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| author | Andy Lutomirski <[email protected]> | 2015-01-31 12:53:53 +0000 |
|---|---|---|
| committer | Andy Lutomirski <[email protected]> | 2015-02-01 12:02:53 +0000 |
| commit | b926e6f61a26036ee9eabe6761483954d481ad25 (patch) | |
| tree | 0ed87a7d7acc4e8f6e1e443f032b2444fd8eaa1e /lib/mpi/mpi-cmp.c | |
| parent | Merge tag 'pr-20150114-x86-entry' of git://git.kernel.org/pub/scm/linux/kerne... (diff) | |
| download | kernel-b926e6f61a26036ee9eabe6761483954d481ad25.tar.gz kernel-b926e6f61a26036ee9eabe6761483954d481ad25.zip | |
x86, traps: Fix ist_enter from userspace
context_tracking_user_exit() has no effect if in_interrupt() returns true,
so ist_enter() didn't work. Fix it by calling exception_enter(), and thus
context_tracking_user_exit(), before incrementing the preempt count.
This also adds an assertion that will catch the problem reliably if
CONFIG_PROVE_RCU=y to help prevent the bug from being reintroduced.
Link: http://lkml.kernel.org/r/261ebee6aee55a4724746d0d7024697013c40a08.1422709102.git.luto@amacapital.net
Fixes: 959274753857 x86, traps: Track entry into and exit from IST context
Reported-and-tested-by: Sasha Levin <[email protected]>
Signed-off-by: Andy Lutomirski <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-cmp.c')
0 files changed, 0 insertions, 0 deletions