Commit-ID: 18ff57b220610a699947f20b156a8245ca7eee98 Gitweb: https://git.kernel.org/tip/18ff57b220610a699947f20b156a8245ca7eee98 Author: Jiri Olsa <jo...@kernel.org> AuthorDate: Mon, 12 Mar 2018 14:45:44 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 13 Mar 2018 06:56:08 +0100
hw_breakpoint: Factor out __modify_user_hw_breakpoint() function Moving out all the functionality without the events disabling/enabling calls, because we want to call another disabling/enabling functions in following change. Signed-off-by: Jiri Olsa <jo...@kernel.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: David Ahern <dsah...@gmail.com> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: Hari Bathini <hbath...@linux.vnet.ibm.com> Cc: Jin Yao <yao....@linux.intel.com> Cc: Jiri Olsa <jo...@redhat.com> Cc: Kan Liang <kan.li...@intel.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Michael Ellerman <m...@ellerman.id.au> Cc: Milind Chabbi <chabbi.mil...@gmail.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Oleg Nesterov <onest...@redhat.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Will Deacon <will.dea...@arm.com> Link: http://lkml.kernel.org/r/20180312134548.31532-5-jo...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- kernel/events/hw_breakpoint.c | 46 +++++++++++++++++++++++++++---------------- 1 file changed, 29 insertions(+), 17 deletions(-) diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c index 776948beb4ac..a556aba223da 100644 --- a/kernel/events/hw_breakpoint.c +++ b/kernel/events/hw_breakpoint.c @@ -456,6 +456,33 @@ register_user_hw_breakpoint(struct perf_event_attr *attr, } EXPORT_SYMBOL_GPL(register_user_hw_breakpoint); +static int __modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr) +{ + u64 old_addr = bp->attr.bp_addr; + u64 old_len = bp->attr.bp_len; + int old_type = bp->attr.bp_type; + bool modify = attr->bp_type != old_type; + int err = 0; + + bp->attr.bp_addr = attr->bp_addr; + bp->attr.bp_type = attr->bp_type; + bp->attr.bp_len = attr->bp_len; + + err = validate_hw_breakpoint(bp); + if (!err && modify) + err = modify_bp_slot(bp, old_type); + + if (err) { + bp->attr.bp_addr = old_addr; + bp->attr.bp_type = old_type; + bp->attr.bp_len = old_len; + return err; + } + + bp->attr.disabled = attr->disabled; + return 0; +} + /** * modify_user_hw_breakpoint - modify a user-space hardware breakpoint * @bp: the breakpoint structure to modify @@ -465,11 +492,7 @@ EXPORT_SYMBOL_GPL(register_user_hw_breakpoint); */ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr) { - u64 old_addr = bp->attr.bp_addr; - u64 old_len = bp->attr.bp_len; - int old_type = bp->attr.bp_type; - bool modify = attr->bp_type != old_type; - int err = 0; + int err; /* * modify_user_hw_breakpoint can be invoked with IRQs disabled and hence it @@ -482,18 +505,9 @@ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *att else perf_event_disable(bp); - bp->attr.bp_addr = attr->bp_addr; - bp->attr.bp_type = attr->bp_type; - bp->attr.bp_len = attr->bp_len; - - err = validate_hw_breakpoint(bp); - if (!err && modify) - err = modify_bp_slot(bp, old_type); + err = __modify_user_hw_breakpoint(bp, attr); if (err) { - bp->attr.bp_addr = old_addr; - bp->attr.bp_type = old_type; - bp->attr.bp_len = old_len; if (!bp->attr.disabled) perf_event_enable(bp); @@ -502,8 +516,6 @@ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *att if (!attr->disabled) perf_event_enable(bp); - - bp->attr.disabled = attr->disabled; return 0; } EXPORT_SYMBOL_GPL(modify_user_hw_breakpoint);
