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| author | Nicholas Piggin | 2018-07-05 10:47:00 +0200 |
|---|---|---|
| committer | Michael Ellerman | 2018-07-16 03:37:21 +0200 |
| commit | 2bf1071a8d50928a4ae366bb3108833166c2b70c (patch) | |
| tree | ebffef07f7ebbb9bb1ba231c4cb8ff00cc6fd795 /arch/powerpc/kernel/process.c | |
| parent | Linux 4.18-rc1 (diff) | |
| download | kernel-qcow2-linux-2bf1071a8d50928a4ae366bb3108833166c2b70c.tar.gz kernel-qcow2-linux-2bf1071a8d50928a4ae366bb3108833166c2b70c.tar.xz kernel-qcow2-linux-2bf1071a8d50928a4ae366bb3108833166c2b70c.zip | |
powerpc/64s: Remove POWER9 DD1 support
POWER9 DD1 was never a product. It is no longer supported by upstream
firmware, and it is not effectively supported in Linux due to lack of
testing.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
[mpe: Remove arch_make_huge_pte() entirely]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 9ef4aea9fffe..27f0caee55ea 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1250,17 +1250,9 @@ struct task_struct *__switch_to(struct task_struct *prev, * mappings. If the new process has the foreign real address * mappings, we must issue a cp_abort to clear any state and * prevent snooping, corruption or a covert channel. - * - * DD1 allows paste into normal system memory so we do an - * unpaired copy, rather than cp_abort, to clear the buffer, - * since cp_abort is quite expensive. */ - if (current_thread_info()->task->thread.used_vas) { + if (current_thread_info()->task->thread.used_vas) asm volatile(PPC_CP_ABORT); - } else if (cpu_has_feature(CPU_FTR_POWER9_DD1)) { - asm volatile(PPC_COPY(%0, %1) - : : "r"(dummy_copy_buffer), "r"(0)); - } } #endif /* CONFIG_PPC_BOOK3S_64 */ |