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x86: Fix return value of __setup handlers

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[ Upstream commit 12441ccdf5e2f5a01a46e344976cbbd3d46845c9 ]

__setup() handlers should return 1 to obsolete_checksetup() in
init/main.c to indicate that the boot option has been handled. A return
of 0 causes the boot option/value to be listed as an Unknown kernel
parameter and added to init's (limited) argument (no '=') or environment
(with '=') strings. So return 1 from these x86 __setup handlers.

Examples:

  Unknown kernel command line parameters "apicpmtimer
    BOOT_IMAGE=/boot/bzImage-517rc8 vdso=1 ring3mwait=disable", will be
    passed to user space.

  Run /sbin/init as init process
   with arguments:
     /sbin/init
     apicpmtimer
   with environment:
     HOME=/
     TERM=linux
     BOOT_IMAGE=/boot/bzImage-517rc8
     vdso=1
     ring3mwait=disable

Fixes: 2aae950b21 ("x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu")
Fixes: 77b52b4c5c ("x86: add "debugpat" boot option")
Fixes: e16fd002af ("x86/cpufeature: Enable RING3MWAIT for Knights Landing")
Fixes: b8ce335906 ("x86_64: convert to clock events")
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/20220314012725.26661-1-rdunlap@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Randy Dunlap 2022-03-13 18:27:25 -07:00 committed by Greg Kroah-Hartman
parent 940b12435b
commit 35abf2081f
4 changed files with 4 additions and 4 deletions
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2
arch/x86/entry/vdso/vma.c
View File

@ -440,7 +440,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
static __init int vdso_setup(char *s)
{
vdso64_enabled = simple_strtoul(s, NULL, 0);
return 0;
return 1;
}
__setup("vdso=", vdso_setup);

2
arch/x86/kernel/apic/apic.c
View File

@ -168,7 +168,7 @@ static __init int setup_apicpmtimer(char *s)
{
apic_calibrate_pmtmr = 1;
notsc_setup(NULL);
return 0;
return 1;
}
__setup("apicpmtimer", setup_apicpmtimer);
#endif

2
arch/x86/kernel/cpu/intel.c
View File

@ -88,7 +88,7 @@ static bool ring3mwait_disabled __read_mostly;
static int __init ring3mwait_disable(char *__unused)
{
ring3mwait_disabled = true;
return 0;
return 1;
}
__setup("ring3mwait=disable", ring3mwait_disable);

2
arch/x86/mm/pat/memtype.c
View File

@ -101,7 +101,7 @@ int pat_debug_enable;
static int __init pat_debug_setup(char *str)
{
pat_debug_enable = 1;
return 0;
return 1;
}
__setup("debugpat", pat_debug_setup);