linux-kernel - why kernel implement "udelay" by cpu instructions?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <3a665c760911011913q268b010cqb5da4f79df995b9b@mail.gmail.com>
Date:	Mon, 2 Nov 2009 11:13:51 +0800
From:	loody <miloody@...il.com>
To:	linux-kernel@...r.kernel.org,
	Kernel Newbies <kernelnewbies@...linux.org>
Subject: why kernel implement "udelay" by cpu instructions?

Dear all:
I find the kernel use cpu instruction to implement the udelay function
as keeping decrease a big counter by 1.

If I search the right place in kernel, why kernel does so?
the precision will be different if cpu runs faster or slower, right?
appreciate your help,
miloody
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/