All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: ak@linux.intel.com
Cc: linux-kernel@vger.kernel.org
Subject: trace name copy/paste in native_write_msr ?
Date: Fri, 3 Jun 2016 11:32:51 +0100	[thread overview]
Message-ID: <20160603103250.GC2265@work-vm> (raw)

Hi Andi,
  In arch/x86/include/asm/msr.h native_write_msr(_safe)
you added a trace test in 7f47d8cc, should the
tracepoint_active's be testing for __tracepoint_write_msr ?

/* Can be uninlined because referenced by paravirt */
notrace static inline void native_write_msr(unsigned int msr,
                                            unsigned low, unsigned high)
{
        asm volatile("1: wrmsr\n"
                     "2:\n"
                     _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_wrmsr_unsafe)
                     : : "c" (msr), "a"(low), "d" (high) : "memory");
        if (msr_tracepoint_active(__tracepoint_read_msr))   <---------------
                do_trace_write_msr(msr, ((u64)high << 32 | low), 0);
}

/* Can be uninlined because referenced by paravirt */
notrace static inline int native_write_msr_safe(unsigned int msr,
                                        unsigned low, unsigned high)
{
        int err; 
        asm volatile("2: wrmsr ; xor %[err],%[err]\n"
                     "1:\n\t"
                     ".section .fixup,\"ax\"\n\t"
                     "3:  mov %[fault],%[err] ; jmp 1b\n\t"
                     ".previous\n\t"
                     _ASM_EXTABLE(2b, 3b)
                     : [err] "=a" (err)
                     : "c" (msr), "0" (low), "d" (high),
                       [fault] "i" (-EIO)
                     : "memory");
        if (msr_tracepoint_active(__tracepoint_read_msr))   <---------------
                do_trace_write_msr(msr, ((u64)high << 32 | low), err);
        return err;
}

Dave

--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

             reply	other threads:[~2016-06-03 10:32 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-03 10:32 Dr. David Alan Gilbert [this message]
2016-06-03 14:29 ` trace name copy/paste in native_write_msr ? Andi Kleen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20160603103250.GC2265@work-vm \
    --to=dgilbert@redhat.com \
    --cc=ak@linux.intel.com \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.