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Subject[PATCH v3 1/6] MIPS: Loongson64: Do not write the read only field LPA of CP0_CONFIG3
Date
The field LPA of CP0_CONFIG3 register is read only for Loongson64, so the
write operations are meaningless, remove them.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---

v2: No changes
v3: No changes

arch/mips/include/asm/mach-loongson64/kernel-entry-init.h | 8 --------
arch/mips/loongson64/numa.c | 3 ---
2 files changed, 11 deletions(-)

diff --git a/arch/mips/include/asm/mach-loongson64/kernel-entry-init.h b/arch/mips/include/asm/mach-loongson64/kernel-entry-init.h
index 87a5bfb..e4d77f4 100644
--- a/arch/mips/include/asm/mach-loongson64/kernel-entry-init.h
+++ b/arch/mips/include/asm/mach-loongson64/kernel-entry-init.h
@@ -19,10 +19,6 @@
.macro kernel_entry_setup
.set push
.set mips64
- /* Set LPA on LOONGSON3 config3 */
- mfc0 t0, CP0_CONFIG3
- or t0, (0x1 << 7)
- mtc0 t0, CP0_CONFIG3
/* Set ELPA on LOONGSON3 pagegrain */
mfc0 t0, CP0_PAGEGRAIN
or t0, (0x1 << 29)
@@ -54,10 +50,6 @@
.macro smp_slave_setup
.set push
.set mips64
- /* Set LPA on LOONGSON3 config3 */
- mfc0 t0, CP0_CONFIG3
- or t0, (0x1 << 7)
- mtc0 t0, CP0_CONFIG3
/* Set ELPA on LOONGSON3 pagegrain */
mfc0 t0, CP0_PAGEGRAIN
or t0, (0x1 << 29)
diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
index cf9459f..c7e3cced 100644
--- a/arch/mips/loongson64/numa.c
+++ b/arch/mips/loongson64/numa.c
@@ -40,9 +40,6 @@ static void enable_lpa(void)
unsigned long value;

value = __read_32bit_c0_register($16, 3);
- value |= 0x00000080;
- __write_32bit_c0_register($16, 3, value);
- value = __read_32bit_c0_register($16, 3);
pr_info("CP0_Config3: CP0 16.3 (0x%lx)\n", value);

value = __read_32bit_c0_register($5, 1);
--
2.1.0
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