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| author | Andy Lutomirski <luto@amacapital.net> | 2014-09-05 15:13:53 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-09-08 14:13:59 -0700 |
| commit | fd143b210e685f0c4b37895f03fb79cd0555b00d (patch) | |
| tree | 6e05e277c6a9f6cffde189ef7375996813a4f231 /arch/x86/include/asm/ptrace.h | |
| parent | 81f49a8fd7088cfcb588d182eeede862c0e3303e (diff) | |
| download | linux-stable-fd143b210e685f0c4b37895f03fb79cd0555b00d.tar.gz linux-stable-fd143b210e685f0c4b37895f03fb79cd0555b00d.tar.bz2 linux-stable-fd143b210e685f0c4b37895f03fb79cd0555b00d.zip | |
x86, entry: Only call user_exit if TIF_NOHZ
The RCU context tracking code requires that arch code call
user_exit() on any entry into kernel code if TIF_NOHZ is set. This
patch adds a check for TIF_NOHZ and a comment to the syscall entry
tracing code.
The main purpose of this patch is to make the code easier to follow:
one can read the body of user_exit and of every function it calls
without finding any explanation of why it's called for traced
syscalls but not for untraced syscalls. This makes it clear when
user_exit() is necessary.
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/0b13e0e24ec0307d67ab7a23b58764f6b1270116.1409954077.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/ptrace.h')
0 files changed, 0 insertions, 0 deletions