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kay at vrfy May 10, 2012, 6:23 PM Views: 145 Permalink Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer [In reply to] On Fri, 2012-05-11 at 02:38 +0200, Kay Sievers wrote: > On Thu, May 10, 2012 at 10:52 PM, Linus Torvalds <torvalds [at] linux-foundation> wrote: > > > The change to verify that 'current' matches the previous printout is > > so far the *only* sane semantic change I've seen in this thread. > > Everything else has been pure garbage. > > Ok, let's continue with sane things then. :) > > Here is a stupid kernel module which creates 3 racy printk() loops, 2 of > them do continuation, one does an atomic print. The continuation one > prints one char per printk. > http://people.freedesktop.org/~kay/printk-race/printk-race.c > > The lines all try to look like: > (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) > (CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC) > (XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX) > > Every loop has it's own uppercase character. The line enclosed in '()'. > 'A' is the atomic one, the cont ones are 'C' and 'X'. Having only one continuation user racing against an atomic printk user looks like this: Current kernel: [ 54.062900] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.068200] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.071698] (CC(AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.074103] C(AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.076052] C(AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.078116] C(AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.080096] C(AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.082060] CC(AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 54.086121] C(AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) http://people.freedesktop.org/~kay/printk-race/printk-out-before-2.txt Record buffer, with cont buffer owner: [ 33.431129] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.435112] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.439131] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.441820] (CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC) [ 33.445292] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.450131] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.453127] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.456084] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.459143] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.462161] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) [ 33.465165] (AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA) http://people.freedesktop.org/~kay/printk-race/printk-out-after-2.txt Kay -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo [at] vger More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/

Subject User Time [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 2, 2012, 5:29 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer peterz at infradead May 3, 2012, 12:48 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 3, 2012, 12:54 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 3, 2012, 12:56 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer peterz at infradead May 3, 2012, 12:55 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer peterz at infradead May 3, 2012, 1:02 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 3, 2012, 1:09 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer peterz at infradead May 3, 2012, 1:11 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer greg at kroah May 3, 2012, 1:18 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer levinsasha928 at gmail May 8, 2012, 1:48 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 8, 2012, 4:14 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer levinsasha928 at gmail May 8, 2012, 6:33 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 8, 2012, 8:52 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 8, 2012, 7:29 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 8, 2012, 8:33 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer levinsasha928 at gmail May 8, 2012, 8:57 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 8, 2012, 9:27 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer greg at kroah May 8, 2012, 3:57 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 8, 2012, 9:06 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer levinsasha928 at gmail May 8, 2012, 9:11 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 8, 2012, 9:27 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 8, 2012, 9:36 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer mingo at kernel May 9, 2012, 12:07 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 9, 2012, 6:21 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 9, 2012, 6:29 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 9, 2012, 2:38 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 9, 2012, 6:50 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 9, 2012, 7:37 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer yinghai at kernel May 9, 2012, 4:02 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer greg at kroah May 9, 2012, 4:06 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 9, 2012, 7:30 PM             Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer levinsasha928 at gmail May 11, 2012, 3:35 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 9, 2012, 5:54 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 9, 2012, 6:18 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 9, 2012, 7:32 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 9, 2012, 7:46 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 9:39 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 10, 2012, 9:47 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer tony.luck at gmail May 10, 2012, 11:49 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 12:09 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer tytso at mit May 10, 2012, 1:14 PM             Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 10, 2012, 1:37 PM                 Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 1:39 PM             Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 1:38 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 10, 2012, 1:46 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 10, 2012, 1:52 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 2:01 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 10, 2012, 2:11 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 2:15 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 10, 2012, 2:58 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 10, 2012, 5:13 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 5:38 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 10, 2012, 6:23 PM             Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 14, 2012, 11:46 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer gregkh at linuxfoundation May 11, 2012, 8:19 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer levinsasha928 at gmail May 11, 2012, 8:22 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 11, 2012, 8:35 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 11, 2012, 8:40 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 11, 2012, 8:47 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kernel at teksavvy May 11, 2012, 12:51 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 11, 2012, 1:02 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer levinsasha928 at gmail May 12, 2012, 12:43 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kernel at teksavvy May 12, 2012, 11:04 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 12, 2012, 11:35 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 13, 2012, 4:08 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kernel at teksavvy May 13, 2012, 6:22 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation May 13, 2012, 11:01 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer valdis.kletnieks at vt May 14, 2012, 9:40 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 13, 2012, 2:30 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 13, 2012, 2:48 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kernel at teksavvy May 13, 2012, 3:19 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer hpa at kernel May 16, 2012, 8:44 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer anton.vorontsov at linaro May 26, 2012, 4:11 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 27, 2012, 7:23 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 29, 2012, 9:07 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 29, 2012, 9:14 AM             Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 29, 2012, 9:34 AM         RE: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer tony.luck at intel May 29, 2012, 10:11 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer greg at kroah Jun 5, 2012, 11:33 PM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer gregkh at linuxfoundation Jun 14, 2012, 5:04 PM             Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer cbouatmailru at gmail Jun 14, 2012, 6:31 PM             Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy Jun 15, 2012, 5:07 AM                 Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer mingo at kernel Jun 15, 2012, 5:23 AM                     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer gregkh at linuxfoundation Jun 15, 2012, 2:53 PM                 Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer anton.vorontsov at linaro Jun 15, 2012, 5:23 AM                 Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer tony.luck at gmail Jun 15, 2012, 1:54 PM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer joe at perches May 29, 2012, 9:51 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 29, 2012, 10:22 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy May 30, 2012, 4:29 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer mtk.manpages at gmail Nov 28, 2012, 5:33 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy Nov 28, 2012, 8:22 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer torvalds at linux-foundation Nov 28, 2012, 8:37 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy Nov 28, 2012, 8:49 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy Nov 28, 2012, 9:51 AM         Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer mtk.manpages at gmail Nov 29, 2012, 5:18 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy Nov 29, 2012, 5:28 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer mtk.manpages at gmail Nov 29, 2012, 5:37 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy Nov 29, 2012, 6:08 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer mtk.manpages at gmail Nov 29, 2012, 6:18 AM     Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer kay at vrfy Nov 29, 2012, 6:31 AM

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