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Michael Karcher c31cb4df70 sparc: fix accurate exception reporting in copy_{from,to}_user for M7 [ Upstream commit `936fb51275` ] The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. This commit fixes a couple of bad calculations. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged. Fixes: `34060b8fff` ("arch/sparc: Add accurate exception reporting in M7memcpy") Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> # on Oracle SPARC S7 Tested-by: Tony Rodriguez <unixpro1970@gmail.com> # S7, see https://lore.kernel.org/r/98564e2e68df2dda0e00c67a75c7f7dfedb33c7e.camel@physik.fu-berlin.de Signed-off-by: Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de> Reviewed-by: Andreas Larsson <andreas@gaisler.com> Link: https://lore.kernel.org/r/20250905-memcpy_series-v4-5-1ca72dda195b@mkarcher.dialup.fu-berlin.de Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-10-15 12:00:14 +02:00
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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 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.