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SubjectRe: [TRIVIAL PATCH 16/26] x86: Convert print_symbol to %pSR
On Wed, Dec 12, 2012 at 10:19:05AM -0800, Joe Perches wrote:
> Use the new vsprintf extension to avoid any possible
> message interleaving.
>
> Signed-off-by: Joe Perches <joe@perches.com>
> ---
> arch/x86/kernel/cpu/mcheck/mce.c | 13 +++++++------
> arch/x86/kernel/dumpstack.c | 5 ++---
> arch/x86/kernel/process_32.c | 2 +-
> arch/x86/mm/mmio-mod.c | 4 ++--
> arch/x86/um/sysrq_32.c | 9 +++------
> 5 files changed, 15 insertions(+), 18 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index 80dbda8..996f98a 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -242,13 +242,14 @@ static void print_mce(struct mce *m)
> m->extcpu, m->mcgstatus, m->bank, m->status);
>
> if (m->ip) {
> - pr_emerg(HW_ERR "RIP%s %02x:<%016Lx> ",
> - !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "",
> - m->cs, m->ip);
> -
> if (m->cs == __KERNEL_CS)
> - print_symbol("{%s}", m->ip);
> - pr_cont("\n");
> + pr_emerg(HW_ERR "RIP%s %02x:<%016Lx> {%pSR}\n",
> + !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "",
> + m->cs, m->ip, (void *)m->ip);
> + else
> + pr_emerg(HW_ERR "RIP%s %02x:<%016Lx>\n",
> + !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "",
> + m->cs, m->ip);
> }

I think I'd go ahead and ACK this unless Tony has some comments. I'm not
happy about the two pr_emerg calls based on the conditional.

Or, Tony, what do you think, could we get away if we printed empty
string for when m->cs != __KERNEL_CS? I'm thinking of not breaking any
userspace which is parsing that output and seeing "... {}" in that case.

This assumes that vsprintf can print (void *)0 when passed as an
argument through %pSR. Joe?

Thanks.

--
Regards/Gruss,
Boris.

Sent from a fat crate under my desk. Formatting is fine.
--


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