linux-kernel - Re: [tip:x86/boot] ACPI/NUMA: Add warning message if the padding size for KASLR is not enough

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Date:   Wed, 3 Oct 2018 14:34:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     m.mizuma@...fujitsu.com, bhe@...hat.com, bp@...en8.de,
        torvalds@...ux-foundation.org, msys.mizuma@...il.com,
        tglx@...utronix.de, linux-kernel@...r.kernel.org, mingo@...nel.org,
        hpa@...or.com
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/boot] ACPI/NUMA: Add warning message if the padding
 size for KASLR is not enough


Subject: ACPI/NUMA: Fix KASLR build error

There is no point in trying to compile KASLR specific code when there is
no KASLR.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 3d69834c692f..5767733976b3 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -436,7 +436,6 @@ acpi_table_parse_srat(enum acpi_srat_type id,
 int __init acpi_numa_init(void)
 {
 	int cnt = 0;
-	u64 max_possible_phys, max_actual_phys, threshold;
 
 	if (acpi_disabled)
 		return -EINVAL;
@@ -466,8 +465,11 @@ int __init acpi_numa_init(void)
 		cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 					    acpi_parse_memory_affinity, 0);
 
+#ifdef CONFIG_RANDOMIZE_MEMORY
 		/* check the padding size for KASLR is enough. */
 		if (parsed_numa_memblks && kaslr_enabled()) {
+			u64 max_possible_phys, max_actual_phys, threshold;
+
 			max_actual_phys = roundup(PFN_PHYS(max_pfn), 1ULL << 40);
 			max_possible_phys = roundup(PFN_PHYS(max_possible_pfn), 1ULL << 40);
 			threshold = max_actual_phys + ((u64)rand_mem_physical_padding << 40);
@@ -477,6 +479,7 @@ int __init acpi_numa_init(void)
 				  (max_possible_phys - max_actual_phys) >> 40);
 			}
 		}
+#endif
 	}
 
 	/* SLIT: System Locality Information Table */