On Sun, Jan 04, 2026 at 02:01:40PM +0200, Mike Rapoport wrote: > From 35d016bbf5da7c08cc5c5547c85558fc50cb63aa Mon Sep 17 00:00:00 2001 > From: Klara Modin <[email protected]> > Date: Sat, 3 Jan 2026 20:40:09 +0200 > Subject: [PATCH] arm: make initialization of zero page independent of the > memory map > > Unlike most architectures, arm keeps a struct page pointer to the > empty_zero_page and to initialize it requires conversion of a virtual > address to page which makes it necessary to have memory map initialized > before creating the empty_zero_page. > > Make empty_zero_page a stataic array in BSS to decouple it's > initialization from the initialization of the memory map.
I see you haven't considered _why_ ARM does this. You are getting rid of the flush_dcache_page() call, which ensures that the zeroed contents of the page are pushed out of the cache into memory. This is necessary. BSS is very similar. It's memset() during the kernel boot _after_ the caches are enabled. Without an explicit flush, nothing guarantees that those writes will be visible to userspace. To me, this seems like a bad idea, which will cause userspace to break. We need to call flush_dcache_page(), and _that_ requires a struct page. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
