• Frederic Weisbecker's avatar
    tracing/core: bring back raw trace_printk for dynamic formats strings · 48ead020
    Frederic Weisbecker authored
    
    
    Impact: fix callsites with dynamic format strings
    
    Since its new binary implementation, trace_printk() internally uses static
    containers for the format strings on each callsites. But the value is
    assigned once at build time, which means that it can't take dynamic
    formats.
    
    So this patch unearthes the raw trace_printk implementation for the callers
    that will need trace_printk to be able to carry these dynamic format
    strings. The trace_printk() macro will use the appropriate implementation
    for each callsite. Most of the time however, the binary implementation will
    still be used.
    
    The other impact of this patch is that mmiotrace_printk() will use the old
    implementation because it calls the low level trace_vprintk and we can't
    guess here whether the format passed in it is dynamic or not.
    
    Some parts of this patch have been written by Steven Rostedt (most notably
    the part that chooses the appropriate implementation for each callsites).
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
    48ead020