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kcov, usb: hide in_serving_softirq checks in __usb_hcd_giveback_urb 

Done opencode in_serving_softirq() checks in in_serving_softirq() to avoid
cluttering the code, hide them in kcov helpers instead.

Fixes: aee9ddb1d3 ("kcov, usb: only collect coverage from __usb_hcd_giveback_urb in softirq")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://lore.kernel.org/r/aeb430c5bb90b0ccdf1ec302c70831c1a47b9c45.1609876340.git.andreyknvl@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-sugar-mainline-defconfig
Andrey Konovalov 2021-01-05 20:53:42 +01:00 committed by Greg Kroah-Hartman
parent 10a05404c4
commit e89eed02a5
2 changed files with 24 additions and 5 deletions
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8
drivers/usb/core/hcd.c
View File

@ -1649,14 +1649,12 @@ static void __usb_hcd_giveback_urb(struct urb *urb)
urb->status = status;
/*
* This function can be called in task context inside another remote
* coverage collection section, but KCOV doesn't support that kind of
* coverage collection section, but kcov doesn't support that kind of
* recursion yet. Only collect coverage in softirq context for now.
*/
if (in_serving_softirq())
kcov_remote_start_usb((u64)urb->dev->bus->busnum);
kcov_remote_start_usb_softirq((u64)urb->dev->bus->busnum);
urb->complete(urb);
if (in_serving_softirq())
kcov_remote_stop();
kcov_remote_stop_softirq();
usb_anchor_resume_wakeups(anchor);
atomic_dec(&urb->use_count);

21
include/linux/kcov.h
View File

@ -52,6 +52,25 @@ static inline void kcov_remote_start_usb(u64 id)
kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_USB, id));
}
/*
* The softirq flavor of kcov_remote_*() functions is introduced as a temporary
* work around for kcov's lack of nested remote coverage sections support in
* task context. Adding suport for nested sections is tracked in:
* https://bugzilla.kernel.org/show_bug.cgi?id=210337
*/
static inline void kcov_remote_start_usb_softirq(u64 id)
{
if (in_serving_softirq())
kcov_remote_start_usb(id);
}
static inline void kcov_remote_stop_softirq(void)
{
if (in_serving_softirq())
kcov_remote_stop();
}
#else
static inline void kcov_task_init(struct task_struct *t) {}
@ -66,6 +85,8 @@ static inline u64 kcov_common_handle(void)
}
static inline void kcov_remote_start_common(u64 id) {}
static inline void kcov_remote_start_usb(u64 id) {}
static inline void kcov_remote_start_usb_softirq(u64 id) {}
static inline void kcov_remote_stop_softirq(void) {}
#endif /* CONFIG_KCOV */
#endif /* _LINUX_KCOV_H */