From 27600805e62f800bacf990354632eae4e487d34c Mon Sep 17 00:00:00 2001 From: Yazen Ghannam Date: Thu, 3 Sep 2026 10:43:25 -0500 Subject: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL. Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com Reported-by: Sashiko Assisted-by: LLM Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Mario Limonciello (AMD) Cc: Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com --- Documentation/admin-guide/sysctl/index.rst | 107 +++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 Documentation/admin-guide/sysctl/index.rst (limited to 'Documentation/admin-guide/sysctl/index.rst') diff --git a/Documentation/admin-guide/sysctl/index.rst b/Documentation/admin-guide/sysctl/index.rst new file mode 100644 index 000000000..50f00514f --- /dev/null +++ b/Documentation/admin-guide/sysctl/index.rst @@ -0,0 +1,107 @@ +=========================== +Documentation for /proc/sys +=========================== + +Copyright (c) 1998, 1999, Rik van Riel + +------------------------------------------------------------------------------ + +'Why', I hear you ask, 'would anyone even _want_ documentation +for them sysctl files? If anybody really needs it, it's all in +the source...' + +Well, this documentation is written because some people either +don't know they need to tweak something, or because they don't +have the time or knowledge to read the source code. + +Furthermore, the programmers who built sysctl have built it to +be actually used, not just for the fun of programming it :-) + +------------------------------------------------------------------------------ + +Legal blurb: + +As usual, there are two main things to consider: + +1. you get what you pay for +2. it's free + +The consequences are that I won't guarantee the correctness of +this document, and if you come to me complaining about how you +screwed up your system because of wrong documentation, I won't +feel sorry for you. I might even laugh at you... + +But of course, if you _do_ manage to screw up your system using +only the sysctl options used in this file, I'd like to hear of +it. Not only to have a great laugh, but also to make sure that +you're the last RTFMing person to screw up. + +In short, e-mail your suggestions, corrections and / or horror +stories to: + +Rik van Riel. + +-------------------------------------------------------------- + +Introduction +============ + +Sysctl is a means of configuring certain aspects of the kernel +at run-time, and the /proc/sys/ directory is there so that you +don't even need special tools to do it! +In fact, there are only four things needed to use these config +facilities: + +- a running Linux system +- root access +- common sense (this is especially hard to come by these days) +- knowledge of what all those values mean + +As a quick 'ls /proc/sys' will show, the directory consists of +several (arch-dependent?) subdirs. Each subdir is mainly about +one part of the kernel, so you can do configuration on a piece +by piece basis, or just some 'thematic frobbing'. + +This documentation is about: + +=============== =============================================================== +abi/ execution domains & personalities +<$ARCH> tuning controls for various CPU architecture (e.g. csky, s390) +crypto/ cryptographic subsystem +debug/ debugging features +dev/ device specific information (e.g. dev/cdrom/info) +fs/ specific filesystems + filehandle, inode, dentry and quota tuning + binfmt_misc +kernel/ global kernel info / tuning + miscellaneous stuff + some architecture-specific controls + security (LSM) stuff +net/ networking stuff, for documentation look in: + +proc/ +sunrpc/ SUN Remote Procedure Call (NFS) +user/ Per user namespace limits +vm/ memory management tuning + buffer and cache management +xen/ Xen hypervisor controls +=============== =============================================================== + +These are the subdirs I have on my system or have been discovered by +searching through the source code. There might be more or other subdirs +in another setup. If you see another dir, I'd really like to hear about +it :-) + +.. toctree:: + :maxdepth: 1 + + abi + crypto + debug + fs + kernel + net + sunrpc + user + vm + xen -- cgit v1.3.1