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authorChristophe Leroy <christophe.leroy@csgroup.eu>2020-05-19 05:49:26 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2020-05-26 22:22:23 +1000
commitfcdafd10a363cf3278ce29c6c9a92930380c6cd8 (patch)
tree09bd40daaf027069f0fc1ee5202bd22dd81865aa /arch/powerpc/mm/init_32.c
parentda1adea07576722da4597b0df7d00931f0203229 (diff)
powerpc/8xx: Allow large TLBs with DEBUG_PAGEALLOC
DEBUG_PAGEALLOC only manages RW data. Text and RO data can still be mapped with hugepages and pinned TLB. In order to map with hugepages, also enforce a 512kB data alignment minimum. That's a trade-off between size of speed, taking into account that DEBUG_PAGEALLOC is a debug option. Anyway the alignment is still tunable. We also allow tuning of alignment for book3s to limit the complexity of the test in Kconfig that will anyway disappear in the following patches once DEBUG_PAGEALLOC is handled together with BATs. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c13256f2d356a316715da61fe089b3623ef217a5.1589866984.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm/init_32.c')
-rw-r--r--arch/powerpc/mm/init_32.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index a6991ef8727d..8977a7c2543d 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -96,11 +96,14 @@ static void __init MMU_setup(void)
if (strstr(boot_command_line, "noltlbs")) {
__map_without_ltlbs = 1;
}
+ if (IS_ENABLED(CONFIG_PPC_8xx))
+ return;
+
if (debug_pagealloc_enabled()) {
__map_without_bats = 1;
__map_without_ltlbs = 1;
}
- if (strict_kernel_rwx_enabled() && !IS_ENABLED(CONFIG_PPC_8xx))
+ if (strict_kernel_rwx_enabled())
__map_without_ltlbs = 1;
}