| Message ID | 20171211125025.2270-12-sergey.senozhatsky@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
From: Sergey Senozhatsky > Sent: 11 December 2017 12:50 > print_symbol() uses extra stack space to sprintf() symbol > information and then to feed that buffer to printk() > > char buffer[KSYM_SYMBOL_LEN]; > > sprint_symbol(buffer, address); > printk(fmt, buffer); > > Replace print_symbol() with a direct printk("%pS") call. > > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > --- > kernel/irq/debug.h | 8 +++----- > 1 file changed, 3 insertions(+), 5 deletions(-) > > diff --git a/kernel/irq/debug.h b/kernel/irq/debug.h > index 17f05ef8f575..5766e15c1160 100644 > --- a/kernel/irq/debug.h > +++ b/kernel/irq/debug.h ... > @@ -15,13 +13,13 @@ static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc) > printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n", > irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); > printk("->handle_irq(): %p, ", desc->handle_irq); > - print_symbol("%s\n", (unsigned long)desc->handle_irq); > + pr_cont("%pS\n", desc->handle_irq); Looks like you can (and should) use a single printk() instead of pr_cont. David
On (12/11/17 12:55), David Laight wrote: > > kernel/irq/debug.h | 8 +++----- > > 1 file changed, 3 insertions(+), 5 deletions(-) > > > > diff --git a/kernel/irq/debug.h b/kernel/irq/debug.h > > index 17f05ef8f575..5766e15c1160 100644 > > --- a/kernel/irq/debug.h > > +++ b/kernel/irq/debug.h > ... > > @@ -15,13 +13,13 @@ static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc) > > printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n", > > irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); > > printk("->handle_irq(): %p, ", desc->handle_irq); > > - print_symbol("%s\n", (unsigned long)desc->handle_irq); > > + pr_cont("%pS\n", desc->handle_irq); > > Looks like you can (and should) use a single printk() instead of pr_cont. thanks, good point. those pr_cont()-s basically just replicate the old behaviour; but it'll be better to get tid of them. will follow up shortly. -ss
diff --git a/kernel/irq/debug.h b/kernel/irq/debug.h index 17f05ef8f575..5766e15c1160 100644 --- a/kernel/irq/debug.h +++ b/kernel/irq/debug.h @@ -3,8 +3,6 @@ * Debugging printout: */ -#include <linux/kallsyms.h> - #define ___P(f) if (desc->status_use_accessors & f) printk("%14s set\n", #f) #define ___PS(f) if (desc->istate & f) printk("%14s set\n", #f) /* FIXME */ @@ -15,13 +13,13 @@ static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc) printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n", irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); printk("->handle_irq(): %p, ", desc->handle_irq); - print_symbol("%s\n", (unsigned long)desc->handle_irq); + pr_cont("%pS\n", desc->handle_irq); printk("->irq_data.chip(): %p, ", desc->irq_data.chip); - print_symbol("%s\n", (unsigned long)desc->irq_data.chip); + pr_cont("%pS\n", desc->irq_data.chip); printk("->action(): %p\n", desc->action); if (desc->action) { printk("->action->handler(): %p, ", desc->action->handler); - print_symbol("%s\n", (unsigned long)desc->action->handler); + pr_cont("%pS\n", desc->action->handler); } ___P(IRQ_LEVEL);
print_symbol() uses extra stack space to sprintf() symbol information and then to feed that buffer to printk() char buffer[KSYM_SYMBOL_LEN]; sprint_symbol(buffer, address); printk(fmt, buffer); Replace print_symbol() with a direct printk("%pS") call. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> --- kernel/irq/debug.h | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)