kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/powerpc/include/asm/book3s/64/radix-64k.h
..
..
@@ -5,10 +5,10 @@
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 /*
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  * For 64K page size supported index is 13/9/9/5
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  */
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-#define RADIX_PTE_INDEX_SIZE  5  /* 2MB huge page */
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-#define RADIX_PMD_INDEX_SIZE  9  /* 1G huge page */
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-#define RADIX_PUD_INDEX_SIZE	 9
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-#define RADIX_PGD_INDEX_SIZE  13
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+#define RADIX_PTE_INDEX_SIZE   5  // size: 8B <<  5 = 256B, maps 2^5  x   64K =   2MB
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+#define RADIX_PMD_INDEX_SIZE   9  // size: 8B <<  9 =  4KB, maps 2^9  x   2MB =   1GB
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+#define RADIX_PUD_INDEX_SIZE   9  // size: 8B <<  9 =  4KB, maps 2^9  x   1GB = 512GB
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+#define RADIX_PGD_INDEX_SIZE  13  // size: 8B << 13 = 64KB, maps 2^13 x 512GB =   4PB
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 /*
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  * We use a 256 byte PTE page fragment in radix