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Jakub Kicinski 02417205fd Merge branch 'replace-call_rcu-by-kfree_rcu-for-simple-kmem_cache_free-callback' 
Julia Lawall says:

====================
replace call_rcu by kfree_rcu for simple kmem_cache_free callback

Since SLOB was removed and since
commit 6c6c47b063 ("mm, slab: call kvfree_rcu_barrier() from kmem_cache_destroy()"),
it is not necessary to use call_rcu when the callback only performs
kmem_cache_free. Use kfree_rcu() directly.

The changes were done using the following Coccinelle semantic patch.
This semantic patch is designed to ignore cases where the callback
function is used in another way.

// <smpl>

@r@
expression e;
local idexpression e2;
identifier cb,f,g;
position p;
@@

(
call_rcu(...,e2)
|
call_rcu(&e->f,cb@p)
|
call_rcu(&e->f.g,cb@p)
)

@r1@
type T,T1;
identifier x,r.cb;
@@

 cb(...) {
(
   kmem_cache_free(...);
|
   T x = ...;
   kmem_cache_free(...,(T1)x);
|
   T x;
   x = ...;
   kmem_cache_free(...,(T1)x);
)
 }

@s depends on r1@
position p != r.p;
identifier r.cb;
@@

 cb@p

@script:ocaml@
cb << r.cb;
p << s.p;
@@

Printf.eprintf "Other use of %s at %s:%d\n" cb (List.hd p).file (List.hd p).line

@depends on r1 && !s@
expression e;
identifier r.cb,f,g;
position r.p;
@@

(
- call_rcu(&e->f,cb@p)
+ kfree_rcu(e,f)
|
- call_rcu(&e->f.g,cb@p)
+ kfree_rcu(e,f.g)
)

@r1a depends on !s@
type T,T1;
identifier x,r.cb;
@@

- cb(...) {
(
-  kmem_cache_free(...);
|
-  T x = ...;
-  kmem_cache_free(...,(T1)x);
|
-  T x;
-  x = ...;
-  kmem_cache_free(...,(T1)x);
)
- }

@r2 depends on !r1@
identifier r.cb;
@@

cb(...) {
 ...
}

@script:ocaml depends on !r1 && !r2@
cb << r.cb;
@@

Printf.eprintf "need definition for %s\n" cb
// </smpl>
====================

Acked-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Link: https://patch.msgid.link/20241013201704.49576-1-Julia.Lawall@inria.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2024-10-15 10:50:22 -07:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.