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Kernel for Galaxy S24, rebased on CLO sources (WIP)
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Nathan Chancellor 61114e734c
riscv: Move alternative length validation into subsection 
After commit 49b290e430 ("riscv: prevent compressed instructions in
alternatives"), builds with LLVM's integrated assembler fail:

  In file included from arch/riscv/mm/init.c:10:
  In file included from ./include/linux/mm.h:29:
  In file included from ./include/linux/pgtable.h:6:
  In file included from ./arch/riscv/include/asm/pgtable.h:108:
  ./arch/riscv/include/asm/tlbflush.h:23:2: error: expected assembly-time absolute expression
          ALT_FLUSH_TLB_PAGE(__asm__ __volatile__ ("sfence.vma %0" : : "r" (addr) : "memory"));
          ^
  ./arch/riscv/include/asm/errata_list.h:33:5: note: expanded from macro 'ALT_FLUSH_TLB_PAGE'
  asm(ALTERNATIVE("sfence.vma %0", "sfence.vma", SIFIVE_VENDOR_ID,        \
      ^
  ./arch/riscv/include/asm/alternative-macros.h:187:2: note: expanded from macro 'ALTERNATIVE'
          _ALTERNATIVE_CFG(old_content, new_content, vendor_id, errata_id, CONFIG_k)
          ^
  ./arch/riscv/include/asm/alternative-macros.h:113:2: note: expanded from macro '_ALTERNATIVE_CFG'
          __ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k))
          ^
  ./arch/riscv/include/asm/alternative-macros.h:110:2: note: expanded from macro '__ALTERNATIVE_CFG'
          ALT_NEW_CONTENT(vendor_id, errata_id, enable, new_c)
          ^
  ./arch/riscv/include/asm/alternative-macros.h:99:3: note: expanded from macro 'ALT_NEW_CONTENT'
          ".org   . - (889b - 888b) + (887b - 886b)\n"                    \
           ^
  <inline asm>:26:6: note: instantiated into assembly here
  .org    . - (889b - 888b) + (887b - 886b)
          ^

This error happens because LLVM's integrated assembler has a one-pass
design, which means it cannot figure out the instruction lengths when
the .org directive is outside of the subsection that contains the
instructions, which was changed by the .option directives added by the
above change.

Move the .org directives before the .previous directive so that these
directives are always within the same subsection, which resolves the
failures and does not introduce any new issues with GNU as. This was
done for arm64 in commit 966a0acce2 ("arm64/alternatives: move length
validation inside the subsection") and commit 22315a2296 ("arm64:
alternatives: Move length validation in alternative_{insn, endif}").

While there is no error from the assembly versions of the macro, they
appear to have the same problem so just make the same change there as
well so that there are no problems in the future.

Link: https://github.com/ClangBuiltLinux/linux/issues/1640
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220516214520.3252074-1-nathan@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-06-02 15:55:22 -07:00
arch riscv: Move alternative length validation into subsection 2022-06-02 15:55:22 -07:00
block Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
certs Kbuild updates for v5.19 2022-05-26 12:09:50 -07:00
crypto This update includes the following changes: 2022-05-27 18:06:49 -07:00
Documentation Documentation: riscv: Add sv48 description to VM layout 2022-06-01 20:38:34 -07:00
drivers IOMMU Updates for Linux v5.19 2022-05-31 09:56:54 -07:00
fs RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
include RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
init RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-05-09 18:29:21 -07:00
kernel RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
lib tracing updates for 5.19: 2022-05-29 10:31:36 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
net hyperv-next for 5.19 2022-05-28 11:39:01 -07:00
samples drm for 5.19-rc1 2022-05-25 16:18:27 -07:00
scripts Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
security linux-kselftest-kunit-5.19-rc1 2022-05-25 11:32:53 -07:00
sound m68knommu: changes for linux 5.19 2022-05-30 10:56:18 -07:00
tools RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt S390: 2022-05-26 14:20:14 -07:00
.clang-format clang-format: Fix space after for_each macros 2022-05-20 19:27:16 +02:00
.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 kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap Scheduler changes in this cycle were: 2022-05-24 11:11:13 -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 IOMMU Updates for Linux v5.19 2022-05-31 09:56:54 -07:00
Makefile Kbuild updates for v5.19 2022-05-26 12:09:50 -07:00
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.