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| author | Michael Ellerman <mpe@ellerman.id.au> | 2018-06-02 14:08:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-06-06 17:44:35 +0300 |
| commit | a1bbe5eb6c01fa47ab7fb2688183fd11ebc3e2bb (patch) | |
| tree | badfb4c8c8576f0579400f3ff08cc34a92a63c85 | |
| parent | 98df74652bfa95856f3ad8cf7b220b01e4a39aaf (diff) | |
| download | linux-a1bbe5eb6c01fa47ab7fb2688183fd11ebc3e2bb.tar.xz | |
powerpc/rfi-flush: Move the logic to avoid a redo into the debugfs code
commit 1e2a9fc7496955faacbbed49461d611b704a7505 upstream.
rfi_flush_enable() includes a check to see if we're already
enabled (or disabled), and in that case does nothing.
But that means calling setup_rfi_flush() a 2nd time doesn't actually
work, which is a bit confusing.
Move that check into the debugfs code, where it really belongs.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/powerpc/kernel/setup_64.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 1746639c4dcd..e6bed89a98ed 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -717,9 +717,6 @@ static void do_nothing(void *unused) void rfi_flush_enable(bool enable) { - if (rfi_flush == enable) - return; - if (enable) { do_rfi_flush_fixups(enabled_flush_types); on_each_cpu(do_nothing, NULL, 1); @@ -773,13 +770,19 @@ void __init setup_rfi_flush(enum l1d_flush_type types, bool enable) #ifdef CONFIG_DEBUG_FS static int rfi_flush_set(void *data, u64 val) { + bool enable; + if (val == 1) - rfi_flush_enable(true); + enable = true; else if (val == 0) - rfi_flush_enable(false); + enable = false; else return -EINVAL; + /* Only do anything if we're changing state */ + if (enable != rfi_flush) + rfi_flush_enable(enable); + return 0; } |