This reverts commit b65b70ba068b7cdbfeb65eee87cce84a74618603, which was upstream commit 4a6c91fbdef846ec7250b82f2eeeb87ac5f18cf9.
On Tue, Jun 25, 2019 at 09:39:45AM +0200, Sebastian Andrzej Siewior wrote:
Please backport commit e74deb11931ff682b59d5b9d387f7115f689698e to stable _or_ revert the backport of commit 4a6c91fbdef84 ("x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP"). It uses user_access_{save|restore}() which has been introduced in the following commit.
Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/trace/trace_branch.c | 4 ---- 1 file changed, 4 deletions(-)
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c index 3ea65cdff30d..4ad967453b6f 100644 --- a/kernel/trace/trace_branch.c +++ b/kernel/trace/trace_branch.c @@ -205,8 +205,6 @@ void trace_likely_condition(struct ftrace_likely_data *f, int val, int expect) void ftrace_likely_update(struct ftrace_likely_data *f, int val, int expect, int is_constant) { - unsigned long flags = user_access_save(); - /* A constant is always correct */ if (is_constant) { f->constant++; @@ -225,8 +223,6 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, f->data.correct++; else f->data.incorrect++; - - user_access_restore(flags); } EXPORT_SYMBOL(ftrace_likely_update);