tree c169456b9cb9a155406d2717722454725e303e48
parent 452922955df215a417c80d09dab72bbc667a1861
author Randy Dunlap <rdunlap@infradead.org> 1647303045 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1655218352 +0200

x86/mm: Cleanup the control_va_addr_alignment() __setup handler

[ Upstream commit 1ef64b1e89e6d4018da46e08ffc32779a31160c7 ]

Clean up control_va_addr_alignment():

a. Make '=' required instead of optional (as documented).
b. Print a warning if an invalid option value is used.
c. Return 1 from the __setup handler when an invalid option value is
   used. This prevents the kernel from polluting init's (limited)
   environment space with the entire string.

Fixes: dfb09f9b7ab0 ("x86, amd: Avoid cache aliasing penalties on AMD family 15h")
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Link: https://lore.kernel.org/r/20220315001045.7680-1-rdunlap@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>