From f9f67e5adc8dc2e1cc51ab2d3d6382fa97f074d4 Mon Sep 17 00:00:00 2001 From: Robert Richter Date: Thu, 2 May 2024 15:10:09 +0200 Subject: x86/numa: Fix SRAT lookup of CFMWS ranges with numa_fill_memblks() For configurations that have the kconfig option NUMA_KEEP_MEMINFO disabled, numa_fill_memblks() only returns with NUMA_NO_MEMBLK (-1). SRAT lookup fails then because an existing SRAT memory range cannot be found for a CFMWS address range. This causes the addition of a duplicate numa_memblk with a different node id and a subsequent page fault and kernel crash during boot. Fix this by making numa_fill_memblks() always available regardless of NUMA_KEEP_MEMINFO. As Dan suggested, the fix is implemented to remove numa_fill_memblks() from sparsemem.h and alos using __weak for the function. Note that the issue was initially introduced with [1]. But since phys_to_target_node() was originally used that returned the valid node 0, an additional numa_memblk was not added. Though, the node id was wrong too, a message is seen then in the logs: kernel/numa.c: pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n", [1] commit fd49f99c1809 ("ACPI: NUMA: Add a node and memblk for each CFMWS not in SRAT") Suggested-by: Dan Williams Link: https://lore.kernel.org/all/66271b0072317_69102944c@dwillia2-xfh.jf.intel.com.notmuch/ Fixes: 8f1004679987 ("ACPI/NUMA: Apply SRAT proximity domain to entire CFMWS window") Reviewed-by: Jonathan Cameron Reviewed-by: Alison Schofield Reviewed-by: Dan Williams Signed-off-by: Robert Richter Acked-by: Borislav Petkov (AMD) Signed-off-by: Rafael J. Wysocki --- drivers/acpi/numa/srat.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/acpi') diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index e45e64993c50..3b09fd39eeb4 100644 --- a/drivers/acpi/numa/srat.c +++ b/drivers/acpi/numa/srat.c @@ -208,6 +208,11 @@ int __init srat_disabled(void) return acpi_numa < 0; } +__weak int __init numa_fill_memblks(u64 start, u64 end) +{ + return NUMA_NO_MEMBLK; +} + #if defined(CONFIG_X86) || defined(CONFIG_ARM64) || defined(CONFIG_LOONGARCH) /* * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for -- cgit v1.2.3