Commit 3c229b3f authored Oct 12, 2018 by Helge Deller

parisc: Fix map_pages() to not overwrite existing pte entries



Fix a long-existing small nasty bug in the map_pages() implementation which
leads to overwriting already written pte entries with zero, *if* map_pages() is
called a second time with an end address which isn't aligned on a pmd boundry.
This happens for example if we want to remap only the text segment read/write
in order to run alternative patching on the code. Exiting the loop when we
reach the end address fixes this.

Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>

parent 4dd5b673

arch/parisc/mm/init.c

+2 −6

Original line number	Diff line number	Diff line
		@@ -494,12 +494,8 @@ static void __init map_pages(unsigned long start_vaddr,
		pte = pte_mkhuge(pte);
		}

		if (address >= end_paddr) {
		if (force)
		if (address >= end_paddr)
		break;
		else
		pte_val(pte) = 0;
		}

		set_pte(pg_table, pte);