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Linus Torvalds d412bc9f60 gcc-12: disable '-Warray-bounds' universally for now 
[ Upstream commit f0be87c42c ]

In commit 8b202ee218 ("s390: disable -Warray-bounds") the s390 people
disabled the '-Warray-bounds' warning for gcc-12, because the new logic
in gcc would cause warnings for their use of the S390_lowcore macro,
which accesses absolute pointers.

It turns out gcc-12 has many other issues in this area, so this takes
that s390 warning disable logic, and turns it into a kernel build config
entry instead.

Part of the intent is that we can make this all much more targeted, and
use this conflig flag to disable it in only particular configurations
that cause problems, with the s390 case as an example:

        select GCC12_NO_ARRAY_BOUNDS

and we could do that for other configuration cases that cause issues.

Or we could possibly use the CONFIG_CC_NO_ARRAY_BOUNDS thing in a more
targeted way, and disable the warning only for particular uses: again
the s390 case as an example:

  KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)

but this ends up just doing it globally in the top-level Makefile, since
the current issues are spread fairly widely all over:

  KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds

We'll try to limit this later, since the gcc-12 problems are rare enough
that *much* of the kernel can be built with it without disabling this
warning.

Cc: Kees Cook <keescook@chromium.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2022-06-22 14:27:55 +02:00
Documentation x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data 2022-06-16 13:32:04 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch gcc-12: disable '-Warray-bounds' universally for now 2022-06-22 14:27:55 +02:00
block blk-mq: do not update io_ticks with passthrough requests 2022-06-14 18:44:57 +02:00
certs Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
crypto crypto: cryptd - Protect per-CPU resource by disabling BH. 2022-06-09 10:30:30 +02:00
drivers mellanox: mlx5: avoid uninitialized variable warning with gcc-12 2022-06-22 14:27:54 +02:00
fs quota: Prevent memory allocation recursion while holding dq_lock 2022-06-22 14:27:51 +02:00
include ipv6: Fix signed integer overflow in __ip6_append_data 2022-06-22 14:27:54 +02:00
init gcc-12: disable '-Warray-bounds' universally for now 2022-06-22 14:27:55 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:30:30 +02:00
kernel dma-debug: make things less spammy under memory pressure 2022-06-22 14:27:49 +02:00
lib iov_iter: fix build issue due to possible type mis-match 2022-06-14 18:45:21 +02:00
mm mm/huge_memory: Fix xarray node memory leak 2022-06-14 18:45:19 +02:00
net ipv6: Fix signed integer overflow in l2tp_ip6_sendmsg 2022-06-22 14:27:54 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:30:46 +02:00
scripts scripts/gdb: change kernel config dumping method 2022-06-14 18:45:15 +02:00
security KEYS: trusted: tpm2: Fix migratable logic 2022-06-14 18:45:17 +02:00
sound ALSA: hda/realtek - Add HW8326 support 2022-06-22 14:27:53 +02:00
tools KVM: x86/speculation: Disable Fill buffer clear within guests 2022-06-16 13:32:05 +02:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-20 13:02:05 -04:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap hotfixes for 5.18-rc7 2022-05-13 10:22:37 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Merge branch 'arm/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc 2022-05-18 14:07:43 -10:00
Makefile gcc-12: disable '-Warray-bounds' universally for now 2022-06-22 14:27:55 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.