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| author |   Nicholas Piggin <npiggin@gmail.com> | 2019-09-03 01:29:30 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-09-05 14:22:41 +1000 |
| commit | 7d805accbec57a151bd0dd305a1109feebdfd4a4 (patch) | |
| tree | 74b29ce6b0e206b947a45f88bd01906b1e201406 /arch/powerpc/mm/book3s64/pgtable.c | |
| parent | powerpc/64s/pseries: radix flush translations before MMU is enabled at boot (diff) | |
| download | linux-dev-7d805accbec57a151bd0dd305a1109feebdfd4a4.tar.xz linux-dev-7d805accbec57a151bd0dd305a1109feebdfd4a4.zip | |
powerpc/64s: remove unnecessary translation cache flushes at boot
The various translation structure invalidations performed in early boot
when the MMU is off are not required, because everything is invalidated
immediately before a CPU first enables its MMU (see early_init_mmu
and early_init_mmu_secondary).
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190902152931.17840-6-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/mm/book3s64/pgtable.c')
| -rw-r--r-- | arch/powerpc/mm/book3s64/pgtable.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 6fab9c0bbbaf..351eb78eed55 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -252,6 +252,11 @@ void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0, pr_info("PATE registered by ultravisor: dw0 = 0x%lx, dw1 = 0x%lx\n", dw0, dw1); } else if (flush) { + /* + * Boot does not need to flush, because MMU is off and each + * CPU does a tlbiel_all() before switching them on, which + * flushes everything. + */ flush_partition(lpid, (old & PATB_HR)); } } |