Commit 6a069876eb14 for kernel

commit 6a069876eb1402478900ee0eb7d7fe276bb1f4e3
Author: Alice Ryhl <aliceryhl@google.com>
Date:   Mon Jan 5 10:44:06 2026 +0000

    rust: bitops: fix missing _find_* functions on 32-bit ARM

    On 32-bit ARM, you may encounter linker errors such as this one:

            ld.lld: error: undefined symbol: _find_next_zero_bit
            >>> referenced by rust_binder_main.43196037ba7bcee1-cgu.0
            >>>               drivers/android/binder/rust_binder_main.o:(<rust_binder_main::process::Process>::insert_or_update_handle) in archive vmlinux.a
            >>> referenced by rust_binder_main.43196037ba7bcee1-cgu.0
            >>>               drivers/android/binder/rust_binder_main.o:(<rust_binder_main::process::Process>::insert_or_update_handle) in archive vmlinux.a

    This error occurs because even though the functions are declared by
    include/linux/find.h, the definition is #ifdef'd out on 32-bit ARM. This
    is because arch/arm/include/asm/bitops.h contains:

            #define find_first_zero_bit(p,sz)       _find_first_zero_bit_le(p,sz)
            #define find_next_zero_bit(p,sz,off)    _find_next_zero_bit_le(p,sz,off)
            #define find_first_bit(p,sz)            _find_first_bit_le(p,sz)
            #define find_next_bit(p,sz,off)         _find_next_bit_le(p,sz,off)

    And the underscore-prefixed function is conditional on #ifndef of the
    non-underscore-prefixed name, but the declaration in find.h is *not*
    conditional on that #ifndef.

    To fix the linker error, we ensure that the symbols in question exist
    when compiling Rust code. We do this by defining them in rust/helpers/
    whenever the normal definition is #ifndef'd out.

    Note that these helpers are somewhat unusual in that they do not have
    the rust_helper_ prefix that most helpers have. Adding the rust_helper_
    prefix does not compile, as 'bindings::_find_next_zero_bit()' will
    result in a call to a symbol called _find_next_zero_bit as defined by
    include/linux/find.h rather than a symbol with the rust_helper_ prefix.
    This is because when a symbol is present in both include/ and
    rust/helpers/, the one from include/ wins under the assumption that the
    current configuration is one where that helper is unnecessary. This
    heuristic fails for _find_next_zero_bit() because the header file always
    declares it even if the symbol does not exist.

    The functions still use the __rust_helper annotation. This lets the
    wrapper function be inlined into Rust code even if full kernel LTO is
    not used once the patch series for that feature lands.

    Yury: arches are free to implement they own find_bit() functions. Most
    rely on generic implementation, but arm32 and m86k - not; so they require
    custom handling. Alice confirmed it fixes the build for both.

    Cc: stable@vger.kernel.org
    Fixes: 6cf93a9ed39e ("rust: add bindings for bitops.h")
    Reported-by: Andreas Hindborg <a.hindborg@kernel.org>
    Closes: https://rust-for-linux.zulipchat.com/#narrow/channel/x/topic/x/near/561677301
    Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
    Reviewed-by: Dirk Behme <dirk.behme@de.bosch.com>
    Signed-off-by: Alice Ryhl <aliceryhl@google.com>
    Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>

diff --git a/rust/helpers/bitops.c b/rust/helpers/bitops.c
index 5d0861d29d3f..e79ef9e6d98f 100644
--- a/rust/helpers/bitops.c
+++ b/rust/helpers/bitops.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0

 #include <linux/bitops.h>
+#include <linux/find.h>

 void rust_helper___set_bit(unsigned long nr, unsigned long *addr)
 {
@@ -21,3 +22,44 @@ void rust_helper_clear_bit(unsigned long nr, volatile unsigned long *addr)
 {
 	clear_bit(nr, addr);
 }
+
+/*
+ * The rust_helper_ prefix is intentionally omitted below so that the
+ * declarations in include/linux/find.h are compatible with these helpers.
+ *
+ * Note that the below #ifdefs mean that the helper is only created if C does
+ * not provide a definition.
+ */
+#ifdef find_first_zero_bit
+__rust_helper
+unsigned long _find_first_zero_bit(const unsigned long *p, unsigned long size)
+{
+	return find_first_zero_bit(p, size);
+}
+#endif /* find_first_zero_bit */
+
+#ifdef find_next_zero_bit
+__rust_helper
+unsigned long _find_next_zero_bit(const unsigned long *addr,
+				  unsigned long size, unsigned long offset)
+{
+	return find_next_zero_bit(addr, size, offset);
+}
+#endif /* find_next_zero_bit */
+
+#ifdef find_first_bit
+__rust_helper
+unsigned long _find_first_bit(const unsigned long *addr, unsigned long size)
+{
+	return find_first_bit(addr, size);
+}
+#endif /* find_first_bit */
+
+#ifdef find_next_bit
+__rust_helper
+unsigned long _find_next_bit(const unsigned long *addr, unsigned long size,
+			     unsigned long offset)
+{
+	return find_next_bit(addr, size, offset);
+}
+#endif /* find_next_bit */