[PATCH v2 RESEND] crypto: lib/mpi - Extend support for scope-based resource management

[Markus Elfring <Markus.Elfring@web.de>]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 18 Sep 2024 11:06:35 +0200

Scope-based resource management became supported for some
programming interfaces by contributions of Peter Zijlstra on 2023-05-26.
See also the commit 54da6a0924311c7cf5015533991e44fb8eb12773 ("locking:
Introduce __cleanup() based infrastructure").

Thus add a macro call so that the attribute “__free(mpi_free)” can be
applied accordingly.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---

V2:
The kernel build service pointed out that the proposed identifier “T_”
was not recognised by the compiler.
Thus reserved identifiers need still be applied also at such a place instead
so far.
I became curious under which circumstances corresponding development concerns
will be reconsidered any more.


 include/linux/mpi.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/mpi.h b/include/linux/mpi.h
index 47be46f36435..6fbcb88ce296 100644
--- a/include/linux/mpi.h
+++ b/include/linux/mpi.h
@@ -19,6 +19,8 @@

 #include <linux/types.h>
 #include <linux/scatterlist.h>
+#include <linux/cleanup.h>
+#include <linux/err.h>

 #define BYTES_PER_MPI_LIMB	(BITS_PER_LONG / 8)
 #define BITS_PER_MPI_LIMB	BITS_PER_LONG
@@ -44,6 +46,8 @@ typedef struct gcry_mpi *MPI;
 /*-- mpiutil.c --*/
 MPI mpi_alloc(unsigned nlimbs);
 void mpi_free(MPI a);
+DEFINE_FREE(mpi_free, MPI, if (!IS_ERR_OR_NULL(_T)) mpi_free(_T))
+
 int mpi_resize(MPI a, unsigned nlimbs);

 MPI mpi_copy(MPI a);
--
2.46.0