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printk: move dictionary keys to dev_printk_info

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Dictionaries are only used for SUBSYSTEM and DEVICE properties. The
current implementation stores the property names each time they are
used. This requires more space than otherwise necessary. Also,
because the dictionary entries are currently considered optional,
it cannot be relied upon that they are always available, even if the
writer wanted to store them. These issues will increase should new
dictionary properties be introduced.

Rather than storing the subsystem and device properties in the
dict ring, introduce a struct dev_printk_info with separate fields
to store only the property values. Embed this struct within the
struct printk_info to provide guaranteed availability.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/87mu1jl6ne.fsf@jogness.linutronix.de
This commit is contained in:
John Ogness
2020-09-21 13:24:45 +02:06
committed by Petr Mladek
parent cfe2790b16
commit 74caba7f2a
9 changed files with 172 additions and 168 deletions
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6
include/linux/printk.h
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@@ -158,10 +158,12 @@ static inline void printk_nmi_direct_enter(void) { }
static inline void printk_nmi_direct_exit(void) { }
#endif /* PRINTK_NMI */
struct dev_printk_info;
#ifdef CONFIG_PRINTK
asmlinkage __printf(5, 0)
asmlinkage __printf(4, 0)
int vprintk_emit(int facility, int level,
const char *dict, size_t dictlen,
const struct dev_printk_info *dev_info,
const char *fmt, va_list args);
asmlinkage __printf(1, 0)