diff --git a/src/fuchsia/mod.rs b/src/fuchsia/mod.rs
index bfd71ff78dda7..22f9c6faf755b 100644
--- a/src/fuchsia/mod.rs
+++ b/src/fuchsia/mod.rs
@@ -292,6 +292,8 @@ s! {
         __dummy4: [c_char; 16],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/psp.rs b/src/psp.rs
index 56d528cff54c2..131ef3180332b 100644
--- a/src/psp.rs
+++ b/src/psp.rs
@@ -1415,6 +1415,8 @@ s! {
         pub stack: [u32; 8],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct GeCallbackData {
         pub signal_func: Option<extern "C" fn(id: i32, arg: *mut c_void)>,
         pub signal_arg: *mut c_void,
@@ -1537,6 +1539,8 @@ s! {
         pub stack_mpid: SceUid,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelThreadInfo {
         pub size: usize,
         pub name: [u8; 32],
@@ -1611,6 +1615,8 @@ s! {
         pub first_message: *mut c_void,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelVTimerInfo {
         pub size: usize,
         pub name: [u8; 32],
@@ -1622,6 +1628,8 @@ s! {
         pub common: *mut c_void,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelThreadEventHandlerInfo {
         pub size: usize,
         pub name: [u8; 32],
@@ -1631,6 +1639,8 @@ s! {
         pub common: *mut c_void,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelAlarmInfo {
         pub size: usize,
         pub schedule: SceKernelSysClock,
@@ -1688,6 +1698,8 @@ s! {
         pub size: usize,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelCallbackInfo {
         pub size: usize,
         pub name: [u8; 32usize],
@@ -1787,6 +1799,8 @@ s! {
         pub type_: UmdType,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceMpegRingbuffer {
         pub packets: i32,
         pub unk0: u32,
diff --git a/src/unix/bsd/apple/b64/x86_64/mod.rs b/src/unix/bsd/apple/b64/x86_64/mod.rs
index aa5ab85c0268b..cfb1b8a8a5976 100644
--- a/src/unix/bsd/apple/b64/x86_64/mod.rs
+++ b/src/unix/bsd/apple/b64/x86_64/mod.rs
@@ -109,6 +109,8 @@ s! {
         _private: [crate::uintptr_t; 16], // FIXME(macos): keeping private for now
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct malloc_zone_t {
         _reserved1: *mut c_void,
         _reserved2: *mut c_void,
diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index 168c85094f5be..8ecb3336277dd 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -520,6 +520,8 @@ s_no_extra_traits! {
         pub mc_fpregs: [[c_uint; 8]; 32],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct ucontext_t {
         pub uc_sigmask: crate::sigset_t,
         pub uc_mcontext: mcontext_t,
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index bd4601576294a..de41a7c6d3ed6 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -4662,7 +4662,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const crate::msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if cmsg.is_null() {
             return crate::CMSG_FIRSTHDR(mhdr);
-        };
+        }
         let next =
             cmsg as usize + _ALIGN((*cmsg).cmsg_len as usize) + _ALIGN(mem::size_of::<cmsghdr>());
         let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;
diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index 3addd5a8a6e36..7bcb55ac25d9e 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -2295,7 +2295,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const crate::msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if cmsg.is_null() {
             return crate::CMSG_FIRSTHDR(mhdr);
-        };
+        }
         let next =
             cmsg as usize + _ALIGN((*cmsg).cmsg_len as usize) + _ALIGN(mem::size_of::<cmsghdr>());
         let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;
diff --git a/src/unix/bsd/netbsdlike/openbsd/mod.rs b/src/unix/bsd/netbsdlike/openbsd/mod.rs
index 3b3971692fe38..d0bb4badac271 100644
--- a/src/unix/bsd/netbsdlike/openbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/openbsd/mod.rs
@@ -630,7 +630,7 @@ impl siginfo_t {
             _pad: [c_int; SI_PAD],
             _pid: crate::pid_t,
         }
-        (*(self as *const siginfo_t as *const siginfo_timer))._pid
+        (*(self as *const siginfo_t).cast::<siginfo_timer>())._pid
     }
 
     pub unsafe fn si_uid(&self) -> crate::uid_t {
@@ -643,7 +643,7 @@ impl siginfo_t {
             _pid: crate::pid_t,
             _uid: crate::uid_t,
         }
-        (*(self as *const siginfo_t as *const siginfo_timer))._uid
+        (*(self as *const siginfo_t).cast::<siginfo_timer>())._uid
     }
 
     pub unsafe fn si_value(&self) -> crate::sigval {
@@ -657,7 +657,7 @@ impl siginfo_t {
             _uid: crate::uid_t,
             value: crate::sigval,
         }
-        (*(self as *const siginfo_t as *const siginfo_timer)).value
+        (*(self as *const siginfo_t).cast::<siginfo_timer>()).value
     }
 }
 
@@ -1869,7 +1869,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const crate::msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if cmsg.is_null() {
             return crate::CMSG_FIRSTHDR(mhdr);
-        };
+        }
         let next =
             cmsg as usize + _ALIGN((*cmsg).cmsg_len as usize) + _ALIGN(mem::size_of::<cmsghdr>());
         let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;
diff --git a/src/unix/cygwin/mod.rs b/src/unix/cygwin/mod.rs
index 2986c7c74a7c4..b03c882027037 100644
--- a/src/unix/cygwin/mod.rs
+++ b/src/unix/cygwin/mod.rs
@@ -351,6 +351,8 @@ s! {
         pub cr2: u64,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigevent {
         pub sigev_value: sigval,
         pub sigev_signo: c_int,
diff --git a/src/unix/haiku/mod.rs b/src/unix/haiku/mod.rs
index 6b168a470bb02..9d04266c794da 100644
--- a/src/unix/haiku/mod.rs
+++ b/src/unix/haiku/mod.rs
@@ -1533,7 +1533,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if cmsg.is_null() {
             return crate::CMSG_FIRSTHDR(mhdr);
-        };
+        }
         let next = cmsg as usize
             + CMSG_ALIGN((*cmsg).cmsg_len as usize)
             + CMSG_ALIGN(mem::size_of::<cmsghdr>());
diff --git a/src/unix/haiku/native.rs b/src/unix/haiku/native.rs
index a5a5e53491556..446c2fa0433e9 100644
--- a/src/unix/haiku/native.rs
+++ b/src/unix/haiku/native.rs
@@ -403,11 +403,14 @@ s! {
     }
 
     // kernel/image.h
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct image_info {
         pub id: image_id,
         pub image_type: c_int,
         pub sequence: i32,
         pub init_order: i32,
+        // FIXME(1.0): these should be made optional
         pub init_routine: extern "C" fn(),
         pub term_routine: extern "C" fn(),
         pub device: crate::dev_t,
diff --git a/src/unix/hurd/mod.rs b/src/unix/hurd/mod.rs
index 49bb076633ea2..843e7f4c3915d 100644
--- a/src/unix/hurd/mod.rs
+++ b/src/unix/hurd/mod.rs
@@ -3445,7 +3445,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if ((*cmsg).cmsg_len as usize) < mem::size_of::<cmsghdr>() {
             return core::ptr::null_mut::<cmsghdr>();
-        };
+        }
         let next = (cmsg as usize + CMSG_ALIGN((*cmsg).cmsg_len as usize)) as *mut cmsghdr;
         let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;
         if (next.offset(1)) as usize > max
diff --git a/src/unix/linux_like/android/b32/mod.rs b/src/unix/linux_like/android/b32/mod.rs
index 43e739bd9592b..d02dbf92d7924 100644
--- a/src/unix/linux_like/android/b32/mod.rs
+++ b/src/unix/linux_like/android/b32/mod.rs
@@ -12,6 +12,8 @@ pub type __u64 = c_ulonglong;
 pub type __s64 = c_longlong;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/android/b64/mod.rs b/src/unix/linux_like/android/b64/mod.rs
index b23c562cd8b7f..e16c251a6d519 100644
--- a/src/unix/linux_like/android/b64/mod.rs
+++ b/src/unix/linux_like/android/b64/mod.rs
@@ -12,6 +12,8 @@ s! {
         __val: [c_ulong; 1],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_flags: c_int,
         pub sa_sigaction: crate::sighandler_t,
diff --git a/src/unix/linux_like/emscripten/mod.rs b/src/unix/linux_like/emscripten/mod.rs
index deac314ce35c8..57d00d1879930 100644
--- a/src/unix/linux_like/emscripten/mod.rs
+++ b/src/unix/linux_like/emscripten/mod.rs
@@ -158,6 +158,8 @@ s! {
         pub sem_flg: c_short,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
@@ -1365,7 +1367,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if ((*cmsg).cmsg_len as usize) < mem::size_of::<cmsghdr>() {
             return core::ptr::null_mut::<cmsghdr>();
-        };
+        }
         let next = (cmsg as usize + super::CMSG_ALIGN((*cmsg).cmsg_len as usize)) as *mut cmsghdr;
         let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;
         if (next.offset(1)) as usize > max {
diff --git a/src/unix/linux_like/linux/gnu/b32/arm/mod.rs b/src/unix/linux_like/linux/gnu/b32/arm/mod.rs
index 80d7be3891f3a..3f81de3545de6 100644
--- a/src/unix/linux_like/linux/gnu/b32/arm/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/arm/mod.rs
@@ -4,6 +4,8 @@ use crate::{off64_t, off_t};
 pub type wchar_t = u32;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b32/csky/mod.rs b/src/unix/linux_like/linux/gnu/b32/csky/mod.rs
index 89189e63302c4..b8f73e2d5414a 100644
--- a/src/unix/linux_like/linux/gnu/b32/csky/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/csky/mod.rs
@@ -4,6 +4,8 @@ use crate::{off64_t, off_t};
 pub type wchar_t = u32;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b32/m68k/mod.rs b/src/unix/linux_like/linux/gnu/b32/m68k/mod.rs
index b4c63c1df9b71..fe4b05f4e2a10 100644
--- a/src/unix/linux_like/linux/gnu/b32/m68k/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/m68k/mod.rs
@@ -4,6 +4,8 @@ use crate::{off64_t, off_t};
 pub type wchar_t = i32;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b32/mips/mod.rs b/src/unix/linux_like/linux/gnu/b32/mips/mod.rs
index 6581d729e9923..507672f8a974c 100644
--- a/src/unix/linux_like/linux/gnu/b32/mips/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/mips/mod.rs
@@ -163,6 +163,8 @@ s! {
         __f_spare: [c_int; 6],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_flags: c_int,
         pub sa_sigaction: crate::sighandler_t,
diff --git a/src/unix/linux_like/linux/gnu/b32/powerpc.rs b/src/unix/linux_like/linux/gnu/b32/powerpc.rs
index d562aac3700a8..791f14956806d 100644
--- a/src/unix/linux_like/linux/gnu/b32/powerpc.rs
+++ b/src/unix/linux_like/linux/gnu/b32/powerpc.rs
@@ -4,6 +4,8 @@ use crate::{off64_t, off_t};
 pub type wchar_t = i32;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b32/riscv32/mod.rs b/src/unix/linux_like/linux/gnu/b32/riscv32/mod.rs
index bcae7c2048bf9..d9599ddb582fc 100644
--- a/src/unix/linux_like/linux/gnu/b32/riscv32/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/riscv32/mod.rs
@@ -108,6 +108,8 @@ s! {
         pub ss_size: size_t,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b32/sparc/mod.rs b/src/unix/linux_like/linux/gnu/b32/sparc/mod.rs
index 03760e72e5e93..cfe2101b4af77 100644
--- a/src/unix/linux_like/linux/gnu/b32/sparc/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/sparc/mod.rs
@@ -6,6 +6,8 @@ use crate::{off64_t, off_t};
 pub type wchar_t = i32;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b32/x86/mod.rs b/src/unix/linux_like/linux/gnu/b32/x86/mod.rs
index 0f23f0033417a..da6af94375e4f 100644
--- a/src/unix/linux_like/linux/gnu/b32/x86/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/x86/mod.rs
@@ -5,6 +5,8 @@ pub type wchar_t = i32;
 pub type greg_t = i32;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs b/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs
index 0e990f6006378..b310af8e4e531 100644
--- a/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs
@@ -11,6 +11,8 @@ pub type __u64 = c_ulonglong;
 pub type __s64 = c_longlong;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b64/loongarch64/mod.rs b/src/unix/linux_like/linux/gnu/b64/loongarch64/mod.rs
index 6162565da17ca..c67177c7067f9 100644
--- a/src/unix/linux_like/linux/gnu/b64/loongarch64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/loongarch64/mod.rs
@@ -134,6 +134,8 @@ s! {
         __size: [c_ulong; 7],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b64/mips64/mod.rs b/src/unix/linux_like/linux/gnu/b64/mips64/mod.rs
index 375ea40cb6a1d..8bd9542a62f1e 100644
--- a/src/unix/linux_like/linux/gnu/b64/mips64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/mips64/mod.rs
@@ -136,6 +136,8 @@ s! {
         __size: [c_ulong; 7],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_flags: c_int,
         pub sa_sigaction: crate::sighandler_t,
diff --git a/src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs b/src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs
index e537dbcd0a86a..5073a8af7a41e 100644
--- a/src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs
@@ -11,6 +11,8 @@ pub type __u64 = c_ulong;
 pub type __s64 = c_long;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs b/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
index d689bb14c3ebf..6da6eeccca486 100644
--- a/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
@@ -143,6 +143,8 @@ s! {
         pub ss_size: size_t,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b64/s390x.rs b/src/unix/linux_like/linux/gnu/b64/s390x.rs
index aa42a025db351..029485c5b4a32 100644
--- a/src/unix/linux_like/linux/gnu/b64/s390x.rs
+++ b/src/unix/linux_like/linux/gnu/b64/s390x.rs
@@ -12,6 +12,8 @@ pub type __u64 = u64;
 pub type __s64 = i64;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         __glibc_reserved0: c_int,
diff --git a/src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs b/src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs
index f77606e10cbf5..cdbd9b43b28c7 100644
--- a/src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs
@@ -11,6 +11,8 @@ pub type __u64 = c_ulonglong;
 pub type __s64 = c_longlong;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/b64/x86_64/mod.rs b/src/unix/linux_like/linux/gnu/b64/x86_64/mod.rs
index e76ae75125d17..ea8aeda42d63d 100644
--- a/src/unix/linux_like/linux/gnu/b64/x86_64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/x86_64/mod.rs
@@ -12,6 +12,8 @@ pub type __u64 = c_ulonglong;
 pub type __s64 = c_longlong;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/gnu/mod.rs b/src/unix/linux_like/linux/gnu/mod.rs
index 4fc9a0aa2068b..e1ee70b7428f4 100644
--- a/src/unix/linux_like/linux/gnu/mod.rs
+++ b/src/unix/linux_like/linux/gnu/mod.rs
@@ -366,6 +366,8 @@ s! {
         __pad: i32,
         #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
         pub tv_nsec: c_long,
+        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+        pub tv_nsec: i64,
         #[cfg(all(gnu_time_bits64, target_endian = "little"))]
         __pad: i32,
     }
diff --git a/src/unix/linux_like/linux/mod.rs b/src/unix/linux_like/linux/mod.rs
index 9439ce257fffd..992df6cffd92e 100644
--- a/src/unix/linux_like/linux/mod.rs
+++ b/src/unix/linux_like/linux/mod.rs
@@ -1366,21 +1366,22 @@ s! {
 
     // linux/pidfd.h
 
+    #[non_exhaustive]
     pub struct pidfd_info {
-        mask: crate::__u64,
-        cgroupid: crate::__u64,
-        pid: crate::__u32,
-        tgid: crate::__u32,
-        ppid: crate::__u32,
-        ruid: crate::__u32,
-        rgid: crate::__u32,
-        euid: crate::__u32,
-        egid: crate::__u32,
-        suid: crate::__u32,
-        sgid: crate::__u32,
-        fsuid: crate::__u32,
-        fsgid: crate::__u32,
-        exit_code: crate::__s32,
+        pub mask: crate::__u64,
+        pub cgroupid: crate::__u64,
+        pub pid: crate::__u32,
+        pub tgid: crate::__u32,
+        pub ppid: crate::__u32,
+        pub ruid: crate::__u32,
+        pub rgid: crate::__u32,
+        pub euid: crate::__u32,
+        pub egid: crate::__u32,
+        pub suid: crate::__u32,
+        pub sgid: crate::__u32,
+        pub fsuid: crate::__u32,
+        pub fsgid: crate::__u32,
+        pub exit_code: crate::__s32,
     }
 
     // linux/uio.h
diff --git a/src/unix/linux_like/linux/musl/mod.rs b/src/unix/linux_like/linux/musl/mod.rs
index fb083fd54eea0..e2afbd860a1ce 100644
--- a/src/unix/linux_like/linux/musl/mod.rs
+++ b/src/unix/linux_like/linux/musl/mod.rs
@@ -142,6 +142,8 @@ s! {
         __dummy4: [c_char; 16],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,
diff --git a/src/unix/linux_like/linux/uclibc/arm/mod.rs b/src/unix/linux_like/linux/uclibc/arm/mod.rs
index 7a517f4974694..c54d77b194c48 100644
--- a/src/unix/linux_like/linux/uclibc/arm/mod.rs
+++ b/src/unix/linux_like/linux/uclibc/arm/mod.rs
@@ -163,6 +163,8 @@ s! {
         __val: [c_ulong; 2],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_flags: c_ulong,
diff --git a/src/unix/linux_like/linux/uclibc/x86_64/mod.rs b/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
index 4a6c19fc97da3..fbc87be74125d 100644
--- a/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
+++ b/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
@@ -144,6 +144,8 @@ s! {
         st_pad4: [c_long; 3],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_handler: crate::sighandler_t,
         pub sa_flags: c_ulong,
diff --git a/src/unix/nto/mod.rs b/src/unix/nto/mod.rs
index 581b99e6728f0..7270beacacb5a 100644
--- a/src/unix/nto/mod.rs
+++ b/src/unix/nto/mod.rs
@@ -576,6 +576,8 @@ s! {
         re_g: *mut c_void,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct _thread_attr {
         pub __flags: c_int,
         pub __stacksize: size_t,
diff --git a/src/unix/nto/neutrino.rs b/src/unix/nto/neutrino.rs
index 71a2301d1b968..8aac468009785 100644
--- a/src/unix/nto/neutrino.rs
+++ b/src/unix/nto/neutrino.rs
@@ -137,6 +137,8 @@ s! {
         pub ev: crate::__c_anonymous_struct_ev,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct _sighandler_info {
         pub siginfo: crate::siginfo_t,
         pub handler: Option<unsafe extern "C" fn(value: c_int)>,
diff --git a/src/unix/nuttx/mod.rs b/src/unix/nuttx/mod.rs
index de734f9e0f63d..69732d845b400 100644
--- a/src/unix/nuttx/mod.rs
+++ b/src/unix/nuttx/mod.rs
@@ -32,7 +32,7 @@ s! {
         pub st_dev: dev_t,
         pub st_ino: ino_t,
         pub st_mode: mode_t,
-        pub st_nlink: u64,
+        pub st_nlink: nlink_t,
         pub st_uid: u32,
         pub st_gid: u32,
         pub st_rdev: dev_t,
diff --git a/src/unix/redox/mod.rs b/src/unix/redox/mod.rs
index 859cdccde05cd..9a79d0e280f0c 100644
--- a/src/unix/redox/mod.rs
+++ b/src/unix/redox/mod.rs
@@ -157,6 +157,8 @@ s! {
         pub pw_shell: *mut c_char,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_flags: c_ulong,
diff --git a/src/unix/solarish/mod.rs b/src/unix/solarish/mod.rs
index 9f90c4cbaaedc..addfbe054b85f 100644
--- a/src/unix/solarish/mod.rs
+++ b/src/unix/solarish/mod.rs
@@ -2422,7 +2422,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const crate::msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if cmsg.is_null() {
             return crate::CMSG_FIRSTHDR(mhdr);
-        };
+        }
         let next =
             _CMSG_HDR_ALIGN(cmsg as usize + (*cmsg).cmsg_len as usize + size_of::<cmsghdr>());
         let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;