MIPS: Don't compile math-emu when CONFIG_MIPS_FP_SUPPORT=n
When CONFIG_MIPS_FP_SUPPORT=n we don't support floating point, so
there's no point compiling in our FPU emulator. Avoid doing so,
providing stub versions of dsemul cleanup functions that are called from
signal & task handling code.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/21012/
Cc: linux-mips@linux-mips.org
diff --git a/arch/mips/include/asm/dsemul.h b/arch/mips/include/asm/dsemul.h
index b47a975..6d5b781 100644
--- a/arch/mips/include/asm/dsemul.h
+++ b/arch/mips/include/asm/dsemul.h
@@ -52,7 +52,14 @@ extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
*
* Return: True if an emulation frame was returned from, else false.
*/
+#ifdef CONFIG_MIPS_FP_SUPPORT
extern bool do_dsemulret(struct pt_regs *xcp);
+#else
+static inline bool do_dsemulret(struct pt_regs *xcp)
+{
+ return false;
+}
+#endif
/**
* dsemul_thread_cleanup() - Cleanup thread 'emulation' frame
@@ -63,8 +70,14 @@ extern bool do_dsemulret(struct pt_regs *xcp);
*
* Return: True if a frame was freed, else false.
*/
+#ifdef CONFIG_MIPS_FP_SUPPORT
extern bool dsemul_thread_cleanup(struct task_struct *tsk);
-
+#else
+static inline bool dsemul_thread_cleanup(struct task_struct *tsk)
+{
+ return false;
+}
+#endif
/**
* dsemul_thread_rollback() - Rollback from an 'emulation' frame
* @regs: User thread register context.
@@ -77,7 +90,14 @@ extern bool dsemul_thread_cleanup(struct task_struct *tsk);
*
* Return: True if a frame was exited, else false.
*/
+#ifdef CONFIG_MIPS_FP_SUPPORT
extern bool dsemul_thread_rollback(struct pt_regs *regs);
+#else
+static inline bool dsemul_thread_rollback(struct pt_regs *regs)
+{
+ return false;
+}
+#endif
/**
* dsemul_mm_cleanup() - Cleanup per-mm delay slot 'emulation' state
@@ -87,6 +107,13 @@ extern bool dsemul_thread_rollback(struct pt_regs *regs);
* for delay slot 'emulation' book-keeping is freed. This is to be called
* before @mm is freed in order to avoid memory leaks.
*/
+#ifdef CONFIG_MIPS_FP_SUPPORT
extern void dsemul_mm_cleanup(struct mm_struct *mm);
+#else
+static inline void dsemul_mm_cleanup(struct mm_struct *mm)
+{
+ /* no-op */
+}
+#endif
#endif /* __MIPS_ASM_DSEMUL_H__ */