From 13a229abc25640813f1480c0478dfc6bdbc1c19e Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Sun, 26 Feb 2006 04:18:31 +0100 Subject: [PATCH] x86_64: Only do the clustered systems have unsynchronized TSC assumption on IBM systems 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 Cc: "Protasevich, Natalie" Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-x86_64/acpi.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'include') diff --git a/include/asm-x86_64/acpi.h b/include/asm-x86_64/acpi.h index aa1c7b2e438..e2b9923189a 100644 --- a/include/asm-x86_64/acpi.h +++ b/include/asm-x86_64/acpi.h @@ -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*/ -- cgit v1.2.3