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authorNamhyung Kim <namhyung@gmail.com>2011-03-24 03:42:29 +0100
committerIngo Molnar <mingo@elte.hu>2011-03-24 08:36:10 +0100
commit0f77a8d378254f27df4a114a5da67223af1fe93f (patch)
treeedc37c211adce744100d4776e4a28fb868c8b3c0 /include/asm-generic/cache.h
parentlockdep: Remove unused 'factor' variable from lockdep_stats_show() (diff)
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vsprintf: Introduce %pB format specifier
The %pB format specifier is for stack backtrace. Its handler sprint_backtrace() does symbol lookup using (address-1) to ensure the address will not point outside of the function. If there is a tail-call to the function marked "noreturn", gcc optimized out the code after the call then causes saved return address points outside of the function (i.e. the start of the next function), so pollutes call trace somewhat. This patch adds the %pB printk mechanism that allows architecture call-trace printout functions to improve backtrace printouts. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-arch@vger.kernel.org LKML-Reference: <1300934550-21394-1-git-send-email-namhyung@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-generic/cache.h')
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