diff --git a/libc/bionic/exec.cpp b/libc/bionic/exec.cpp
index 3309585..fd2c401 100644
--- a/libc/bionic/exec.cpp
+++ b/libc/bionic/exec.cpp
@@ -44,9 +44,10 @@
 
 extern "C" char** environ;
 
-enum ExecVariant { kIsExecL, kIsExecLE, kIsExecLP };
+enum { ExecL, ExecLE, ExecLP };
 
-static int __execl(const char* name, const char* argv0, ExecVariant variant, va_list ap) {
+template <int variant>
+static int __execl(const char* name, const char* argv0, va_list ap) {
   // Count the arguments.
   va_list count_ap;
   va_copy(count_ap, ap);
@@ -65,17 +66,17 @@
   }
 
   // Collect the argp too.
-  char** argp = (variant == kIsExecLE) ? va_arg(ap, char**) : environ;
+  char** argp = (variant == ExecLE) ? va_arg(ap, char**) : environ;
 
   va_end(ap);
 
-  return (variant == kIsExecLP) ? execvp(name, argv) : execve(name, argv, argp);
+  return (variant == ExecLP) ? execvp(name, argv) : execve(name, argv, argp);
 }
 
 int execl(const char* name, const char* arg, ...) {
   va_list ap;
   va_start(ap, arg);
-  int result = __execl(name, arg, kIsExecL, ap);
+  int result = __execl<ExecL>(name, arg, ap);
   va_end(ap);
   return result;
 }
@@ -83,7 +84,7 @@
 int execle(const char* name, const char* arg, ...) {
   va_list ap;
   va_start(ap, arg);
-  int result = __execl(name, arg, kIsExecLE, ap);
+  int result = __execl<ExecLE>(name, arg, ap);
   va_end(ap);
   return result;
 }
@@ -91,7 +92,7 @@
 int execlp(const char* name, const char* arg, ...) {
   va_list ap;
   va_start(ap, arg);
-  int result = __execl(name, arg, kIsExecLP, ap);
+  int result = __execl<ExecLP>(name, arg, ap);
   va_end(ap);
   return result;
 }
diff --git a/libc/kernel/tools/generate_uapi_headers.sh b/libc/kernel/tools/generate_uapi_headers.sh
index fde4a3d..4e7d2af 100755
--- a/libc/kernel/tools/generate_uapi_headers.sh
+++ b/libc/kernel/tools/generate_uapi_headers.sh
@@ -264,11 +264,6 @@
                  "${ANDROID_KERNEL_DIR}/uapi/asm-${arch}/asm"
 done
 
-# The arm kvm.h uapi header was removed from arch so copy it from the
-# tools/arch directory.
-cp "${KERNEL_DIR}/tools/arch/arm/include/uapi/asm/kvm.h" \
-   "${ANDROID_KERNEL_DIR}/uapi/asm-arm/asm"
-
 # Verify if modified headers have changed.
 verify_modified_hdrs "${KERNEL_DIR}/include/scsi" \
                      "${ANDROID_KERNEL_DIR}/scsi" \
diff --git a/libc/kernel/uapi/asm-arm/asm/kvm.h b/libc/kernel/uapi/asm-arm/asm/kvm.h
deleted file mode 100644
index 6a6d963..0000000
--- a/libc/kernel/uapi/asm-arm/asm/kvm.h
+++ /dev/null
@@ -1,216 +0,0 @@
-/****************************************************************************
- ****************************************************************************
- ***
- ***   This header was automatically generated from a Linux kernel header
- ***   of the same name, to make information necessary for userspace to
- ***   call into the kernel available to libc.  It contains only constants,
- ***   structures, and macros generated from the original header, and thus,
- ***   contains no copyrightable information.
- ***
- ***   To edit the content of this header, modify the corresponding
- ***   source file (e.g. under external/kernel-headers/original/) then
- ***   run bionic/libc/kernel/tools/update_all.py
- ***
- ***   Any manual change here will be lost the next time this script will
- ***   be run. You've been warned!
- ***
- ****************************************************************************
- ****************************************************************************/
-#ifndef __ARM_KVM_H__
-#define __ARM_KVM_H__
-#include <linux/types.h>
-#include <linux/psci.h>
-#include <asm/ptrace.h>
-#define __KVM_HAVE_GUEST_DEBUG
-#define __KVM_HAVE_IRQ_LINE
-#define __KVM_HAVE_READONLY_MEM
-#define __KVM_HAVE_VCPU_EVENTS
-#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
-#define KVM_REG_SIZE(id) (1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))
-#define KVM_ARM_SVC_sp svc_regs[0]
-#define KVM_ARM_SVC_lr svc_regs[1]
-#define KVM_ARM_SVC_spsr svc_regs[2]
-#define KVM_ARM_ABT_sp abt_regs[0]
-#define KVM_ARM_ABT_lr abt_regs[1]
-#define KVM_ARM_ABT_spsr abt_regs[2]
-#define KVM_ARM_UND_sp und_regs[0]
-#define KVM_ARM_UND_lr und_regs[1]
-#define KVM_ARM_UND_spsr und_regs[2]
-#define KVM_ARM_IRQ_sp irq_regs[0]
-#define KVM_ARM_IRQ_lr irq_regs[1]
-#define KVM_ARM_IRQ_spsr irq_regs[2]
-#define KVM_ARM_FIQ_r8 fiq_regs[0]
-#define KVM_ARM_FIQ_r9 fiq_regs[1]
-#define KVM_ARM_FIQ_r10 fiq_regs[2]
-#define KVM_ARM_FIQ_fp fiq_regs[3]
-#define KVM_ARM_FIQ_ip fiq_regs[4]
-#define KVM_ARM_FIQ_sp fiq_regs[5]
-#define KVM_ARM_FIQ_lr fiq_regs[6]
-#define KVM_ARM_FIQ_spsr fiq_regs[7]
-struct kvm_regs {
-  struct pt_regs usr_regs;
-  unsigned long svc_regs[3];
-  unsigned long abt_regs[3];
-  unsigned long und_regs[3];
-  unsigned long irq_regs[3];
-  unsigned long fiq_regs[8];
-};
-#define KVM_ARM_TARGET_CORTEX_A15 0
-#define KVM_ARM_TARGET_CORTEX_A7 1
-#define KVM_ARM_NUM_TARGETS 2
-#define KVM_ARM_DEVICE_TYPE_SHIFT 0
-#define KVM_ARM_DEVICE_TYPE_MASK (0xffff << KVM_ARM_DEVICE_TYPE_SHIFT)
-#define KVM_ARM_DEVICE_ID_SHIFT 16
-#define KVM_ARM_DEVICE_ID_MASK (0xffff << KVM_ARM_DEVICE_ID_SHIFT)
-#define KVM_ARM_DEVICE_VGIC_V2 0
-#define KVM_VGIC_V2_ADDR_TYPE_DIST 0
-#define KVM_VGIC_V2_ADDR_TYPE_CPU 1
-#define KVM_VGIC_V2_DIST_SIZE 0x1000
-#define KVM_VGIC_V2_CPU_SIZE 0x2000
-#define KVM_VGIC_V3_ADDR_TYPE_DIST 2
-#define KVM_VGIC_V3_ADDR_TYPE_REDIST 3
-#define KVM_VGIC_ITS_ADDR_TYPE 4
-#define KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION 5
-#define KVM_VGIC_V3_DIST_SIZE SZ_64K
-#define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K)
-#define KVM_VGIC_V3_ITS_SIZE (2 * SZ_64K)
-#define KVM_ARM_VCPU_POWER_OFF 0
-#define KVM_ARM_VCPU_PSCI_0_2 1
-struct kvm_vcpu_init {
-  __u32 target;
-  __u32 features[7];
-};
-struct kvm_sregs {
-};
-struct kvm_fpu {
-};
-struct kvm_guest_debug_arch {
-};
-struct kvm_debug_exit_arch {
-};
-struct kvm_sync_regs {
-  __u64 device_irq_level;
-};
-struct kvm_arch_memory_slot {
-};
-struct kvm_vcpu_events {
-  struct {
-    __u8 serror_pending;
-    __u8 serror_has_esr;
-    __u8 ext_dabt_pending;
-    __u8 pad[5];
-    __u64 serror_esr;
-  } exception;
-  __u32 reserved[12];
-};
-#define KVM_REG_ARM_COPROC_MASK 0x000000000FFF0000
-#define KVM_REG_ARM_COPROC_SHIFT 16
-#define KVM_REG_ARM_32_OPC2_MASK 0x0000000000000007
-#define KVM_REG_ARM_32_OPC2_SHIFT 0
-#define KVM_REG_ARM_OPC1_MASK 0x0000000000000078
-#define KVM_REG_ARM_OPC1_SHIFT 3
-#define KVM_REG_ARM_CRM_MASK 0x0000000000000780
-#define KVM_REG_ARM_CRM_SHIFT 7
-#define KVM_REG_ARM_32_CRN_MASK 0x0000000000007800
-#define KVM_REG_ARM_32_CRN_SHIFT 11
-#define KVM_REG_ARM_SECURE_MASK 0x0000000010000000
-#define KVM_REG_ARM_SECURE_SHIFT 28
-#define ARM_CP15_REG_SHIFT_MASK(x,n) (((x) << KVM_REG_ARM_ ##n ##_SHIFT) & KVM_REG_ARM_ ##n ##_MASK)
-#define __ARM_CP15_REG(op1,crn,crm,op2) (KVM_REG_ARM | (15 << KVM_REG_ARM_COPROC_SHIFT) | ARM_CP15_REG_SHIFT_MASK(op1, OPC1) | ARM_CP15_REG_SHIFT_MASK(crn, 32_CRN) | ARM_CP15_REG_SHIFT_MASK(crm, CRM) | ARM_CP15_REG_SHIFT_MASK(op2, 32_OPC2))
-#define ARM_CP15_REG32(...) (__ARM_CP15_REG(__VA_ARGS__) | KVM_REG_SIZE_U32)
-#define __ARM_CP15_REG64(op1,crm) (__ARM_CP15_REG(op1, 0, crm, 0) | KVM_REG_SIZE_U64)
-#define ARM_CP15_REG64(...) __ARM_CP15_REG64(__VA_ARGS__)
-#define KVM_REG_ARM_PTIMER_CTL ARM_CP15_REG32(0, 14, 2, 1)
-#define KVM_REG_ARM_PTIMER_CNT ARM_CP15_REG64(0, 14)
-#define KVM_REG_ARM_PTIMER_CVAL ARM_CP15_REG64(2, 14)
-#define KVM_REG_ARM_TIMER_CTL ARM_CP15_REG32(0, 14, 3, 1)
-#define KVM_REG_ARM_TIMER_CNT ARM_CP15_REG64(1, 14)
-#define KVM_REG_ARM_TIMER_CVAL ARM_CP15_REG64(3, 14)
-#define KVM_REG_ARM_CORE (0x0010 << KVM_REG_ARM_COPROC_SHIFT)
-#define KVM_REG_ARM_CORE_REG(name) (offsetof(struct kvm_regs, name) / 4)
-#define KVM_REG_ARM_DEMUX (0x0011 << KVM_REG_ARM_COPROC_SHIFT)
-#define KVM_REG_ARM_DEMUX_ID_MASK 0x000000000000FF00
-#define KVM_REG_ARM_DEMUX_ID_SHIFT 8
-#define KVM_REG_ARM_DEMUX_ID_CCSIDR (0x00 << KVM_REG_ARM_DEMUX_ID_SHIFT)
-#define KVM_REG_ARM_DEMUX_VAL_MASK 0x00000000000000FF
-#define KVM_REG_ARM_DEMUX_VAL_SHIFT 0
-#define KVM_REG_ARM_VFP (0x0012 << KVM_REG_ARM_COPROC_SHIFT)
-#define KVM_REG_ARM_VFP_MASK 0x000000000000FFFF
-#define KVM_REG_ARM_VFP_BASE_REG 0x0
-#define KVM_REG_ARM_VFP_FPSID 0x1000
-#define KVM_REG_ARM_VFP_FPSCR 0x1001
-#define KVM_REG_ARM_VFP_MVFR1 0x1006
-#define KVM_REG_ARM_VFP_MVFR0 0x1007
-#define KVM_REG_ARM_VFP_FPEXC 0x1008
-#define KVM_REG_ARM_VFP_FPINST 0x1009
-#define KVM_REG_ARM_VFP_FPINST2 0x100A
-#define KVM_REG_ARM_FW (0x0014 << KVM_REG_ARM_COPROC_SHIFT)
-#define KVM_REG_ARM_FW_REG(r) (KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_FW | ((r) & 0xffff))
-#define KVM_REG_ARM_PSCI_VERSION KVM_REG_ARM_FW_REG(0)
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1 KVM_REG_ARM_FW_REG(1)
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL 0
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL 1
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED 2
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2 KVM_REG_ARM_FW_REG(2)
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL 0
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN 1
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL 2
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED 3
-#define KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED (1U << 4)
-#define KVM_DEV_ARM_VGIC_GRP_ADDR 0
-#define KVM_DEV_ARM_VGIC_GRP_DIST_REGS 1
-#define KVM_DEV_ARM_VGIC_GRP_CPU_REGS 2
-#define KVM_DEV_ARM_VGIC_CPUID_SHIFT 32
-#define KVM_DEV_ARM_VGIC_CPUID_MASK (0xffULL << KVM_DEV_ARM_VGIC_CPUID_SHIFT)
-#define KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT 32
-#define KVM_DEV_ARM_VGIC_V3_MPIDR_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT)
-#define KVM_DEV_ARM_VGIC_OFFSET_SHIFT 0
-#define KVM_DEV_ARM_VGIC_OFFSET_MASK (0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
-#define KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK (0xffff)
-#define KVM_DEV_ARM_VGIC_GRP_NR_IRQS 3
-#define KVM_DEV_ARM_VGIC_GRP_CTRL 4
-#define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
-#define KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS 6
-#define KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO 7
-#define KVM_DEV_ARM_VGIC_GRP_ITS_REGS 8
-#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT 10
-#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK (0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
-#define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff
-#define VGIC_LEVEL_INFO_LINE_LEVEL 0
-#define KVM_ARM_VCPU_PMU_V3_CTRL 0
-#define KVM_ARM_VCPU_PMU_V3_IRQ 0
-#define KVM_ARM_VCPU_PMU_V3_INIT 1
-#define KVM_ARM_VCPU_TIMER_CTRL 1
-#define KVM_ARM_VCPU_TIMER_IRQ_VTIMER 0
-#define KVM_ARM_VCPU_TIMER_IRQ_PTIMER 1
-#define KVM_DEV_ARM_VGIC_CTRL_INIT 0
-#define KVM_DEV_ARM_ITS_SAVE_TABLES 1
-#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2
-#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3
-#define KVM_DEV_ARM_ITS_CTRL_RESET 4
-#define KVM_ARM_IRQ_VCPU2_SHIFT 28
-#define KVM_ARM_IRQ_VCPU2_MASK 0xf
-#define KVM_ARM_IRQ_TYPE_SHIFT 24
-#define KVM_ARM_IRQ_TYPE_MASK 0xf
-#define KVM_ARM_IRQ_VCPU_SHIFT 16
-#define KVM_ARM_IRQ_VCPU_MASK 0xff
-#define KVM_ARM_IRQ_NUM_SHIFT 0
-#define KVM_ARM_IRQ_NUM_MASK 0xffff
-#define KVM_ARM_IRQ_TYPE_CPU 0
-#define KVM_ARM_IRQ_TYPE_SPI 1
-#define KVM_ARM_IRQ_TYPE_PPI 2
-#define KVM_ARM_IRQ_CPU_IRQ 0
-#define KVM_ARM_IRQ_CPU_FIQ 1
-#define KVM_ARM_IRQ_GIC_MAX 127
-#define KVM_NR_IRQCHIPS 1
-#define KVM_PSCI_FN_BASE 0x95c1ba5e
-#define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n))
-#define KVM_PSCI_FN_CPU_SUSPEND KVM_PSCI_FN(0)
-#define KVM_PSCI_FN_CPU_OFF KVM_PSCI_FN(1)
-#define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2)
-#define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3)
-#define KVM_PSCI_RET_SUCCESS PSCI_RET_SUCCESS
-#define KVM_PSCI_RET_NI PSCI_RET_NOT_SUPPORTED
-#define KVM_PSCI_RET_INVAL PSCI_RET_INVALID_PARAMS
-#define KVM_PSCI_RET_DENIED PSCI_RET_DENIED
-#endif
diff --git a/tests/time_test.cpp b/tests/time_test.cpp
index 378b4ac..74d691d 100644
--- a/tests/time_test.cpp
+++ b/tests/time_test.cpp
@@ -1005,3 +1005,7 @@
   GTEST_SKIP() << "glibc doesn't have timespec_get until 2.21";
 #endif
 }
+
+TEST(time, difftime) {
+  ASSERT_EQ(1.0, difftime(1, 0));
+}