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Commit e56c7e18 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
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MIPS: mm: Panic if an XPA kernel is run without RIXI 



XPA kernels hardcode for the presence of RIXI - the PTE format & its
handling presume RI & XI bits. Make this dependence explicit by panicing
if we run on a system that violates it.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Reviewed-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13125/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 4b6f99d3

arch/mips/mm/tlbex.c

+3 −0
Original line number Diff line number Diff line
@@ -2508,6 +2508,9 @@ void build_tlb_refill_handler(void) 
	 */

	static int run_once = 0;



	if (config_enabled(CONFIG_XPA) && !cpu_has_rixi)

		panic("Kernels supporting XPA currently require CPUs with RIXI");



	output_pgtable_bits_defines();

	check_pabits();