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b=ftIouGIbjylri8Kvfke8oEPPfNhoHjEMCy1g0bISWEG95ICf/t2wZYfadI4Vn9gAm 5JcSDQpIvloVh9UoBjK+2vKo5jZSo+HOUc1qtgOL37dKIFzo5fNEy7IBw+VsKTfxVH l6Wc8vfUY0cr8XxjqYvUxdbg3D5gpQuEK/OVOk0hEiVAJ4bs1/4ykdtgjAnHwgsYYW e9v6Gv5EmZGsZI/Ne0ahYegl8UcojPMQ7fwgbF0WWEzeDnqdgoIaM9T87b/K/Yc/O2 0Y+GHaYEZrhHQHXzsWbwvUJSoAtDW13+NDNiMpjcIZahgK7Er5iOfQyFtHcwix3Zu6 xfXlbau9hhrGw== From: Mike Rapoport To: linux-mm@kvack.org Cc: Andrew Morton , David Hildenbrand , Mike Rapoport , Taku Izumi , Wei Yang , Yuan Liu , linux-kernel@vger.kernel.org Subject: [PATCH 1/2] mm/mm_init: don't overlap NORMAL and MOVABLE zones with kernelcore=mirror Date: Thu, 25 Jun 2026 10:39:39 +0300 Message-ID: <20260625073941.145014-2-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260625073941.145014-1-rppt@kernel.org> References: <20260625073941.145014-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: CA69B4000D X-Stat-Signature: wpbiyeqemf6upx54ayc4o9csmptodp6j X-HE-Tag: 1782373191-262899 X-HE-Meta: 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 mbpEMyOT 8KP8qZ7Fccqm7fBoeSNa0fbW77Z2uZHBx/pXBf6Nkr6cZ+IXDXyMfbRFS40o8J/O1V1jEvaoenlI6L8leZRK8A469r3+WWIaujM6UfB2Kwy1+oddIUNdN8Dvdimz8OHQxSpUYvCkocCTJOVbBq1pgrbo9DYNaTp915ihPLHOKFVRq3dFSLzNCcDB3M8fdEWCK9cipCahJahSQGj8yOEQJOMSZGPRbw0G9cClYwoazRFG5mFFiNsyW+x2+++tmk8rVTW3D+o/xUixvk9ZQdg5ZblWkbKzaTwRhYcw6vJj0o/8W1XrRUmRSq2VwTMxyEeS88lB/BxMz/rRYS+DKPNfZwm8MTfeCmtpGUQXEZp5Qu5xNHknsP41Q7GNzDZKytisUaX81 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: "Mike Rapoport (Microsoft)" When kernelcore or movablecore kernel parameters define size of the NORMAL and MOVABLE zones as percents of the total memory or by absolute value, ZONE_NORMAL is clamped at the beginning of ZONE_MOVABLE. However, when kernelcore=mirror the ZONE_NORMAL span is not changed but rather pages from ZONE_MOVABLE counted as absent in ZONE_NORMAL. Make the behaviour of kernelcore= parameter uniform and treat mirror just as another way to size the zones. Co-developed-by: Wei Yang Signed-off-by: Wei Yang Signed-off-by: Mike Rapoport (Microsoft) --- mm/mm_init.c | 36 +++--------------------------------- 1 file changed, 3 insertions(+), 33 deletions(-) diff --git a/mm/mm_init.c b/mm/mm_init.c index f9f8e1af921c..dce9dc9f2302 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1159,9 +1159,8 @@ static void __init adjust_zone_range_for_zone_movable(int nid, arch_zone_highest_possible_pfn[movable_zone]); /* Adjust for ZONE_MOVABLE starting within this range */ - } else if (!mirrored_kernelcore && - *zone_start_pfn < zone_movable_pfn[nid] && - *zone_end_pfn > zone_movable_pfn[nid]) { + } else if (*zone_start_pfn < zone_movable_pfn[nid] && + *zone_end_pfn > zone_movable_pfn[nid]) { *zone_end_pfn = zone_movable_pfn[nid]; /* Check if this whole range is within ZONE_MOVABLE */ @@ -1209,40 +1208,11 @@ static unsigned long __init zone_absent_pages_in_node(int nid, unsigned long zone_start_pfn, unsigned long zone_end_pfn) { - unsigned long nr_absent; - /* zone is empty, we don't have any absent pages */ if (zone_start_pfn == zone_end_pfn) return 0; - nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); - - /* - * ZONE_MOVABLE handling. - * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages - * and vice versa. - */ - if (mirrored_kernelcore && zone_movable_pfn[nid]) { - unsigned long start_pfn, end_pfn; - struct memblock_region *r; - - for_each_mem_region(r) { - start_pfn = clamp(memblock_region_memory_base_pfn(r), - zone_start_pfn, zone_end_pfn); - end_pfn = clamp(memblock_region_memory_end_pfn(r), - zone_start_pfn, zone_end_pfn); - - if (zone_type == ZONE_MOVABLE && - memblock_is_mirror(r)) - nr_absent += end_pfn - start_pfn; - - if (zone_type == ZONE_NORMAL && - !memblock_is_mirror(r)) - nr_absent += end_pfn - start_pfn; - } - } - - return nr_absent; + return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); } /* -- 2.53.0