x86/fpu: Remove .fixup usage

Employ EX_TYPE_EFAULT_REG to store '-EFAULT' into the %[err] register
on exception. All the callers only ever test for 0, so the change
from -1 to -EFAULT is immaterial.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20211110101325.604494664@infradead.org

diff --git a/arch/x86/kernel/fpu/legacy.h b/arch/x86/kernel/fpu/legacy.h
index 17c26b1..098f367 100644 (file)
--- a/arch/x86/kernel/fpu/legacy.h
+++ b/arch/x86/kernel/fpu/legacy.h
@@ -35,11 +35,7 @@ static inline void ldmxcsr(u32 mxcsr)
        int err;                                                        \
        asm volatile("1:" #insn "\n\t"                                  \
                     "2:\n"                                             \
-                    ".section .fixup,\"ax\"\n"                         \
-                    "3:  movl $-1,%[err]\n"                            \
-                    "    jmp  2b\n"                                    \
-                    ".previous\n"                                      \
-                    _ASM_EXTABLE(1b, 3b)                               \
+                    _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %[err]) \
                     : [err] "=r" (err), output                         \
                     : "0"(0), input);                                  \
        err;                                                            \

diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h
index 86ea7c0..e0c9264 100644 (file)
--- a/arch/x86/kernel/fpu/xstate.h
+++ b/arch/x86/kernel/fpu/xstate.h
@@ -108,11 +108,7 @@ static inline u64 xfeatures_mask_independent(void)
                     "\n"                                               \
                     "xor %[err], %[err]\n"                             \
                     "3:\n"                                             \
-                    ".pushsection .fixup,\"ax\"\n"                     \
-                    "4: movl $-2, %[err]\n"                            \
-                    "jmp 3b\n"                                         \
-                    ".popsection\n"                                    \
-                    _ASM_EXTABLE(661b, 4b)                             \
+                    _ASM_EXTABLE_TYPE_REG(661b, 3b, EX_TYPE_EFAULT_REG, %[err]) \
                     : [err] "=r" (err)                                 \
                     : "D" (st), "m" (*st), "a" (lmask), "d" (hmask)    \
                     : "memory")