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[PATCH] x86_64: Only do the clustered systems have unsynchronized TSC assumption on IBM systems

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Big Unisys systems have multiple clusters too, but they have an
synchronized TSC.

I'm using the SMBIOS to check for vendor == IBM.

Cc: Chris McDermott <lcm@us.ibm.com>
Cc: "Protasevich, Natalie" <Natalie.Protasevich@unisys.com>

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-02-26 04:18:31 +01:00 • committed by Linus Torvalds
commit 13a229abc2
3 changed files with 22 additions and 4 deletions
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14
include/asm-x86_64/acpi.h
View file

@ -164,6 +164,20 @@ extern u8 x86_acpiid_to_apicid[];
extern int acpi_skip_timer_override;
extern int unsync_tsc_on_multicluster;
static inline int acpi_madt_oem_check(char *oem, char *productid)
{
/* Copied from i386. Probably has too many entries. */
if (!strncmp(oem, "IBM ENSW", 8) &&
(!strncmp(productid, "VIGIL SMP", 9)
|| !strncmp(productid, "EXA", 3)
|| !strncmp(productid, "RUTHLESS SMP", 12))) {
unsync_tsc_on_multicluster = 1;
}
return 0;
}
#endif /*__KERNEL__*/
#endif /*_ASM_ACPI_H*/