819771cc28
In subsequent patches we'll alter the structure and usage of struct exception_table_entry. For inline assembly, we create these using the `_ASM_EXTABLE()` CPP macro defined in <asm/uaccess.h>, and for plain assembly code we use the `_asm_extable()` GAS macro defined in <asm/assembler.h>, which are largely identical save for different escaping and stringification requirements. This patch moves the common definitions to a new <asm/asm-extable.h> header, so that it's easier to keep the two in-sync, and to remove the implication that these are only used for uaccess helpers (as e.g. load_unaligned_zeropad() is only used on kernel memory, and depends upon `_ASM_EXTABLE()`. At the same time, a few minor modifications are made for clarity and in preparation for subsequent patches: * The structure creation is factored out into an `__ASM_EXTABLE_RAW()` macro. This will make it easier to support different fixup variants in subsequent patches without needing to update all users of `_ASM_EXTABLE()`, and makes it easier to see tha the CPP and GAS variants of the macros are structurally identical. For the CPP macro, the stringification of fields is left to the wrapper macro, `_ASM_EXTABLE()`, as in subsequent patches it will be necessary to stringify fields in wrapper macros to safely concatenate strings which cannot be token-pasted together in CPP. * The fields of the structure are created separately on their own lines. This will make it easier to add/remove/modify individual fields clearly. * Additional parentheses are added around the use of macro arguments in field definitions to avoid any potential problems with evaluation due to operator precedence, and to make errors upon misuse clearer. * USER() is moved into <asm/asm-uaccess.h>, as it is not required by all assembly code, and is already refered to by comments in that file. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20211019160219.5202-8-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org> |
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| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.