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locking/refcount: move kernel-doc markups to the proper place 

Changeset a435b9a143 ("locking/refcount: Provide __refcount API to obtain the old value")
added a set of functions starting with __ that have a new
parameter, adding a series of new warnings:

	$ ./scripts/kernel-doc -none include/linux/refcount.h
	include/linux/refcount.h:169: warning: Function parameter or member 'oldp' not described in '__refcount_add_not_zero'
	include/linux/refcount.h:208: warning: Function parameter or member 'oldp' not described in '__refcount_add'
	include/linux/refcount.h:239: warning: Function parameter or member 'oldp' not described in '__refcount_inc_not_zero'
	include/linux/refcount.h:261: warning: Function parameter or member 'oldp' not described in '__refcount_inc'
	include/linux/refcount.h:291: warning: Function parameter or member 'oldp' not described in '__refcount_sub_and_test'
	include/linux/refcount.h:327: warning: Function parameter or member 'oldp' not described in '__refcount_dec_and_test'
	include/linux/refcount.h:347: warning: Function parameter or member 'oldp' not described in '__refcount_dec'

The issue is that the kernel-doc markups are now misplaced,
as they should be added just before the functions.

So, move the kernel-doc markups to the proper places,
in order to drop the warnings.

It should be noticed that git show produces a crappy output,
for this patch without "--patience" flag.

Fixes: a435b9a143 ("locking/refcount: Provide __refcount API to obtain the old value")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/7985c31d1ace591bc5e1faa05c367f1295b78afd.1603791716.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mauro Carvalho Chehab 2020-10-27 10:51:23 +01:00 committed by Jonathan Corbet
parent e3e7439dbc
commit cf38cc9f1e
1 changed files with 75 additions and 75 deletions
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150
include/linux/refcount.h
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@ -147,24 +147,6 @@ static inline unsigned int refcount_read(const refcount_t *r)
return atomic_read(&r->refs);
}
/**
* refcount_add_not_zero - add a value to a refcount unless it is 0
* @i: the value to add to the refcount
* @r: the refcount
*
* Will saturate at REFCOUNT_SATURATED and WARN.
*
* Provides no memory ordering, it is assumed the caller has guaranteed the
* object memory to be stable (RCU, etc.). It does provide a control dependency
* and thereby orders future stores. See the comment on top.
*
* Use of this function is not recommended for the normal reference counting
* use case in which references are taken and released one at a time. In these
* cases, refcount_inc(), or one of its variants, should instead be used to
* increment a reference count.
*
* Return: false if the passed refcount is 0, true otherwise
*/
static inline __must_check bool __refcount_add_not_zero(int i, refcount_t *r, int *oldp)
{
int old = refcount_read(r);
@ -183,11 +165,42 @@ static inline __must_check bool __refcount_add_not_zero(int i, refcount_t *r, in
return old;
}
/**
* refcount_add_not_zero - add a value to a refcount unless it is 0
* @i: the value to add to the refcount
* @r: the refcount
*
* Will saturate at REFCOUNT_SATURATED and WARN.
*
* Provides no memory ordering, it is assumed the caller has guaranteed the
* object memory to be stable (RCU, etc.). It does provide a control dependency
* and thereby orders future stores. See the comment on top.
*
* Use of this function is not recommended for the normal reference counting
* use case in which references are taken and released one at a time. In these
* cases, refcount_inc(), or one of its variants, should instead be used to
* increment a reference count.
*
* Return: false if the passed refcount is 0, true otherwise
*/
static inline __must_check bool refcount_add_not_zero(int i, refcount_t *r)
{
return __refcount_add_not_zero(i, r, NULL);
}
static inline void __refcount_add(int i, refcount_t *r, int *oldp)
{
int old = atomic_fetch_add_relaxed(i, &r->refs);
if (oldp)
*oldp = old;
if (unlikely(!old))
refcount_warn_saturate(r, REFCOUNT_ADD_UAF);
else if (unlikely(old < 0 || old + i < 0))
refcount_warn_saturate(r, REFCOUNT_ADD_OVF);
}
/**
* refcount_add - add a value to a refcount
* @i: the value to add to the refcount
@ -204,24 +217,16 @@ static inline __must_check bool refcount_add_not_zero(int i, refcount_t *r)
* cases, refcount_inc(), or one of its variants, should instead be used to
* increment a reference count.
*/
static inline void __refcount_add(int i, refcount_t *r, int *oldp)
{
int old = atomic_fetch_add_relaxed(i, &r->refs);
if (oldp)
*oldp = old;
if (unlikely(!old))
refcount_warn_saturate(r, REFCOUNT_ADD_UAF);
else if (unlikely(old < 0 || old + i < 0))
refcount_warn_saturate(r, REFCOUNT_ADD_OVF);
}
static inline void refcount_add(int i, refcount_t *r)
{
__refcount_add(i, r, NULL);
}
static inline __must_check bool __refcount_inc_not_zero(refcount_t *r, int *oldp)
{
return __refcount_add_not_zero(1, r, oldp);
}
/**
* refcount_inc_not_zero - increment a refcount unless it is 0
* @r: the refcount to increment
@ -235,16 +240,16 @@ static inline void refcount_add(int i, refcount_t *r)
*
* Return: true if the increment was successful, false otherwise
*/
static inline __must_check bool __refcount_inc_not_zero(refcount_t *r, int *oldp)
{
return __refcount_add_not_zero(1, r, oldp);
}
static inline __must_check bool refcount_inc_not_zero(refcount_t *r)
{
return __refcount_inc_not_zero(r, NULL);
}
static inline void __refcount_inc(refcount_t *r, int *oldp)
{
__refcount_add(1, r, oldp);
}
/**
* refcount_inc - increment a refcount
* @r: the refcount to increment
@ -257,16 +262,29 @@ static inline __must_check bool refcount_inc_not_zero(refcount_t *r)
* Will WARN if the refcount is 0, as this represents a possible use-after-free
* condition.
*/
static inline void __refcount_inc(refcount_t *r, int *oldp)
{
__refcount_add(1, r, oldp);
}
static inline void refcount_inc(refcount_t *r)
{
__refcount_inc(r, NULL);
}
static inline __must_check bool __refcount_sub_and_test(int i, refcount_t *r, int *oldp)
{
int old = atomic_fetch_sub_release(i, &r->refs);
if (oldp)
*oldp = old;
if (old == i) {
smp_acquire__after_ctrl_dep();
return true;
}
if (unlikely(old < 0 || old - i < 0))
refcount_warn_saturate(r, REFCOUNT_SUB_UAF);
return false;
}
/**
* refcount_sub_and_test - subtract from a refcount and test if it is 0
* @i: amount to subtract from the refcount
@ -287,29 +305,16 @@ static inline void refcount_inc(refcount_t *r)
*
* Return: true if the resulting refcount is 0, false otherwise
*/
static inline __must_check bool __refcount_sub_and_test(int i, refcount_t *r, int *oldp)
{
int old = atomic_fetch_sub_release(i, &r->refs);
if (oldp)
*oldp = old;
if (old == i) {
smp_acquire__after_ctrl_dep();
return true;
}
if (unlikely(old < 0 || old - i < 0))
refcount_warn_saturate(r, REFCOUNT_SUB_UAF);
return false;
}
static inline __must_check bool refcount_sub_and_test(int i, refcount_t *r)
{
return __refcount_sub_and_test(i, r, NULL);
}
static inline __must_check bool __refcount_dec_and_test(refcount_t *r, int *oldp)
{
return __refcount_sub_and_test(1, r, oldp);
}
/**
* refcount_dec_and_test - decrement a refcount and test if it is 0
* @r: the refcount
@ -323,16 +328,22 @@ static inline __must_check bool refcount_sub_and_test(int i, refcount_t *r)
*
* Return: true if the resulting refcount is 0, false otherwise
*/
static inline __must_check bool __refcount_dec_and_test(refcount_t *r, int *oldp)
{
return __refcount_sub_and_test(1, r, oldp);
}
static inline __must_check bool refcount_dec_and_test(refcount_t *r)
{
return __refcount_dec_and_test(r, NULL);
}
static inline void __refcount_dec(refcount_t *r, int *oldp)
{
int old = atomic_fetch_sub_release(1, &r->refs);
if (oldp)
*oldp = old;
if (unlikely(old <= 1))
refcount_warn_saturate(r, REFCOUNT_DEC_LEAK);
}
/**
* refcount_dec - decrement a refcount
* @r: the refcount
@ -343,17 +354,6 @@ static inline __must_check bool refcount_dec_and_test(refcount_t *r)
* Provides release memory ordering, such that prior loads and stores are done
* before.
*/
static inline void __refcount_dec(refcount_t *r, int *oldp)
{
int old = atomic_fetch_sub_release(1, &r->refs);
if (oldp)
*oldp = old;
if (unlikely(old <= 1))
refcount_warn_saturate(r, REFCOUNT_DEC_LEAK);
}
static inline void refcount_dec(refcount_t *r)
{
__refcount_dec(r, NULL);