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243ea511fe
Add kernel-doc markup for the register parameters passed by the vDSO blob
to the user handler to suppress build warnings, e.g.
WARNING: arch/x86/include/uapi/asm/sgx.h:157 function parameter 'r8' not
described in 'sgx_enclave_user_handler_t'
Call out that except for RSP, the registers are undefined on asynchronous
exits as far as the vDSO ABI is concerned. E.g. the vDSO's exception
handler clobbers RDX, RDI, and RSI, and the kernel doesn't guarantee that
R8 or R9 will be zero (the synthetic value loaded by the CPU).
Closes: https://lore.kernel.org/all/20251106145506.145fc620@canb.auug.org.au
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://patch.msgid.link/20251112160708.1343355-3-seanjc%40google.com
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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 reStructuredText 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.