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Miguel Ojeda 89eed1ab11 rust: upgrade to Rust 1.71.1 
This is the second upgrade to the Rust toolchain, from 1.68.2 to 1.71.1
(i.e. the latest).

See the upgrade policy [1] and the comments on the first upgrade in
commit 3ed03f4da0 ("rust: upgrade to Rust 1.68.2").

# Unstable features

No unstable features (that we use) were stabilized.

Therefore, the only unstable feature allowed to be used outside
the `kernel` crate is still `new_uninit`, though other code to be
upstreamed may increase the list.

Please see [2] for details.

# Required changes

For the upgrade, this patch requires the following changes:

  - Removal of the `__rust_*` allocator functions, together with
    the addition of the `__rust_no_alloc_shim_is_unstable` static.
    See [3] for details.

  - Some more compiler builtins added due to `<f{32,64}>::midpoint()`
    that got added in Rust 1.71 [4].

# `alloc` upgrade and reviewing

The vast majority of changes are due to our `alloc` fork being upgraded
at once.

There are two kinds of changes to be aware of: the ones coming from
upstream, which we should follow as closely as possible, and the updates
needed in our added fallible APIs to keep them matching the newer
infallible APIs coming from upstream.

Instead of taking a look at the diff of this patch, an alternative
approach is reviewing a diff of the changes between upstream `alloc` and
the kernel's. This allows to easily inspect the kernel additions only,
especially to check if the fallible methods we already have still match
the infallible ones in the new version coming from upstream.

Another approach is reviewing the changes introduced in the additions in
the kernel fork between the two versions. This is useful to spot
potentially unintended changes to our additions.

To apply these approaches, one may follow steps similar to the following
to generate a pair of patches that show the differences between upstream
Rust and the kernel (for the subset of `alloc` we use) before and after
applying this patch:

    # Get the difference with respect to the old version.
    git -C rust checkout $(linux/scripts/min-tool-version.sh rustc)
    git -C linux ls-tree -r --name-only HEAD -- rust/alloc |
        cut -d/ -f3- |
        grep -Fv README.md |
        xargs -IPATH cp rust/library/alloc/src/PATH linux/rust/alloc/PATH
    git -C linux diff --patch-with-stat --summary -R > old.patch
    git -C linux restore rust/alloc

    # Apply this patch.
    git -C linux am rust-upgrade.patch

    # Get the difference with respect to the new version.
    git -C rust checkout $(linux/scripts/min-tool-version.sh rustc)
    git -C linux ls-tree -r --name-only HEAD -- rust/alloc |
        cut -d/ -f3- |
        grep -Fv README.md |
        xargs -IPATH cp rust/library/alloc/src/PATH linux/rust/alloc/PATH
    git -C linux diff --patch-with-stat --summary -R > new.patch
    git -C linux restore rust/alloc

Now one may check the `new.patch` to take a look at the additions (first
approach) or at the difference between those two patches (second
approach). For the latter, a side-by-side tool is recommended.

Link: https://rust-for-linux.com/rust-version-policy [1]
Link: https://github.com/Rust-for-Linux/linux/issues/2 [2]
Link: https://github.com/rust-lang/rust/pull/86844 [3]
Link: https://github.com/rust-lang/rust/pull/92048 [4]
Closes: https://github.com/Rust-for-Linux/linux/issues/68
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Link: https://lore.kernel.org/r/20230729220317.416771-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2023-08-14 17:50:02 +02:00
..
atomic locking/atomic: scripts: fix ${atomic}_dec_if_positive() kerneldoc 2023-06-16 16:46:30 +02:00
basic kbuild: implement CONFIG_TRIM_UNUSED_KSYMS without recursion 2023-06-22 21:21:06 +09:00
clang-tools gen_compile_commands: add assembly files to compilation database 2023-07-23 22:36:07 +09:00
coccinelle Revert "debugfs, coccinelle: check for obsolete DEFINE_SIMPLE_ATTRIBUTE() usage" 2023-07-29 11:05:31 -04:00
dtc
dummy-tools
gcc-plugins
gdb scripts/gdb: fix SB_* constants parsing 2023-06-19 13:19:32 -07:00
genksyms
kconfig kconfig: gconfig: correct program name in help text 2023-07-12 23:46:57 +09:00
ksymoops
mod Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
package kbuild: deb-pkg: remove the CONFIG_MODULES check in buildeb 2023-06-27 08:31:27 +09:00
selinux
tracing
.gitignore
as-version.sh
asn1_compiler.c
bloat-o-meter
bootgraph.pl
bpf_doc.py
cc-can-link.sh
cc-version.sh
check-git
check-sysctl-docs sysctl: Remove register_sysctl_table 2023-05-23 21:43:26 -07:00
check_extable.sh
checkdeclares.pl
checkincludes.pl
checkkconfigsymbols.py
checkpatch.pl Scope-based Resource Management infrastructure 2023-07-04 13:50:38 -07:00
checkstack.pl
checksyscalls.sh
checkversion.pl
cleanfile
cleanpatch
coccicheck
config
const_structs.checkpatch
decode_stacktrace.sh
decodecode
depmod.sh
dev-needs.sh
diffconfig
documentation-file-ref-check
export_report.pl
extract-ikconfig
extract-module-sig.pl
extract-sys-certs.pl
extract-vmlinux
extract_xc3028.pl
faddr2line
file-size.sh
find-unused-docs.sh
gcc-x86_32-has-stack-protector.sh
gcc-x86_64-has-stack-protector.sh
gen-randstruct-seed.sh
generate_initcall_order.pl
generate_rust_analyzer.py scripts: make rust-analyzer for out-of-tree modules 2023-08-07 11:33:34 +02:00
generate_rust_target.rs
get_abi.pl
get_dvb_firmware
get_feat.pl
get_maintainer.pl
gfp-translate scripts: fix the gfp flags header path in gfp-translate 2023-06-19 13:19:32 -07:00
head-object-list.txt powerpc/64: Rename entry_64.S to prom_entry_64.S 2023-06-15 14:04:19 +10:00
headerdep.pl
headers_install.sh
insert-sys-cert.c
install.sh
jobserver-exec
kallsyms.c kallsyms: strip LTO-only suffixes from promoted global functions 2023-07-12 15:39:34 -07:00
Kbuild.include
Kconfig.include
kernel-doc A half-dozen late arriving docs patches. They are mostly fixes, but we 2023-07-06 22:15:38 -07:00
ld-version.sh
leaking_addresses.pl
Lindent
link-vmlinux.sh Kbuild updates for v6.4 2023-04-30 11:32:53 -07:00
Makefile
Makefile.asm-generic
Makefile.build kbuild: rust: avoid creating temporary files 2023-07-24 03:15:31 +09:00
Makefile.clang Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
Makefile.clean kbuild: make clean rule robust against too long argument error 2023-06-25 23:12:20 +09:00
Makefile.compiler Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
Makefile.debug
Makefile.defconf
Makefile.dtbinst kbuild: Support flat DTBs install 2023-06-21 07:51:08 -06:00
Makefile.extrawarn
Makefile.gcc-plugins
Makefile.headersinst
Makefile.host kbuild: rust: avoid creating temporary files 2023-07-24 03:15:31 +09:00
Makefile.kasan
Makefile.kcov
Makefile.kcsan
Makefile.kmsan
Makefile.lib kbuild: Disallow DTB overlays to built from .dts named source files 2023-05-22 10:34:37 +09:00
Makefile.modfinal btf, scripts: rust: drop is_rust_module.sh 2023-08-10 22:28:04 +02:00
Makefile.modinst
Makefile.modpost kbuild: implement CONFIG_TRIM_UNUSED_KSYMS without recursion 2023-06-22 21:21:06 +09:00
Makefile.package Kbuild updates for v6.4 2023-04-30 11:32:53 -07:00
Makefile.randstruct
Makefile.ubsan ubsan: Tighten UBSAN_BOUNDS on GCC 2023-05-16 13:57:14 -07:00
Makefile.userprogs
Makefile.vmlinux kbuild: Fix CFI failures with GCOV 2023-06-25 23:12:20 +09:00
Makefile.vmlinux_o
makelst
markup_oops.pl
min-tool-version.sh rust: upgrade to Rust 1.71.1 2023-08-14 17:50:02 +02:00
misc-check
mkcompile_h
mksysmap scripts/mksysmap: Ignore prefixed KCFI symbols 2023-06-27 08:35:43 +09:00
mkuboot.sh
module.lds.S
modules-check.sh
nsdeps
objdiff
objdump-func
orc_hash.sh x86/unwind/orc: Add ELF section with ORC version identifier 2023-06-16 17:17:42 +02:00
pahole-flags.sh bpf: Add --skip_encoding_btf_inconsistent_proto, --btf_gen_optimized to pahole flags for v1.25 2023-05-12 11:47:05 -07:00
pahole-version.sh
parse-maintainers.pl
patch-kernel
profile2linkerlist.pl
prune-kernel
recordmcount.c
recordmcount.h
recordmcount.pl
relocs_check.sh
remove-stale-files kbuild: implement CONFIG_TRIM_UNUSED_KSYMS without recursion 2023-06-22 21:21:06 +09:00
rust_is_available.sh kbuild: rust_is_available: check that output looks as expected 2023-08-10 01:18:34 +02:00
rust_is_available_bindgen_libclang.h
rust_is_available_test.py kbuild: rust_is_available: add test suite 2023-08-10 01:18:34 +02:00
setlocalversion
show_delta
sign-file.c
sorttable.c
sorttable.h
spdxcheck-test.sh
spdxcheck.py
spdxexclude
spelling.txt scripts/spelling.txt: remove 'thead' as a typo 2023-07-27 13:07:04 -07:00
sphinx-pre-install
split-man.pl
stackdelta
stackusage
subarch.include
syscallhdr.sh
syscallnr.sh
syscalltbl.sh
tags.sh Char/Misc and other driver subsystem updates for 6.5-rc1 2023-07-03 12:46:47 -07:00
test_fortify.sh
tools-support-relr.sh
unifdef.c
ver_linux
xen-hypercalls.sh
xz_wrap.sh