Josh Poimboeuf
9a7c348ba6
ftrace: Add return address pointer to ftrace_ret_stack
...
Storing this value will help prevent unwinders from getting out of sync
with the function graph tracer ret_stack. Now instead of needing a
stateful iterator, they can compare the return address pointer to find
the right ret_stack entry.
Note that an array of 50 ftrace_ret_stack structs is allocated for every
task. So when an arch implements this, it will add either 200 or 400
bytes of memory usage per task (depending on whether it's a 32-bit or
64-bit platform).
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com >
Acked-by: Steven Rostedt <rostedt@goodmis.org >
Cc: Andy Lutomirski <luto@amacapital.net >
Cc: Andy Lutomirski <luto@kernel.org >
Cc: Borislav Petkov <bp@alien8.de >
Cc: Brian Gerst <brgerst@gmail.com >
Cc: Byungchul Park <byungchul.park@lge.com >
Cc: Denys Vlasenko <dvlasenk@redhat.com >
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: H. Peter Anvin <hpa@zytor.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Nilay Vaish <nilayvaish@gmail.com >
Cc: Peter Zijlstra <peterz@infradead.org >
Cc: Thomas Gleixner <tglx@linutronix.de >
Link: http://lkml.kernel.org/r/a95cfcc39e8f26b89a430c56926af0bb217bc0a1.1471607358.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org >
2016-08-24 12:15:14 +02:00
Jiri Slaby
3a36cb11ca
ftrace: Do not pass data to ftrace_dyn_arch_init
...
As the data parameter is not really used by any ftrace_dyn_arch_init,
remove that from ftrace_dyn_arch_init. This also removes the addr
local variable from ftrace_init which is now unused.
Note the documentation was imprecise as it did not suggest to set
(*data) to 0.
Link: http://lkml.kernel.org/r/1393268401-24379-4-git-send-email-jslaby@suse.cz
Cc: Frederic Weisbecker <fweisbec@gmail.com >
Cc: Ingo Molnar <mingo@redhat.com >
Cc: linux-arch@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz >
Signed-off-by: Steven Rostedt <rostedt@goodmis.org >
2014-03-07 10:06:14 -05:00
Jiri Slaby
af64a7cb09
ftrace: Pass retval through return in ftrace_dyn_arch_init()
...
No architecture uses the "data" parameter in ftrace_dyn_arch_init() in any
way, it just sets the value to 0. And this is used as a return value
in the caller -- ftrace_init, which just checks the retval against
zero.
Note there is also "return 0" in every ftrace_dyn_arch_init. So it is
enough to check the retval and remove all the indirect sets of data on
all archs.
Link: http://lkml.kernel.org/r/1393268401-24379-3-git-send-email-jslaby@suse.cz
Cc: linux-arch@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz >
Signed-off-by: Steven Rostedt <rostedt@goodmis.org >
2014-03-07 10:06:13 -05:00
Arun Sharma
60063497a9
atomic: use <linux/atomic.h>
...
This allows us to move duplicated code in <asm/atomic.h>
(atomic_inc_not_zero() for now) to <linux/atomic.h>
Signed-off-by: Arun Sharma <asharma@fb.com >
Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com >
Cc: Ingo Molnar <mingo@elte.hu >
Cc: David Miller <davem@davemloft.net >
Cc: Eric Dumazet <eric.dumazet@gmail.com >
Acked-by: Mike Frysinger <vapier@gentoo.org >
Signed-off-by: Andrew Morton <akpm@linux-foundation.org >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
2011-07-26 16:49:47 -07:00
Mike Frysinger
f507442962
Blackfin: add support for dynamic ftrace
...
Signed-off-by: Mike Frysinger <vapier@gentoo.org >
2010-08-06 12:55:54 -04:00
Mike Frysinger
b73faf7449
Blackfin: support new ftrace frame pointer semantics
...
Signed-off-by: Mike Frysinger <vapier@gentoo.org >
2010-03-09 00:30:50 -05:00
Mike Frysinger
3289651a97
Blackfin: update ftrace_push_return_trace() breakage
...
Commit 71e308a239vapier@gentoo.org >
2009-09-16 22:10:47 -04:00
Mike Frysinger
1ee76d7e16
Blackfin: initial support for ftrace grapher
...
Signed-off-by: Mike Frysinger <vapier@gentoo.org >
2009-06-13 07:20:16 -04:00
