With Linux 4.19-rc1 commit 7d4340bb92a9df78e6e28152f3dd89d9bd82146b,

titled "powerpc/mm: Increase MAX_PHYSMEM_BITS to 128TB with SPARSEMEM_VMEMMAP config", the PPC64 MAX_PHYSMEM_BITS value has been bumped up to 47. The appropriate update has been made in this patch. ([email protected])
d3dave · Sep 27, 2018 · 599a657 · 599a657
1 parent 27a6ebd
commit 599a657
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/defs.h b/defs.h
@@ -4073,6 +4073,7 @@ struct efi_memory_desc_t {
 #define _SECTION_SIZE_BITS	24
 #define _MAX_PHYSMEM_BITS	44
 #define _MAX_PHYSMEM_BITS_3_7   46
+#define _MAX_PHYSMEM_BITS_4_19  47
 
 #endif /* PPC64 */
 

diff --git a/ppc64.c b/ppc64.c
@@ -554,7 +554,10 @@ ppc64_init(int when)
 			ppc64_vmemmap_init();
 
 		machdep->section_size_bits = _SECTION_SIZE_BITS;
-		if (THIS_KERNEL_VERSION >= LINUX(3,7,0))
+		if ((machdep->flags & VMEMMAP) &&
+		    (THIS_KERNEL_VERSION >= LINUX(4,19,0)))
+			machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_4_19;
+		else if (THIS_KERNEL_VERSION >= LINUX(3,7,0))
 			machdep->max_physmem_bits = _MAX_PHYSMEM_BITS_3_7;
 		else
 			machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;