linux-kernel - [PATCH] cxl_test: require 64-bit

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Date:   Mon, 19 Dec 2022 11:50:50 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     alison.schofield@...el.com, vishal.l.verma@...el.com,
        ira.weiny@...el.com, bwidawsk@...nel.org, dan.j.williams@...el.com
Cc:     dave@...olabs.net, a.manzanares@...sung.com, mcgrof@...nel.org,
        linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] cxl_test: require 64-bit

size_t is limited to 32-bits and so the gen_pool_alloc() using
the size of SZ_64G would map to 0, triggering a low allocation
which is not expected. Force the dependency on 64-bit for cxl_test
as that is what it was designed for.

This issue was found by build test reports when converting this
driver as a proper upstream driver.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 tools/testing/cxl/config_check.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/cxl/config_check.c b/tools/testing/cxl/config_check.c
index c4c457e59841..99b56b5f6edf 100644
--- a/tools/testing/cxl/config_check.c
+++ b/tools/testing/cxl/config_check.c
@@ -7,6 +7,7 @@ void check(void)
 	 * These kconfig symbols must be set to "m" for cxl_test to load
 	 * and operate.
 	 */
+	BUILD_BUG_ON(!IS_ENABLED(CONFIG_64BIT));
 	BUILD_BUG_ON(!IS_MODULE(CONFIG_CXL_BUS));
 	BUILD_BUG_ON(!IS_MODULE(CONFIG_CXL_ACPI));
 	BUILD_BUG_ON(!IS_MODULE(CONFIG_CXL_PMEM));
-- 
2.35.1