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ac6119e7f2
We already disable KASAN instrumentation specifically for the EFI routines that are known to dereference memory addresses that KASAN does not know about, avoiding false positive KASAN splats. However, as it turns out, having GCOV or KASAN instrumentation enabled interferes with the compiler's ability to optimize away function calls that are guarded by IS_ENABLED() checks that should have resulted in those references to have been const-propagated out of existence. But with instrumenation enabled, we may get build errors like: ld: arch/x86/platform/efi/efi_64.o: in function `efi_thunk_set_virtual_address_map': ld: arch/x86/platform/efi/efi_64.o: in function `efi_set_virtual_address_map': in builds where CONFIG_EFI=y but CONFIG_EFI_MIXED or CONFIG_X86_UV are not defined, even though the invocations are conditional on IS_ENABLED() checks against the respective Kconfig symbols. So let's disable instrumentation entirely for this subdirectory, which isn't that useful here to begin with. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: linux-efi@vger.kernel.org
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.