On Mon, Dec 11, 2017 at 09:50:20PM +0900, Sergey Senozhatsky wrote:
> 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 at gmail.com>
> Cc: Tony Luck <tony.luck at intel.com>
> Cc: Borislav Petkov <bp at alien8.de>
> Cc: Thomas Gleixner <tglx at linutronix.de>
> ---
> arch/x86/kernel/cpu/mcheck/mce.c | 3 +--
> arch/x86/mm/mmio-mod.c | 5 ++---
> 2 files changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index b1d616d08eee..8ca8f6eb32db 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -14,7 +14,6 @@
> #include <linux/capability.h>
> #include <linux/miscdevice.h>
> #include <linux/ratelimit.h>
> -#include <linux/kallsyms.h>
> #include <linux/rcupdate.h>
> #include <linux/kobject.h>
> #include <linux/uaccess.h>
> @@ -235,7 +234,7 @@ static void __print_mce(struct mce *m)
> m->cs, m->ip);
>
> if (m->cs == __KERNEL_CS)
> - print_symbol("{%s}", m->ip);
> + pr_cont("{%pS}", (void *)m->ip);
> pr_cont("\n");
> }
>
For the mce.c bit above:
Acked-by: Borislav Petkov <bp at suse.de>
Thx.
--
Regards/Gruss,
Boris.
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