linux-kernel - [PATCH 1/1] cxl/acpi: Fix using extra xormaps for address translation

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Message-Id: <20260115131648.620177-1-ming.li@zohomail.com>
Date: Thu, 15 Jan 2026 21:16:48 +0800
From: Li Ming <ming.li@...omail.com>
To: dave@...olabs.net,
	jonathan.cameron@...wei.com,
	dave.jiang@...el.com,
	alison.schofield@...el.com,
	vishal.l.verma@...el.com,
	ira.weiny@...el.com,
	dan.j.williams@...el.com
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Li Ming <ming.li@...omail.com>
Subject: [PATCH 1/1] cxl/acpi: Fix using extra xormaps for address translation

CXL r3.1 Table 9-22 defines a fixed number of XOR maps for interleave
arithmetic based on the number of interleave ways, as reflected by
hbiw_to_nr_maps[].

The current implementation applies all XOR maps during address
translation, but it should use the spec-defined number of XOR maps
derived from the number of interleave ways.

Fixes: 3b2fedcd75e3 ("cxl: Restore XOR'd position bits during address translation")
Signed-off-by: Li Ming <ming.li@...omail.com>
---
 drivers/cxl/acpi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 77ac940e3013..5f84d01e7d39 100644
--- a/drivers/cxl/acpi.c
+++ b/drivers/cxl/acpi.c
@@ -61,7 +61,7 @@ u64 cxl_do_xormap_calc(struct cxl_cxims_data *cximsd, u64 addr, int hbiw)
 	 * bits results in val==0, if odd the XOR result is val==1.
 	 */
 
-	for (int i = 0; i < cximsd->nr_maps; i++) {
+	for (int i = 0; i < nr_maps_to_apply; i++) {
 		if (!cximsd->xormaps[i])
 			continue;
 		pos = __ffs(cximsd->xormaps[i]);
-- 
2.34.1