Messages in this thread | | | Date | Mon, 15 Aug 2022 11:15:16 +0900 | From | Sergey Senozhatsky <> | Subject | Re: [PATCH] printk: Export log_buf_len to userland |
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Cc-ing John and Steven
On (22/08/10 14:25), Marc Aurèle La France wrote: > > Make the kernel log's buffer size available to userland so it can be used with > `dmesg -s`.
And what doesn't work now?
> This change is not eligible for stable@. > > Please Reply-To-All. > > Thanks and have a great day. > > Marc.
These lines don't belong here. Please see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.0-rc1
> Signed-off-by: Marc Aurèle La France <tsi@tuyoix.net> > > diff -aNpRruz -X /etc/diff.excludes linux-5.17.1/include/linux/printk.h devel-5.17.1/include/linux/printk.h > --- linux-5.17.1/include/linux/printk.h 2022-03-28 02:03:22.000000000 -0600 > +++ devel-5.17.1/include/linux/printk.h 2022-03-28 07:14:10.803008293 -0600 > @@ -318,6 +337,7 @@ extern void __printk_cpu_unlock(void); > #endif /* CONFIG_SMP */ > > extern int kptr_restrict; > +extern u32 log_buf_len; > > /** > * pr_fmt - used by the pr_*() macros to generate the printk format string > diff -aNpRruz -X /etc/diff.excludes linux-5.17.1/kernel/printk/printk.c devel-5.17.1/kernel/printk/printk.c > --- linux-5.17.1/kernel/printk/printk.c 2022-03-28 02:03:22.000000000 -0600 > +++ devel-5.17.1/kernel/printk/printk.c 2022-03-28 07:14:10.803008293 -0600 > @@ -404,7 +404,7 @@ static struct latched_seq clear_seq = { > #define LOG_BUF_LEN_MAX (u32)(1 << 31) > static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN); > static char *log_buf = __log_buf; > -static u32 log_buf_len = __LOG_BUF_LEN; > +u32 log_buf_len = __LOG_BUF_LEN; > > /* > * Define the average message size. This only affects the number of > diff -aNpRruz -X /etc/diff.excludes linux-5.17.1/kernel/printk/sysctl.c devel-5.17.1/kernel/printk/sysctl.c > --- linux-5.17.1/kernel/printk/sysctl.c 2022-03-28 02:03:22.000000000 -0600 > +++ devel-5.17.1/kernel/printk/sysctl.c 2022-03-28 07:14:10.803008293 -0600 > @@ -22,6 +22,13 @@ static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, > > static struct ctl_table printk_sysctls[] = { > { > + .procname = "log_buf_len", > + .data = &log_buf_len, > + .maxlen = sizeof(u32), > + .mode = 0444, > + .proc_handler = proc_dointvec, > + }, > + { > .procname = "printk", > .data = &console_loglevel, > .maxlen = 4*sizeof(int),
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