x86/timers: Add simple udelay calibration
authorLu Baolu <baolu.lu@linux.intel.com>
Tue, 21 Mar 2017 08:01:29 +0000 (16:01 +0800)
committerIngo Molnar <mingo@kernel.org>
Tue, 21 Mar 2017 11:28:45 +0000 (12:28 +0100)
commitdd759d93f4dd4fd2f345a78ad1223bb3edf3ee7b
tree958cf26fd6ad3b034f345ebdb441c590a141aea0
parent97da3854c526d3a6ee05c849c96e48d21527606c
x86/timers: Add simple udelay calibration

Add a simple udelay calibration in x86 architecture-specific
boot-time initializations. This will get a workable estimate
for loops_per_jiffy. Hence, udelay() could be used after this
initialization.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-usb@vger.kernel.org
Link: http://lkml.kernel.org/r/1490083293-3792-2-git-send-email-baolu.lu@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/setup.c