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x86/platform/uv: Handle deconfigured sockets

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When a socket is deconfigured, it's mapped to SOCK_EMPTY (0xffff). This causes
a panic while allocating UV hub info structures.

Fix this by using NUMA_NO_NODE, allowing UV hub info structures to be
allocated on valid nodes.

Fixes: 8a50c58519 ("x86/platform/uv: UV support for sub-NUMA clustering")
Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/ab2BmGL0ehVkkjKk@hpe.com
This commit is contained in:
Kyle Meyer
2026-03-20 12:19:20 -05:00
committed by Borislav Petkov (AMD)
parent 63f8b60151
commit 1f6aa5bbf1
1 changed files with 16 additions and 2 deletions
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18
arch/x86/kernel/apic/x2apic_uv_x.c
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@@ -1708,8 +1708,22 @@ static void __init uv_system_init_hub(void)
struct uv_hub_info_s *new_hub;
/* Allocate & fill new per hub info list */
new_hub = (bid == 0) ? &uv_hub_info_node0
: kzalloc_node(bytes, GFP_KERNEL, uv_blade_to_node(bid));
if (bid == 0) {
new_hub = &uv_hub_info_node0;
} else {
int nid;
/*
* Deconfigured sockets are mapped to SOCK_EMPTY. Use
* NUMA_NO_NODE to allocate on a valid node.
*/
nid = uv_blade_to_node(bid);
if (nid == SOCK_EMPTY)
nid = NUMA_NO_NODE;
new_hub = kzalloc_node(bytes, GFP_KERNEL, nid);
}
if (WARN_ON_ONCE(!new_hub)) {
/* do not kfree() bid 0, which is statically allocated */
while (--bid > 0)