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mm: add basic tests for lazy_mmu

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Add basic KUnit tests for the generic aspects of the lazy MMU mode: ensure
that it appears active when it should, depending on how enable/disable and
pause/resume pairs are nested.

[akpm@linux-foundation.org: export ppc64_tlb_batch and __flush_tlb_pending to modules]
[ritesh.list@gmail.com: use EXPORT_SYMBOL_IF_KUNIT()]
  Link: https://lkml.kernel.org/r/87a4zhkt6h.ritesh.list@gmail.com
[kevin.brodsky@arm.com: move MODULE_IMPORT_NS(), add comment]
  Link: https://lkml.kernel.org/r/20251217163812.2633648-2-kevin.brodsky@arm.com
Link: https://lkml.kernel.org/r/20251215150323.2218608-15-kevin.brodsky@arm.com
Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David S. Miller <davem@davemloft.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Juegren Gross <jgross@suse.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kevin Brodsky
2025-12-15 15:03:23 +00:00
committed by Andrew Morton
parent 291b3abed6
commit ee628d9cc8
4 changed files with 90 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

74
mm/tests/lazy_mmu_mode_kunit.c Normal file
View File

@@ -0,0 +1,74 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <kunit/test.h>
#include <linux/pgtable.h>
/* For some symbols referenced by arch_{enter,leave}_lazy_mmu_mode on powerpc */
MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING");
static void expect_not_active(struct kunit *test)
{
KUNIT_EXPECT_FALSE(test, is_lazy_mmu_mode_active());
}
static void expect_active(struct kunit *test)
{
KUNIT_EXPECT_TRUE(test, is_lazy_mmu_mode_active());
}
static void lazy_mmu_mode_active(struct kunit *test)
{
expect_not_active(test);
lazy_mmu_mode_enable();
expect_active(test);
{
/* Nested section */
lazy_mmu_mode_enable();
expect_active(test);
lazy_mmu_mode_disable();
expect_active(test);
}
{
/* Paused section */
lazy_mmu_mode_pause();
expect_not_active(test);
{
/* No effect (paused) */
lazy_mmu_mode_enable();
expect_not_active(test);
lazy_mmu_mode_disable();
expect_not_active(test);
lazy_mmu_mode_pause();
expect_not_active(test);
lazy_mmu_mode_resume();
expect_not_active(test);
}
lazy_mmu_mode_resume();
expect_active(test);
}
lazy_mmu_mode_disable();
expect_not_active(test);
}
static struct kunit_case lazy_mmu_mode_test_cases[] = {
KUNIT_CASE(lazy_mmu_mode_active),
{}
};
static struct kunit_suite lazy_mmu_mode_test_suite = {
.name = "lazy_mmu_mode",
.test_cases = lazy_mmu_mode_test_cases,
};
kunit_test_suite(lazy_mmu_mode_test_suite);
MODULE_DESCRIPTION("Tests for the lazy MMU mode");
MODULE_LICENSE("GPL");