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dax/fsdev: clear vmemmap_shift when binding static pgmap

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Clear pgmap->vmemmap_shift for static DAX devices. When rebinding a static
device from device_dax (which may set vmemmap_shift based on alignment) to
fsdev_dax, the stale vmemmap_shift persists on the shared pgmap. Explicitly
zero it before devm_memremap_pages() so the vmemmap is built for order-0
folios as fsdev requires.

Fixes: d5406bd458 ("dax: add fsdev.c driver for fs-dax on character dax")

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: John Groves <john@groves.net>
Link: https://patch.msgid.link/0100019ecc090eea-7c46f51e-5393-402c-850d-78059bb6d343-000000@email.amazonses.com
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
This commit is contained in:
John Groves 2026-06-15 16:06:46 +00:00 committed by Alison Schofield
parent e0cb40c3c6
commit e023922993
1 changed files with 1 additions and 0 deletions
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drivers/dax/fsdev.c
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@ -237,6 +237,7 @@ static int fsdev_dax_probe(struct dev_dax *dev_dax)
}
pgmap = dev_dax->pgmap;
pgmap->vmemmap_shift = 0;
} else {
size_t pgmap_size;