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authorMuralidhara M K <muralimk@amd.com>2022-03-24 13:27:29 +0100
committerBorislav Petkov <bp@suse.de>2022-04-05 19:22:27 +0200
commite1907d37514b8564ba18b4a768a35beee71cb011 (patch)
treed0298969c1cec749a0c601efb89e2fdc158284f6 /mm/page_poison.c
parentLinux 5.18-rc1 (diff)
downloadlinux-e1907d37514b8564ba18b4a768a35beee71cb011.tar.xz
linux-e1907d37514b8564ba18b4a768a35beee71cb011.zip
x86/amd_nb: Unexport amd_cache_northbridges()
amd_cache_northbridges() is exported by amd_nb.c and is called by amd64-agp.c and amd64_edac.c modules at module_init() time so that NB descriptors are properly cached before those drivers can use them. However, the init_amd_nbs() initcall already does call amd_cache_northbridges() unconditionally and thus makes sure the NB descriptors are enumerated. That initcall is a fs_initcall type which is on the 5th group (starting from 0) of initcalls that gets run in increasing numerical order by the init code. The module_init() call is turned into an __initcall() in the MODULE=n case and those are device-level initcalls, i.e., group 6. Therefore, the northbridges caching is already finished by the time module initialization starts and thus the correct initialization order is retained. Unexport amd_cache_northbridges(), update dependent modules to call amd_nb_num() instead. While at it, simplify the checks in amd_cache_northbridges(). [ bp: Heavily massage and *actually* explain why the change is ok. ] Signed-off-by: Muralidhara M K <muralimk@amd.com> Signed-off-by: Naveen Krishna Chatradhi <nchatrad@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220324122729.221765-1-nchatrad@amd.com
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