The branch main has been updated by markj:
URL:
https://cgit.FreeBSD.org/src/commit/?id=23e875fd97fb9f17b3f5dc2b26082f25e1a86b6f
commit 23e875fd97fb9f17b3f5dc2b26082f25e1a86b6f
Author: Mark Johnston <ma...@freebsd.org>
AuthorDate: 2021-02-22 20:50:09 +0000
Commit: Mark Johnston <ma...@freebsd.org>
CommitDate: 2021-02-22 20:50:09 +0000
vm_kern: Avoid sign extension in the KVA_QUANTUM definition
Otherwise, on a powerpc64 NUMA system with hashed page tables, the
first-level superpage reservation size is large enough that the value of
the kernel KVA arena import quantum, KVA_NUMA_IMPORT_QUANTUM, is
negative and gets sign-extended when passed to vmem_set_import(). This
results in a boot-time hang on such platforms.
Reported by: bdragon
MFC after: 3 days
---
sys/vm/vm_kern.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
index e8e24c3ca8a3..637298eb2caa 100644
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -127,7 +127,7 @@ SYSCTL_ULONG(_vm, OID_AUTO, max_kernel_address, CTLFLAG_RD,
/* On non-superpage architectures we want large import sizes. */
#define KVA_QUANTUM_SHIFT (8 + PAGE_SHIFT)
#endif
-#define KVA_QUANTUM (1 << KVA_QUANTUM_SHIFT)
+#define KVA_QUANTUM (1ul << KVA_QUANTUM_SHIFT)
#define KVA_NUMA_IMPORT_QUANTUM (KVA_QUANTUM * 128)
extern void uma_startup2(void);
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