MIPS: cpu-probe: Avoid probing FPU when CONFIG_MIPS_FP_SUPPORT=n

When CONFIG_MIPS_FP_SUPPORT=n we don't support floating point so there's
no point in attempting to detect an FPU. Avoid doing so.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/21021/
Cc: linux-mips@linux-mips.org

1 files changed, 41 insertions, 13 deletions

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index d535fc706a8b..71dcef851ca0 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -36,6 +36,8 @@
 unsigned int elf_hwcap __read_mostly;
 EXPORT_SYMBOL_GPL(elf_hwcap);
 
+#ifdef CONFIG_MIPS_FP_SUPPORT
+
 /*
  * Get the FPU Implementation/Revision.
  */
@@ -58,19 +60,6 @@ static inline int __cpu_has_fpu(void)
 	return (cpu_get_fpu_id() & FPIR_IMP_MASK) != FPIR_IMP_NONE;
 }
 
-static inline unsigned long cpu_get_msa_id(void)
-{
-	unsigned long status, msa_id;
-
-	status = read_c0_status();
-	__enable_fpu(FPU_64BIT);
-	enable_msa();
-	msa_id = read_msa_ir();
-	disable_msa();
-	write_c0_status(status);
-	return msa_id;
-}
-
 /*
  * Determine the FCSR mask for FPU hardware.
  */
@@ -326,6 +315,45 @@ static int __init fpu_disable(char *s)
 
 __setup("nofpu", fpu_disable);
 
+#else /* !CONFIG_MIPS_FP_SUPPORT */
+
+#define mips_fpu_disabled 1
+
+static inline unsigned long cpu_get_fpu_id(void)
+{
+	return FPIR_IMP_NONE;
+}
+
+static inline int __cpu_has_fpu(void)
+{
+	return 0;
+}
+
+static void cpu_set_fpu_opts(struct cpuinfo_mips *c)
+{
+	/* no-op */
+}
+
+static void cpu_set_nofpu_opts(struct cpuinfo_mips *c)
+{
+	/* no-op */
+}
+
+#endif /* CONFIG_MIPS_FP_SUPPORT */
+
+static inline unsigned long cpu_get_msa_id(void)
+{
+	unsigned long status, msa_id;
+
+	status = read_c0_status();
+	__enable_fpu(FPU_64BIT);
+	enable_msa();
+	msa_id = read_msa_ir();
+	disable_msa();
+	write_c0_status(status);
+	return msa_id;
+}
+
 static int mips_dsp_disabled;
 
 static int __init dsp_disable(char *s)