MIPS: Fix sign-extension bug in 32-bit kernel on 32-bit hardware.

Probably nobody does arithmetic on cp0 register values so this has never
bitten.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index 0ef30c8..32ef8be 100644 (file)
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -728,8 +728,8 @@ do {                                                                        \
                        ".set\tmips64\n\t"                              \
                        "dmfc0\t%M0, " #source "\n\t"                   \
                        "dsll\t%L0, %M0, 32\n\t"                        \
-                       "dsrl\t%M0, %M0, 32\n\t"                        \
-                       "dsrl\t%L0, %L0, 32\n\t"                        \
+                       "dsra\t%M0, %M0, 32\n\t"                        \
+                       "dsra\t%L0, %L0, 32\n\t"                        \
                        ".set\tmips0"                                   \
                        : "=r" (__val));                                \
        else                                                            \
@@ -737,8 +737,8 @@ do {                                                                        \
                        ".set\tmips64\n\t"                              \
                        "dmfc0\t%M0, " #source ", " #sel "\n\t"         \
                        "dsll\t%L0, %M0, 32\n\t"                        \
-                       "dsrl\t%M0, %M0, 32\n\t"                        \
-                       "dsrl\t%L0, %L0, 32\n\t"                        \
+                       "dsra\t%M0, %M0, 32\n\t"                        \
+                       "dsra\t%L0, %L0, 32\n\t"                        \
                        ".set\tmips0"                                   \
                        : "=r" (__val));                                \
        local_irq_restore(__flags);                                     \