Re: [PATCH] mm: huge_memory: don't force huge page alignment on 32 bit

[Matthew Wilcox]

On Thu, Jan 18, 2024 at 10:05:05AM -0800, Yang Shi wrote:
> From: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>
> 
> The commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP
> boundaries") caused two issues [1] [2] reported on 32 bit system or compat
> userspace.
> 
> It doesn't make too much sense to force huge page alignment on 32 bit
> system due to the constrained virtual address space.
> 
> [1] https://lore.kernel.org/linux-mm/d0a136a0-4a31-46bc-adf4-2db109a61672@xxxxxxxxxx/
> [2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@xxxxxxxxxxxxxx/
> 
> Fixes: efa7df3e3bb5 ("mm: align larger anonymous mappings on THP boundaries")
> Reported-by: Jiri Slaby <jirislaby@xxxxxxxxxx>
> Reported-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
> Tested-by: Jiri Slaby <jirislaby@xxxxxxxxxx>
> Tested-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxxx>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Cc: Christopher Lameter <cl@xxxxxxxxx>
> Signed-off-by: Yang Shi <yang@xxxxxxxxxxxxxxxxxxxxxx>

Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>