From 74d00a8c3849c1340efd713eb94b786e304c201f Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 25 Dec 2016 20:11:34 +0100 Subject: kernel: split patches folder up into backport, pending and hack folders * properly format/comment all patches * merge debloat patches * merge Kconfig patches * merge swconfig patches * merge hotplug patches * drop 200-fix_localversion.patch - upstream * drop 222-arm_zimage_none.patch - unused * drop 252-mv_cesa_depends.patch - no longer required * drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused * drop 661-fq_codel_keep_dropped_stats.patch - outdated * drop 702-phy_add_aneg_done_function.patch - upstream * drop 840-rtc7301.patch - unused * drop 841-rtc_pt7c4338.patch - upstream * drop 921-use_preinit_as_init.patch - unused * drop spio-gpio-old and gpio-mmc - unused Signed-off-by: John Crispin --- .../generic/pending-4.4/304-mips_disable_fpu.patch | 106 +++++++++++++++++++++ 1 file changed, 106 insertions(+) create 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 new file mode 100644 index 0000000000..a08564dcea --- /dev/null +++ b/target/linux/generic/pending-4.4/304-mips_disable_fpu.patch @@ -0,0 +1,106 @@ +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