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crypto: Enable context analysis

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Enable context analysis for crypto subsystem.

This demonstrates a larger conversion to use Clang's context
analysis. The benefit is additional static checking of locking rules,
along with better documentation.

Note the use of the __acquire_ret macro how to define an API where a
function returns a pointer to an object (struct scomp_scratch) with a
lock held. Additionally, the analysis only resolves aliases where the
analysis unambiguously sees that a variable was not reassigned after
initialization, requiring minor code changes.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-36-elver@google.com
This commit is contained in:
Marco Elver
2025-12-19 16:40:24 +01:00
committed by Peter Zijlstra
parent 87335b61a2
commit dc36d55d4e
11 changed files with 35 additions and 21 deletions
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2
crypto/algapi.c
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@@ -244,6 +244,7 @@ EXPORT_SYMBOL_GPL(crypto_remove_spawns);
static void crypto_alg_finish_registration(struct crypto_alg *alg,
struct list_head *algs_to_put)
__must_hold(&crypto_alg_sem)
{
struct crypto_alg *q;
@@ -299,6 +300,7 @@ static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
static struct crypto_larval *
__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
__must_hold(&crypto_alg_sem)
{
struct crypto_alg *q;
struct crypto_larval *larval;