Re: [PATCH] x86/mm: Tear down the direct map when memory hot add fails

[Oscar Salvador (SUSE)]

On Sat, Nov 07, 2026 at 07:00:52PM -0800, Chris Down wrote:
> arch_add_memory() sets up the direct map before calling add_pages().
> If add_pages() fails, the range stays mapped and any page tables
> allocated for it are leaked. A later hot add can reuse the stale
> mapping.
> 
> Remove the direct mapping on failure.
> 
> Fixes: 45e0b78b0532 ("[PATCH] hot-add-mem x86_64: use CONFIG_MEMORY_HOTPLUG_RESERVE")
> Signed-off-by: Chris Down <chris@xxxxxxxxxxxxxx>

Acked-by: Oscar Salvador (SUSE) <osalvador@xxxxxxxxxx>


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Oscar Salvador
SUSE Labs