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authorMichael Neuling <mikey@neuling.org>2013-05-29 21:34:29 +0200
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-01 00:29:26 +0200
commit280a5ba22ca35575721d42e536176a3561f4ec43 (patch)
tree1f3d8d44e8fe3fdcd30bd45a0b881a0d878cd7b2 /arch/powerpc/lib/copyuser_power7.S
parentpowerpc/pseries: Kill all prefetch streams on context switch (diff)
downloadlinux-280a5ba22ca35575721d42e536176a3561f4ec43.tar.xz
linux-280a5ba22ca35575721d42e536176a3561f4ec43.zip
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.S12
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