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resource: fix false warning in __request_region()

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commit 91a229bb7b upstream.

A warning is raised when __request_region() detects a conflict with a
resource whose resource.desc is IORES_DESC_DEVICE_PRIVATE_MEMORY.

But this warning is only valid for iomem_resources.
The hmem device resource uses resource.desc as the numa node id, which can
cause spurious warnings.

This warning appeared on a machine with multiple cxl memory expanders.
One of the NUMA node id is 6, which is the same as the value of
IORES_DESC_DEVICE_PRIVATE_MEMORY.

In this environment it was just a spurious warning, but when I saw the
warning I suspected a real problem so it's better to fix it.

This change fixes this by restricting the warning to only iomem_resource.
This also adds a missing new line to the warning message.

Link: https://lkml.kernel.org/r/20250719112604.25500-1-akinobu.mita@gmail.com
Fixes: 7dab174e2e ("dax/hmem: Move hmem device registration to dax_hmem.ko")
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Akinobu Mita 2025-07-19 20:26:04 +09:00 committed by Greg Kroah-Hartman
parent bf585ee198
commit a2cd4dcbb7
1 changed files with 3 additions and 2 deletions
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5
kernel/resource.c
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@ -1222,8 +1222,9 @@ static int __request_region_locked(struct resource *res, struct resource *parent
* become unavailable to other users. Conflicts are
* not expected. Warn to aid debugging if encountered.
*/
if (conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) {
pr_warn("Unaddressable device %s %pR conflicts with %pR",
if (parent == &iomem_resource &&
conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) {
pr_warn("Unaddressable device %s %pR conflicts with %pR\n",
conflict->name, conflict, res);
}
if (conflict != parent) {