From: Mike Rapoport <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>,
Andy Lutomirski <luto@kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Borislav Petkov <bp@alien8.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Christoph Lameter <cl@linux.com>,
"David S. Miller" <davem@davemloft.net>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Hildenbrand <david@redhat.com>,
David Rientjes <rientjes@google.com>,
"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Heiko Carstens <hca@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Len Brown <len.brown@intel.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Mike Rapoport <rppt@kernel.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Mackerras <paulus@samba.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Pavel Machek <pavel@ucw.cz>, Pekka Enberg <penberg@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Thomas Gleixner <tglx@linutronix.de>,
Vasily Gorbik <gor@linux.ibm.com>,
Vlastimil Babka <vbabka@suse.cz>, Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
sparclinux@vger.kernel.org, x86@kernel.org
Subject: [PATCH v5 2/5] slab: debug: split slab_kernel_map() to map and unmap variants
Date: Sun, 8 Nov 2020 08:57:55 +0200 [thread overview]
Message-ID: <20201108065758.1815-3-rppt@kernel.org> (raw)
In-Reply-To: <20201108065758.1815-1-rppt@kernel.org>
From: Mike Rapoport <rppt@linux.ibm.com>
Instead of using slab_kernel_map() with 'map' parameter to remap pages when
DEBUG_PAGEALLOC is enabled, use dedicated helpers slab_kernel_map() and
slab_kernel_unmap().
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
mm/slab.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 07317386e150..0719421d69f7 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1428,17 +1428,21 @@ static bool is_debug_pagealloc_cache(struct kmem_cache *cachep)
return false;
}
-static void slab_kernel_map(struct kmem_cache *cachep, void *objp, int map)
+static void slab_kernel_map(struct kmem_cache *cachep, void *objp)
{
if (!is_debug_pagealloc_cache(cachep))
return;
- if (map)
- debug_pagealloc_map_pages(virt_to_page(objp),
- cachep->size / PAGE_SIZE);
- else
- debug_pagealloc_unmap_pages(virt_to_page(objp),
- cachep->size / PAGE_SIZE);
+ debug_pagealloc_map_pages(virt_to_page(objp), cachep->size / PAGE_SIZE);
+}
+
+static void slab_kernel_unmap(struct kmem_cache *cachep, void *objp)
+{
+ if (!is_debug_pagealloc_cache(cachep))
+ return;
+
+ debug_pagealloc_unmap_pages(virt_to_page(objp),
+ cachep->size / PAGE_SIZE);
}
static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val)
@@ -1585,7 +1589,7 @@ static void slab_destroy_debugcheck(struct kmem_cache *cachep,
if (cachep->flags & SLAB_POISON) {
check_poison_obj(cachep, objp);
- slab_kernel_map(cachep, objp, 1);
+ slab_kernel_map(cachep, objp);
}
if (cachep->flags & SLAB_RED_ZONE) {
if (*dbg_redzone1(cachep, objp) != RED_INACTIVE)
@@ -2360,7 +2364,7 @@ static void cache_init_objs_debug(struct kmem_cache *cachep, struct page *page)
/* need to poison the objs? */
if (cachep->flags & SLAB_POISON) {
poison_obj(cachep, objp, POISON_FREE);
- slab_kernel_map(cachep, objp, 0);
+ slab_kernel_unmap(cachep, objp);
}
}
#endif
@@ -2728,7 +2732,7 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
if (cachep->flags & SLAB_POISON) {
poison_obj(cachep, objp, POISON_FREE);
- slab_kernel_map(cachep, objp, 0);
+ slab_kernel_unmap(cachep, objp);
}
return objp;
}
@@ -2993,7 +2997,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
return objp;
if (cachep->flags & SLAB_POISON) {
check_poison_obj(cachep, objp);
- slab_kernel_map(cachep, objp, 1);
+ slab_kernel_map(cachep, objp);
poison_obj(cachep, objp, POISON_INUSE);
}
if (cachep->flags & SLAB_STORE_USER)
--
2.28.0
next prev parent reply other threads:[~2020-11-08 6:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-08 6:57 [PATCH v5 0/5] arch, mm: improve robustness of direct map manipulation Mike Rapoport
2020-11-08 6:57 ` [PATCH v5 1/5] mm: introduce debug_pagealloc_{map,unmap}_pages() helpers Mike Rapoport
2020-11-09 11:33 ` Vlastimil Babka
2020-11-09 14:41 ` Mike Rapoport
2020-11-08 6:57 ` Mike Rapoport [this message]
2020-11-08 6:57 ` [PATCH v5 3/5] PM: hibernate: make direct map manipulations more explicit Mike Rapoport
2020-11-08 6:57 ` [PATCH v5 4/5] arch, mm: restore dependency of __kernel_map_pages() on DEBUG_PAGEALLOC Mike Rapoport
2020-11-08 6:57 ` [PATCH v5 5/5] arch, mm: make kernel_page_present() always available Mike Rapoport
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