linux-kernel - Re: [PATCH] instrumented.h: fix all kernel-doc format warnings

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Date:   Mon, 27 Feb 2023 07:04:37 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Marco Elver <elver@...gle.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] instrumented.h: fix all kernel-doc format warnings

On Mon, Feb 27, 2023 at 09:12:53AM +0100, Marco Elver wrote:
> On Mon, 27 Feb 2023 at 02:17, Randy Dunlap <rdunlap@...radead.org> wrote:
> >
> > Fix 26 kernel-doc notation warnings by converting the function
> > documentation to kernel-doc format.
> >
> > Warning example:
> >
> > instrumented.h:155: warning: Function parameter or member 'to' not described in 'instrument_copy_from_user_after'
> > instrumented.h:155: warning: Function parameter or member 'from' not described in 'instrument_copy_from_user_after'
> > instrumented.h:155: warning: Function parameter or member 'n' not described in 'instrument_copy_from_user_after'
> > instrumented.h:155: warning: Function parameter or member 'left' not described in 'instrument_copy_from_user_after'
> >
> > Fixes: 36e4d4dd4fc4 ("include/linux: Add instrumented.h infrastructure")
> > Fixes: 00047c2e6d7c ("instrumented.h: Introduce read-write instrumentation hooks")
> > Fixes: 33b75c1d884e ("instrumented.h: allow instrumenting both sides of copy_from_user()")
> > Fixes: 888f84a6da4d ("x86: asm: instrument usercopy in get_user() and put_user()")
> > Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: Marco Elver <elver@...gle.com>
> > Cc: Alexander Potapenko <glider@...gle.com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Dmitry Vyukov <dvyukov@...gle.com>
> > Cc: Paul E. McKenney <paulmck@...nel.org>
> > Cc: Ingo Molnar <mingo@...nel.org>
> 
> Reviewed-by: Marco Elver <elver@...gle.com>
> 
> Thanks for the fixes.

I pulled this in for v6.4, thank you both!

							Thanx, Paul

> > ---
> >  include/linux/instrumented.h |   63 +++++++++++++--------------------
> >  1 file changed, 26 insertions(+), 37 deletions(-)
> >
> > diff -- a/include/linux/instrumented.h b/include/linux/instrumented.h
> > --- a/include/linux/instrumented.h
> > +++ b/include/linux/instrumented.h
> > @@ -15,12 +15,11 @@
> >
> >  /**
> >   * instrument_read - instrument regular read access
> > + * @v: address of access
> > + * @size: size of access
> >   *
> >   * Instrument a regular read access. The instrumentation should be inserted
> >   * before the actual read happens.
> > - *
> > - * @ptr address of access
> > - * @size size of access
> >   */
> >  static __always_inline void instrument_read(const volatile void *v, size_t size)
> >  {
> > @@ -30,12 +29,11 @@ static __always_inline void instrument_r
> >
> >  /**
> >   * instrument_write - instrument regular write access
> > + * @v: address of access
> > + * @size: size of access
> >   *
> >   * Instrument a regular write access. The instrumentation should be inserted
> >   * before the actual write happens.
> > - *
> > - * @ptr address of access
> > - * @size size of access
> >   */
> >  static __always_inline void instrument_write(const volatile void *v, size_t size)
> >  {
> > @@ -45,12 +43,11 @@ static __always_inline void instrument_w
> >
> >  /**
> >   * instrument_read_write - instrument regular read-write access
> > + * @v: address of access
> > + * @size: size of access
> >   *
> >   * Instrument a regular write access. The instrumentation should be inserted
> >   * before the actual write happens.
> > - *
> > - * @ptr address of access
> > - * @size size of access
> >   */
> >  static __always_inline void instrument_read_write(const volatile void *v, size_t size)
> >  {
> > @@ -60,12 +57,11 @@ static __always_inline void instrument_r
> >
> >  /**
> >   * instrument_atomic_read - instrument atomic read access
> > + * @v: address of access
> > + * @size: size of access
> >   *
> >   * Instrument an atomic read access. The instrumentation should be inserted
> >   * before the actual read happens.
> > - *
> > - * @ptr address of access
> > - * @size size of access
> >   */
> >  static __always_inline void instrument_atomic_read(const volatile void *v, size_t size)
> >  {
> > @@ -75,12 +71,11 @@ static __always_inline void instrument_a
> >
> >  /**
> >   * instrument_atomic_write - instrument atomic write access
> > + * @v: address of access
> > + * @size: size of access
> >   *
> >   * Instrument an atomic write access. The instrumentation should be inserted
> >   * before the actual write happens.
> > - *
> > - * @ptr address of access
> > - * @size size of access
> >   */
> >  static __always_inline void instrument_atomic_write(const volatile void *v, size_t size)
> >  {
> > @@ -90,12 +85,11 @@ static __always_inline void instrument_a
> >
> >  /**
> >   * instrument_atomic_read_write - instrument atomic read-write access
> > + * @v: address of access
> > + * @size: size of access
> >   *
> >   * Instrument an atomic read-write access. The instrumentation should be
> >   * inserted before the actual write happens.
> > - *
> > - * @ptr address of access
> > - * @size size of access
> >   */
> >  static __always_inline void instrument_atomic_read_write(const volatile void *v, size_t size)
> >  {
> > @@ -105,13 +99,12 @@ static __always_inline void instrument_a
> >
> >  /**
> >   * instrument_copy_to_user - instrument reads of copy_to_user
> > + * @to: destination address
> > + * @from: source address
> > + * @n: number of bytes to copy
> >   *
> >   * Instrument reads from kernel memory, that are due to copy_to_user (and
> >   * variants). The instrumentation must be inserted before the accesses.
> > - *
> > - * @to destination address
> > - * @from source address
> > - * @n number of bytes to copy
> >   */
> >  static __always_inline void
> >  instrument_copy_to_user(void __user *to, const void *from, unsigned long n)
> > @@ -123,13 +116,12 @@ instrument_copy_to_user(void __user *to,
> >
> >  /**
> >   * instrument_copy_from_user_before - add instrumentation before copy_from_user
> > + * @to: destination address
> > + * @from: source address
> > + * @n: number of bytes to copy
> >   *
> >   * Instrument writes to kernel memory, that are due to copy_from_user (and
> >   * variants). The instrumentation should be inserted before the accesses.
> > - *
> > - * @to destination address
> > - * @from source address
> > - * @n number of bytes to copy
> >   */
> >  static __always_inline void
> >  instrument_copy_from_user_before(const void *to, const void __user *from, unsigned long n)
> > @@ -140,14 +132,13 @@ instrument_copy_from_user_before(const v
> >
> >  /**
> >   * instrument_copy_from_user_after - add instrumentation after copy_from_user
> > + * @to: destination address
> > + * @from: source address
> > + * @n: number of bytes to copy
> > + * @left: number of bytes not copied (as returned by copy_from_user)
> >   *
> >   * Instrument writes to kernel memory, that are due to copy_from_user (and
> >   * variants). The instrumentation should be inserted after the accesses.
> > - *
> > - * @to destination address
> > - * @from source address
> > - * @n number of bytes to copy
> > - * @left number of bytes not copied (as returned by copy_from_user)
> >   */
> >  static __always_inline void
> >  instrument_copy_from_user_after(const void *to, const void __user *from,
> > @@ -158,12 +149,11 @@ instrument_copy_from_user_after(const vo
> >
> >  /**
> >   * instrument_get_user() - add instrumentation to get_user()-like macros
> > + * @to: destination variable, may not be address-taken
> >   *
> >   * get_user() and friends are fragile, so it may depend on the implementation
> >   * whether the instrumentation happens before or after the data is copied from
> >   * the userspace.
> > - *
> > - * @to destination variable, may not be address-taken
> >   */
> >  #define instrument_get_user(to)                                \
> >  ({                                                     \
> > @@ -175,14 +165,13 @@ instrument_copy_from_user_after(const vo
> >
> >  /**
> >   * instrument_put_user() - add instrumentation to put_user()-like macros
> > + * @from: source address
> > + * @ptr: userspace pointer to copy to
> > + * @size: number of bytes to copy
> >   *
> >   * put_user() and friends are fragile, so it may depend on the implementation
> >   * whether the instrumentation happens before or after the data is copied from
> >   * the userspace.
> > - *
> > - * @from source address
> > - * @ptr userspace pointer to copy to
> > - * @size number of bytes to copy
> >   */
> >  #define instrument_put_user(from, ptr, size)                   \
> >  ({                                                             \