From c3bdb89e61084278a598d5af15da274cada1ecc6 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 4 Jul 2018 19:41:26 +0200 Subject: kernel: remove linux 4.4 support Signed-off-by: Felix Fietkau --- .../generic/pending-4.4/304-mips_disable_fpu.patch | 106 --------------------- 1 file changed, 106 deletions(-) delete mode 100644 target/linux/generic/pending-4.4/304-mips_disable_fpu.patch (limited to 'target/linux/generic/pending-4.4/304-mips_disable_fpu.patch') diff --git a/target/linux/generic/pending-4.4/304-mips_disable_fpu.patch b/target/linux/generic/pending-4.4/304-mips_disable_fpu.patch deleted file mode 100644 index a08564dcea..0000000000 --- a/target/linux/generic/pending-4.4/304-mips_disable_fpu.patch +++ /dev/null @@ -1,106 +0,0 @@ -From: Manuel Lauss -Subject: [RFC PATCH v4 2/2] MIPS: make FPU emulator optional -Date: Mon, 7 Apr 2014 12:57:04 +0200 -Message-Id: <1396868224-252888-2-git-send-email-manuel.lauss@gmail.com> - -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 ---- -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 -@@ -2725,6 +2725,20 @@ 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 -@@ -285,7 +285,7 @@ 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 -@@ -223,8 +223,10 @@ 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 - #include - -+#ifdef CONFIG_MIPS_FPU_EMULATOR - #ifdef CONFIG_DEBUG_FS - - struct mips_fpu_emulator_stats { -@@ -66,6 +67,21 @@ extern int do_dsemulret(struct pt_regs * - 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 do_dsemulret(struct pt_regs *xcp) -+{ -+ return 0; /* 0 means error, should never get here anyway */ -+} -+ -+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 */ -+ - int process_fpemu_return(int sig, void __user *fault_addr, - unsigned long fcr31); - int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, -- cgit v1.2.3