mm: hugetlb: independent PMD page table shared count

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/mm.h",
                        "include/linux/mm_types.h",
                        "mm/hugetlb.c"
                    ],
                    "versions": [
                        {
                            "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa",
                            "lessThan": "94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
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                        },
                        {
                            "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa",
                            "lessThan": "2e31443a0d18ae43b9d29e02bf0563f07772193d",
                            "status": "affected",
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                        },
                        {
                            "version": "39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa",
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                            "status": "affected",
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                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/mm.h",
                        "include/linux/mm_types.h",
                        "mm/hugetlb.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.20",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.20",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.239",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.186",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.142",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.72",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.9",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.13",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }