kernel: remove support for kernel 4.9

[openwrt/staging/dedeckeh.git] / target / linux / generic / pending-4.9 / 304-mips_disable_fpu.patch

diff --git a/target/linux/generic/pending-4.9/304-mips_disable_fpu.patch b/target/linux/generic/pending-4.9/304-mips_disable_fpu.patch
deleted file mode 100644 (file)
index b59b9fe..0000000
--- a/target/linux/generic/pending-4.9/304-mips_disable_fpu.patch
+++ /dev/null
@@ -1,137 +0,0 @@
-From:   Manuel Lauss <manuel.lauss@gmail.com>
-Subject: [RFC PATCH v4 2/2] MIPS: make FPU emulator optional
-
-This small patch makes the MIPS FPU emulator optional. The kernel
-kills float-users on systems without a hardware FPU by sending a SIGILL.
-
-Disabling the emulator shrinks vmlinux by about 54kBytes (32bit,
-optimizing for size).
-
-Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
----
-v4: rediffed because of patch 1/2, should now work with micromips as well
-v3: updated patch description with size savings.
-v2: incorporated changes suggested by Jonas Gorski
-    force the fpu emulator on for micromips: relocating the parts
-    of the mmips code in the emulator to other areas would be a
-    much larger change; I went the cheap route instead with this.
-
- arch/mips/Kbuild                     |  2 +-
- arch/mips/Kconfig                    | 14 ++++++++++++++
- arch/mips/include/asm/fpu.h          |  5 +++--
- arch/mips/include/asm/fpu_emulator.h | 15 +++++++++++++++
- 4 files changed, 33 insertions(+), 3 deletions(-)
-
---- a/arch/mips/Kconfig
-+++ b/arch/mips/Kconfig
-@@ -2890,6 +2890,20 @@ config MIPS_O32_FP64_SUPPORT
- 
-         If unsure, say N.
- 
-+config MIPS_FPU_EMULATOR
-+      bool "MIPS FPU Emulator"
-+      default y
-+      help
-+        This option lets you disable the built-in MIPS FPU (Coprocessor 1)
-+        emulator, which handles floating-point instructions on processors
-+        without a hardware FPU.  It is generally a good idea to keep the
-+        emulator built-in, unless you are perfectly sure you have a
-+        complete soft-float environment.  With the emulator disabled, all
-+        users of float operations will be killed with an illegal instr-
-+        uction exception.
-+
-+        Say Y, please.
-+
- config USE_OF
-       bool
-       select OF
---- a/arch/mips/Makefile
-+++ b/arch/mips/Makefile
-@@ -287,7 +287,7 @@ OBJCOPYFLAGS               += --remove-section=.regin
- head-y := arch/mips/kernel/head.o
- 
- libs-y                        += arch/mips/lib/
--libs-y                        += arch/mips/math-emu/
-+libs-$(CONFIG_MIPS_FPU_EMULATOR)      += arch/mips/math-emu/
- 
- # See arch/mips/Kbuild for content of core part of the kernel
- core-y += arch/mips/
---- a/arch/mips/include/asm/fpu.h
-+++ b/arch/mips/include/asm/fpu.h
-@@ -227,8 +227,10 @@ static inline int init_fpu(void)
-               /* Restore FRE */
-               write_c0_config5(config5);
-               enable_fpu_hazard();
--      } else
-+      } else if (IS_ENABLED(CONFIG_MIPS_FPU_EMULATOR))
-               fpu_emulator_init_fpu();
-+      else
-+              ret = SIGILL;
- 
-       return ret;
- }
---- a/arch/mips/include/asm/fpu_emulator.h
-+++ b/arch/mips/include/asm/fpu_emulator.h
-@@ -30,6 +30,7 @@
- #include <asm/local.h>
- #include <asm/processor.h>
- 
-+#ifdef CONFIG_MIPS_FPU_EMULATOR
- #ifdef CONFIG_DEBUG_FS
- 
- struct mips_fpu_emulator_stats {
-@@ -63,6 +64,16 @@ do {                                                                        \
- extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
-                                   struct mips_fpu_struct *ctx, int has_fpu,
-                                   void *__user *fault_addr);
-+#else /* no CONFIG_MIPS_FPU_EMULATOR */
-+static inline int fpu_emulator_cop1Handler(struct pt_regs *xcp,
-+                              struct mips_fpu_struct *ctx, int has_fpu,
-+                              void *__user *fault_addr)
-+{
-+      *fault_addr = NULL;
-+      return SIGILL;  /* we don't speak MIPS FPU */
-+}
-+#endif        /* CONFIG_MIPS_FPU_EMULATOR */
-+
- void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
-                    struct task_struct *tsk);
- int process_fpemu_return(int sig, void __user *fault_addr,
---- a/arch/mips/include/asm/dsemul.h
-+++ b/arch/mips/include/asm/dsemul.h
-@@ -41,6 +41,7 @@ struct task_struct;
- extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
-                      unsigned long branch_pc, unsigned long cont_pc);
- 
-+#ifdef CONFIG_MIPS_FPU_EMULATOR
- /**
-  * do_dsemulret() - Return from a delay slot 'emulation' frame
-  * @xcp:      User thread register context.
-@@ -88,5 +89,27 @@ extern bool dsemul_thread_rollback(struc
-  * before @mm is freed in order to avoid memory leaks.
-  */
- extern void dsemul_mm_cleanup(struct mm_struct *mm);
-+#else
-+static inline bool do_dsemulret(struct pt_regs *xcp)
-+{
-+      return false;
-+}
-+
-+static inline bool dsemul_thread_cleanup(struct task_struct *tsk)
-+{
-+      return false;
-+}
-+
-+static inline bool dsemul_thread_rollback(struct pt_regs *regs)
-+{
-+      return false;
-+}
-+
-+static inline void dsemul_mm_cleanup(struct mm_struct *mm)
-+{
-+
-+}
-+
-+#endif
- 
- #endif /* __MIPS_ASM_DSEMUL_H__ */