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Juergen Gross 2ee681584b xen/gntdev: remove struct gntdev_copy_batch from stack 
[ Upstream commit 70045cf659 ]

When compiling the kernel with LLVM, the following warning was issued:

  drivers/xen/gntdev.c:991: warning: stack frame size (1160) exceeds
  limit (1024) in function 'gntdev_ioctl'

The main reason is struct gntdev_copy_batch which is located on the
stack and has a size of nearly 1kb.

For performance reasons it shouldn't by just dynamically allocated
instead, so allocate a new instance when needed and instead of freeing
it put it into a list of free structs anchored in struct gntdev_priv.

Fixes: a4cdb556ca ("xen/gntdev: add ioctl for grant copy")
Reported-by: Abinash Singh <abinashsinghlalotra@gmail.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20250703073259.17356-1-jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-15 12:04:58 +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 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.