mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-03-08 00:05:29 +07:00
ca7c6076ba
timer_irq_works() is used to detects the timer IRQs. It calls mdelay(10) to delay ten ticks and check whether the timer IRQ work or not. mdelay() depends on the loops_per_jiffy which is set up in calibrate_delay(), but the delay calibration depends on a working timer interrupt, which causes a chicken and egg problem. The correct solution is to set up the interrupt mode and making sure that the timer interrupt is delivered correctly before invoking calibrate_delay(). That means that mdelay() cannot be used in timer_irq_works(). Provide helper functions to make a rough delay estimate which is good enough to prove that the timer interrupt is working. Either use TSC or a simple delay loop and assume that 4GHz is the maximum CPU frequency to base the delay calculation on. Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: yinghai@kernel.org Cc: bhe@redhat.com Link: https://lkml.kernel.org/r/1505293975-26005-9-git-send-email-douly.fnst@cn.fujitsu.com |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.