GSCGUE2+5BlUP6yc1fXQl+Ol7FQrwdp1RJT92k06QvRjiY7q3PvzXNWYqPokoDsBpu3z+tBVIYVJHT7c5i7tIc73tTTwLAs17pHlaqdEpZdOUOT8P4mBhVn6SlpI8n0RpqhpWScDwCxrYcp+JpgVe2X0OAsKsN6OVyYSTEPyfDOftXChIEQGSb8IxGvqCV48cwFJWEtwg6zvvttYHqfpzneAU6VFOdqbhy8dSzQDouFuMl24AR8dZg9b+5aDreYv0KaONEM8TXWQtsK13qRFefDrmD8Mdb7+xQYM2zkTK+QF+sTiZ50FbbbrhBzzVQJXLWuJlSfpiKunomByTM/wFVw6K47TA2F0P8UbKm6GHCI X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add architecture compatibility checking during module initialization to ensure kstackwatch operates only on supported platforms. Currently supported architectures: - x86_64: Full hardware breakpoint support with arch_reinstall_hw_breakpoint() Signed-off-by: Jinchao Wang --- mm/kstackwatch/kernel.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/mm/kstackwatch/kernel.c b/mm/kstackwatch/kernel.c index b6366808e891..9f01e0222210 100644 --- a/mm/kstackwatch/kernel.c +++ b/mm/kstackwatch/kernel.c @@ -189,8 +189,31 @@ static const struct proc_ops kstackwatch_proc_ops = { .proc_release = single_release, }; +static int is_ksw_supported(void) +{ + static const char *const supported_archs[] = { "x86_64", NULL }; + + const char *current_arch = utsname()->machine; + int i; + + for (i = 0; supported_archs[i] != NULL; i++) { + if (strcmp(current_arch, supported_archs[i]) == 0) { + pr_info("KSW: Architecture %s supports hardware breakpoints\n", + current_arch); + return 1; + } + } + + pr_warn("KSW: Architecture %s may not support hardware breakpoints\n", + current_arch); + return 1; +} + static int __init kstackwatch_init(void) { + if (!is_ksw_supported()) + return -EOPNOTSUPP; + ksw_config = kmalloc(sizeof(*ksw_config), GFP_KERNEL); if (!ksw_config) return -ENOMEM; -- 2.43.0