[Linux-kernel-mentees] [PATCH 0/2] xarrary: Fix warnings reported by checkpatch

[Linux-kernel-mentees] [PATCH 0/2] xarrary: Fix warnings reported by checkpatch

[Vitor Massaru Iha]

Hi,

This patch series fixes checkpatch warnings in xarray.h:

 * Add identifier names for function definition arguments;
 * Add missing blank line after declaration;

Vitor Massaru Iha (2):
  xarray: Add identifier names for function definition arguments
  xarray: Add missing blank line after declaration

 include/linux/xarray.h | 88 +++++++++++++++++++++---------------------
 1 file changed, 45 insertions(+), 43 deletions(-)

-- 
2.21.1

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[Linux-kernel-mentees] [PATCH 1/2] xarray: Add identifier names for function definition arguments

[Vitor Massaru Iha]

Fix several checkpatch warnings such as:

WARNING: function definition argument 'struct xarray *' should also have an identifier name
+void *xa_load(struct xarray *, unsigned long index);

Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
---
 include/linux/xarray.h | 87 +++++++++++++++++++++---------------------
 1 file changed, 44 insertions(+), 43 deletions(-)

diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index f73e1775ded0..a7dec1ec0967 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h
@@ -344,21 +344,21 @@ struct xarray {
  */
 #define DEFINE_XARRAY_ALLOC1(name) DEFINE_XARRAY_FLAGS(name, XA_FLAGS_ALLOC1)
 
-void *xa_load(struct xarray *, unsigned long index);
-void *xa_store(struct xarray *, unsigned long index, void *entry, gfp_t);
-void *xa_erase(struct xarray *, unsigned long index);
-void *xa_store_range(struct xarray *, unsigned long first, unsigned long last,
-			void *entry, gfp_t);
-bool xa_get_mark(struct xarray *, unsigned long index, xa_mark_t);
-void xa_set_mark(struct xarray *, unsigned long index, xa_mark_t);
-void xa_clear_mark(struct xarray *, unsigned long index, xa_mark_t);
-void *xa_find(struct xarray *xa, unsigned long *index,
-		unsigned long max, xa_mark_t) __attribute__((nonnull(2)));
-void *xa_find_after(struct xarray *xa, unsigned long *index,
-		unsigned long max, xa_mark_t) __attribute__((nonnull(2)));
-unsigned int xa_extract(struct xarray *, void **dst, unsigned long start,
-		unsigned long max, unsigned int n, xa_mark_t);
-void xa_destroy(struct xarray *);
+void *xa_load(struct xarray *xa, unsigned long index);
+void *xa_store(struct xarray *xa, unsigned long index, void *entry, gfp_t gfp);
+void *xa_erase(struct xarray *xa, unsigned long index);
+void *xa_store_range(struct xarray *xa, unsigned long first, unsigned long last,
+			void *entry, gfp_t gfp);
+bool xa_get_mark(struct xarray *xa, unsigned long index, xa_mark_t mark);
+void xa_set_mark(struct xarray *xa, unsigned long index, xa_mark_t mark);
+void xa_clear_mark(struct xarray *xa, unsigned long index, xa_mark_t mark);
+void *xa_find(struct xarray *xa, unsigned long *index, unsigned long max,
+		 xa_mark_t filter) __attribute__((nonnull(2)));
+void *xa_find_after(struct xarray *xa, unsigned long *index, unsigned long max,
+			xa_mark_t filter) __attribute__((nonnull(2)));
+unsigned int xa_extract(struct xarray *xa, void **dst, unsigned long start,
+		unsigned long max, unsigned int n, xa_mark_t filter);
+void xa_destroy(struct xarray *xa);
 
 /**
  * xa_init_flags() - Initialise an empty XArray with flags.
@@ -551,18 +551,19 @@ static inline bool xa_marked(const struct xarray *xa, xa_mark_t mark)
  * may also re-enable interrupts if the XArray flags indicate the
  * locking should be interrupt safe.
  */
-void *__xa_erase(struct xarray *, unsigned long index);
-void *__xa_store(struct xarray *, unsigned long index, void *entry, gfp_t);
-void *__xa_cmpxchg(struct xarray *, unsigned long index, void *old,
-		void *entry, gfp_t);
-int __must_check __xa_insert(struct xarray *, unsigned long index,
-		void *entry, gfp_t);
-int __must_check __xa_alloc(struct xarray *, u32 *id, void *entry,
-		struct xa_limit, gfp_t);
-int __must_check __xa_alloc_cyclic(struct xarray *, u32 *id, void *entry,
-		struct xa_limit, u32 *next, gfp_t);
-void __xa_set_mark(struct xarray *, unsigned long index, xa_mark_t);
-void __xa_clear_mark(struct xarray *, unsigned long index, xa_mark_t);
+void *__xa_erase(struct xarray *xa, unsigned long index);
+void *__xa_store(struct xarray *xa, unsigned long index,
+		void *entry, gfp_t gfp);
+void *__xa_cmpxchg(struct xarray *xa, unsigned long index, void *old,
+		void *entry, gfp_t gfp);
+int __must_check __xa_insert(struct xarray *xa, unsigned long index,
+		void *entry, gfp_t gfp);
+int __must_check __xa_alloc(struct xarray *xa, u32 *id, void *entry,
+		struct xa_limit limit, gfp_t gfp);
+int __must_check __xa_alloc_cyclic(struct xarray *xa, u32 *id, void *entry,
+		struct xa_limit limit, u32 *next, gfp_t gfp);
+void __xa_set_mark(struct xarray *xa, unsigned long index, xa_mark_t mark);
+void __xa_clear_mark(struct xarray *xa, unsigned long index, xa_mark_t mark);
 
 /**
  * xa_store_bh() - Store this entry in the XArray.
@@ -1137,8 +1138,8 @@ struct xa_node {
 	};
 };
 
-void xa_dump(const struct xarray *);
-void xa_dump_node(const struct xa_node *);
+void xa_dump(const struct xarray *xa);
+void xa_dump_node(const struct xa_node *node);
 
 #ifdef XA_DEBUG
 #define XA_BUG_ON(xa, x) do {					\
@@ -1489,21 +1490,21 @@ static inline bool xas_retry(struct xa_state *xas, const void *entry)
 	return true;
 }
 
-void *xas_load(struct xa_state *);
-void *xas_store(struct xa_state *, void *entry);
-void *xas_find(struct xa_state *, unsigned long max);
-void *xas_find_conflict(struct xa_state *);
+void *xas_load(struct xa_state *xas);
+void *xas_store(struct xa_state *xas, void *entry);
+void *xas_find(struct xa_state *xas, unsigned long max);
+void *xas_find_conflict(struct xa_state *xas);
 
-bool xas_get_mark(const struct xa_state *, xa_mark_t);
-void xas_set_mark(const struct xa_state *, xa_mark_t);
-void xas_clear_mark(const struct xa_state *, xa_mark_t);
-void *xas_find_marked(struct xa_state *, unsigned long max, xa_mark_t);
-void xas_init_marks(const struct xa_state *);
+bool xas_get_mark(const struct xa_state *xas, xa_mark_t mark);
+void xas_set_mark(const struct xa_state *xas, xa_mark_t mark);
+void xas_clear_mark(const struct xa_state *xas, xa_mark_t mark);
+void *xas_find_marked(struct xa_state *xas, unsigned long max, xa_mark_t mark);
+void xas_init_marks(const struct xa_state *xas);
 
-bool xas_nomem(struct xa_state *, gfp_t);
-void xas_pause(struct xa_state *);
+bool xas_nomem(struct xa_state *xas, gfp_t gfp);
+void xas_pause(struct xa_state *xas);
 
-void xas_create_range(struct xa_state *);
+void xas_create_range(struct xa_state *xas);
 
 /**
  * xas_reload() - Refetch an entry from the xarray.
@@ -1721,8 +1722,8 @@ enum {
 #define xas_for_each_conflict(xas, entry) \
 	while ((entry = xas_find_conflict(xas)))
 
-void *__xas_next(struct xa_state *);
-void *__xas_prev(struct xa_state *);
+void *__xas_next(struct xa_state *xas);
+void *__xas_prev(struct xa_state *xas);
 
 /**
  * xas_prev() - Move iterator to previous index.
-- 
2.21.1

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Re: [Linux-kernel-mentees] [PATCH 1/2] xarray: Add identifier names for function definition arguments

[Matthew Wilcox]

On Tue, Mar 17, 2020 at 10:43:02PM -0300, Vitor Massaru Iha wrote:
> Fix several checkpatch warnings such as:
> 
> WARNING: function definition argument 'struct xarray *' should also have an identifier name
> +void *xa_load(struct xarray *, unsigned long index);

Checkpatch is wrong.
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Re: [Linux-kernel-mentees] [PATCH 1/2] xarray: Add identifier names for function definition arguments

[Vitor Massaru Iha]

Hi Matthew,

On Tue, 2020-03-17 at 18:55 -0700, Matthew Wilcox wrote:
> On Tue, Mar 17, 2020 at 10:43:02PM -0300, Vitor Massaru Iha wrote:
> > Fix several checkpatch warnings such as:
> > 
> > WARNING: function definition argument 'struct xarray *' should also
> > have an identifier name
> > +void *xa_load(struct xarray *, unsigned long index);
> 
> Checkpatch is wrong.

Sorry about that. I just tried to follow the kernel coding style.

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[Linux-kernel-mentees] [PATCH 2/2] xarray: Add missing blank line after declaration

[Vitor Massaru Iha]

Fix checkpatch warning: "WARNING: Missing a blank line after declarations"
in include/linux/xarray.h:1504

Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
---
 include/linux/xarray.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index a7dec1ec0967..61f83aca2326 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h
@@ -1624,6 +1624,7 @@ static inline unsigned int xas_find_chunk(struct xa_state *xas, bool advance,
 	if (XA_CHUNK_SIZE == BITS_PER_LONG) {
 		if (offset < XA_CHUNK_SIZE) {
 			unsigned long data = *addr & (~0UL << offset);
+
 			if (data)
 				return __ffs(data);
 		}
-- 
2.21.1

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Re: [Linux-kernel-mentees] [PATCH 2/2] xarray: Add missing blank line after declaration

[Matthew Wilcox]

On Tue, Mar 17, 2020 at 10:43:03PM -0300, Vitor Massaru Iha wrote:
> @@ -1624,6 +1624,7 @@ static inline unsigned int xas_find_chunk(struct xa_state *xas, bool advance,
>  	if (XA_CHUNK_SIZE == BITS_PER_LONG) {
>  		if (offset < XA_CHUNK_SIZE) {
>  			unsigned long data = *addr & (~0UL << offset);
> +
>  			if (data)
>  				return __ffs(data);
>  		}

Do you seriously think this makes the function in any way more legible?
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Re: [Linux-kernel-mentees] [PATCH 2/2] xarray: Add missing blank line after declaration

[Vitor Massaru Iha]

Hi Matthew,

On Tue, 2020-03-17 at 18:55 -0700, Matthew Wilcox wrote:
> On Tue, Mar 17, 2020 at 10:43:03PM -0300, Vitor Massaru Iha wrote:
> > @@ -1624,6 +1624,7 @@ static inline unsigned int
> > xas_find_chunk(struct xa_state *xas, bool advance,
> >  	if (XA_CHUNK_SIZE == BITS_PER_LONG) {
> >  		if (offset < XA_CHUNK_SIZE) {
> >  			unsigned long data = *addr & (~0UL << offset);
> > +
> >  			if (data)
> >  				return __ffs(data);
> >  		}
> 
> Do you seriously think this makes the function in any way more
> legible?

Sorry. I was in doubt whether it would actually improve. I did some
research in older patches and I found something like this.



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