arch/tile: add some more VMSPLIT options and use consistent naming

This renames 3G_OPT to 2_75G, and adds 2_5G and 2_25G.

For memory-intensive applications that are also network-buffer
intensive it can be helpful to be able to tune the virtual address
of the start of kernel memory.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 92f7ea0..eed0fc5 100644 (file)
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -234,8 +234,12 @@ choice
                bool "3.5G/0.5G user/kernel split"
        config VMSPLIT_3G
                bool "3G/1G user/kernel split"
-       config VMSPLIT_3G_OPT
-               bool "3G/1G user/kernel split (for full 1G low memory)"
+       config VMSPLIT_2_75G
+               bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
+       config VMSPLIT_2_5G
+               bool "2.5G/1.5G user/kernel split"
+       config VMSPLIT_2_25G
+               bool "2.25G/1.75G user/kernel split"
        config VMSPLIT_2G
                bool "2G/2G user/kernel split"
        config VMSPLIT_1G
@@ -246,7 +250,9 @@ config PAGE_OFFSET
        hex
        default 0xF0000000 if VMSPLIT_3_75G
        default 0xE0000000 if VMSPLIT_3_5G
-       default 0xB0000000 if VMSPLIT_3G_OPT
+       default 0xB0000000 if VMSPLIT_2_75G
+       default 0xA0000000 if VMSPLIT_2_5G
+       default 0x90000000 if VMSPLIT_2_25G
        default 0x80000000 if VMSPLIT_2G
        default 0x40000000 if VMSPLIT_1G
        default 0xC0000000