diff options
| author | Michael Neuling <mikey@neuling.org> | 2013-05-29 19:34:29 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-06-01 08:29:26 +1000 |
| commit | 280a5ba22ca35575721d42e536176a3561f4ec43 (patch) | |
| tree | 1f3d8d44e8fe3fdcd30bd45a0b881a0d878cd7b2 /arch/powerpc/lib/copyuser_power7.S | |
| parent | a515348fc69fd1d9e8ebd34a16f1026d7fe32048 (diff) | |
powerpc/pseries: Improve stream generation comments in copypage/user
No code changes, just documenting what's happening a little better.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/lib/copyuser_power7.S')
| -rw-r--r-- | arch/powerpc/lib/copyuser_power7.S | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/powerpc/lib/copyuser_power7.S b/arch/powerpc/lib/copyuser_power7.S index 0d24ff15f5f6..d1f11795a7ad 100644 --- a/arch/powerpc/lib/copyuser_power7.S +++ b/arch/powerpc/lib/copyuser_power7.S @@ -318,12 +318,14 @@ err1; stb r0,0(r3) .machine push .machine "power4" - dcbt r0,r6,0b01000 - dcbt r0,r7,0b01010 - dcbtst r0,r9,0b01000 - dcbtst r0,r10,0b01010 + /* setup read stream 0 */ + dcbt r0,r6,0b01000 /* addr from */ + dcbt r0,r7,0b01010 /* length and depth from */ + /* setup write stream 1 */ + dcbtst r0,r9,0b01000 /* addr to */ + dcbtst r0,r10,0b01010 /* length and depth to */ eieio - dcbt r0,r8,0b01010 /* GO */ + dcbt r0,r8,0b01010 /* all streams GO */ .machine pop beq cr1,.Lunwind_stack_nonvmx_copy |