diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-07-13 15:05:31 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-07-17 16:42:55 +1000 |
| commit | b275bfb2696387be216db5b7372ee9dcf3f05b80 (patch) | |
| tree | 86e47bb902cc99d0da9273625188cce36989e728 /arch | |
| parent | 912cc87a654d3d30f5da6220489a97a5beb7d313 (diff) | |
powerpc/mm/radix: Add a kernel command line to disable radix
This patch adds the kernel command line disable_radix which disable
the radix MMU mode even if firmware indicates radix support via
ibm,pa-features device tree node.
This helps in testing different MMU mode easily.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 48434be99a07..7a01113d525c 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -646,6 +646,14 @@ static void __init early_reserve_mem(void) #endif } +static bool disable_radix; +static int __init parse_disable_radix(char *p) +{ + disable_radix = true; + return 0; +} +early_param("disable_radix", parse_disable_radix); + void __init early_init_devtree(void *params) { phys_addr_t limit; @@ -735,6 +743,11 @@ void __init early_init_devtree(void *params) */ spinning_secondaries = boot_cpu_count - 1; #endif + /* + * now fixup radix MMU mode based on kernel command line + */ + if (disable_radix) + cur_cpu_spec->mmu_features &= ~MMU_FTR_RADIX; #ifdef CONFIG_PPC_POWERNV /* Scan and build the list of machine check recoverable ranges */ |