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MIPS: mm: Panic if an XPA kernel is run without RIXI

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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: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: James 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: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2016-04-19 09:25:11 +01:00 committed by Ralf Baechle
parent 4b6f99d307
commit e56c7e1881
1 changed files with 3 additions and 0 deletions
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3
arch/mips/mm/tlbex.c
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@ -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();