The patch titled
Subject: alloc_tag: avoid execmem_vmap() when !MMU
has been added to the -mm mm-unstable branch. Its filename is
alloc_tag-populate-memory-for-module-tags-as-needed-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/alloc_tag-populate-memory-for-module-tags-as-needed-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: alloc_tag: avoid execmem_vmap() when !MMU
Date: Thu, 31 Oct 2024 16:36:11 -0700
With CONFIG_MMU=n __get_vm_area_node() is not available. Add CONFIG_MMU
dependency for memory allocation tagging since it uses __get_vm_area_node()
via execmem_vmap().
Link: https://lkml.kernel.org/r/20241031233611.3833002-1-surenb@xxxxxxxxxx
Fixes: 57bc3834fb6f ("alloc_tag: populate memory for module tags as needed")
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202410250808.dQGyYjlk-lkp@xxxxxxxxx/
Closes: https://lore.kernel.org/oe-lkp/202410251525.9f85854d-oliver.sang@xxxxxxxxx
Closes: https://lore.kernel.org/oe-kbuild-all/202410261016.IO7C6Cml-lkp@xxxxxxxxx/
Closes: https://lore.kernel.org/oe-kbuild-all/202410270919.LebQlmxD-lkp@xxxxxxxxx/
Suggested-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Daniel Gomez <da.gomez@xxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dennis Zhou <dennis@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Petr Pavlu <petr.pavlu@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Cc: Sourav Panda <souravpanda@xxxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Thomas Huth <thuth@xxxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Xiongwei Song <xiongwei.song@xxxxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/execmem.h | 2 ++
lib/Kconfig.debug | 1 +
mm/execmem.c | 32 ++++++++++++++++----------------
3 files changed, 19 insertions(+), 16 deletions(-)
--- a/include/linux/execmem.h~alloc_tag-populate-memory-for-module-tags-as-needed-fix
+++ a/include/linux/execmem.h
@@ -139,6 +139,7 @@ void *execmem_alloc(enum execmem_type ty
*/
void execmem_free(void *ptr);
+#ifdef CONFIG_MMU
/**
* execmem_vmap - create virtual mapping for EXECMEM_MODULE_DATA memory
* @size: size of the virtual mapping in bytes
@@ -148,6 +149,7 @@ void execmem_free(void *ptr);
* Return: the area descriptor on success or %NULL on failure.
*/
struct vm_struct *execmem_vmap(size_t size);
+#endif
/**
* execmem_update_copy - copy an update to executable memory
--- a/lib/Kconfig.debug~alloc_tag-populate-memory-for-module-tags-as-needed-fix
+++ a/lib/Kconfig.debug
@@ -993,6 +993,7 @@ config CODE_TAGGING
config MEM_ALLOC_PROFILING
bool "Enable memory allocation profiling"
default n
+ depends on MMU
depends on PROC_FS
depends on !DEBUG_FORCE_WEAK_PER_CPU
select CODE_TAGGING
--- a/mm/execmem.c~alloc_tag-populate-memory-for-module-tags-as-needed-fix
+++ a/mm/execmem.c
@@ -64,6 +64,22 @@ static void *execmem_vmalloc(struct exec
return p;
}
+
+struct vm_struct *execmem_vmap(size_t size)
+{
+ struct execmem_range *range = &execmem_info->ranges[EXECMEM_MODULE_DATA];
+ struct vm_struct *area;
+
+ area = __get_vm_area_node(size, range->alignment, PAGE_SHIFT, VM_ALLOC,
+ range->start, range->end, NUMA_NO_NODE,
+ GFP_KERNEL, __builtin_return_address(0));
+ if (!area && range->fallback_start)
+ area = __get_vm_area_node(size, range->alignment, PAGE_SHIFT, VM_ALLOC,
+ range->fallback_start, range->fallback_end,
+ NUMA_NO_NODE, GFP_KERNEL, __builtin_return_address(0));
+
+ return area;
+}
#else
static void *execmem_vmalloc(struct execmem_range *range, size_t size,
pgprot_t pgprot, unsigned long vm_flags)
@@ -368,22 +384,6 @@ void execmem_free(void *ptr)
vfree(ptr);
}
-struct vm_struct *execmem_vmap(size_t size)
-{
- struct execmem_range *range = &execmem_info->ranges[EXECMEM_MODULE_DATA];
- struct vm_struct *area;
-
- area = __get_vm_area_node(size, range->alignment, PAGE_SHIFT, VM_ALLOC,
- range->start, range->end, NUMA_NO_NODE,
- GFP_KERNEL, __builtin_return_address(0));
- if (!area && range->fallback_start)
- area = __get_vm_area_node(size, range->alignment, PAGE_SHIFT, VM_ALLOC,
- range->fallback_start, range->fallback_end,
- NUMA_NO_NODE, GFP_KERNEL, __builtin_return_address(0));
-
- return area;
-}
-
void *execmem_update_copy(void *dst, const void *src, size_t size)
{
return text_poke_copy(dst, src, size);
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
maple_tree-add-mas_for_each_rev-helper.patch
alloc_tag-introduce-shutdown_mem_profiling-helper-function.patch
alloc_tag-load-module-tags-into-separate-contiguous-memory.patch
alloc_tag-populate-memory-for-module-tags-as-needed.patch
alloc_tag-populate-memory-for-module-tags-as-needed-fix.patch
alloc_tag-introduce-pgtag_ref_handle-to-abstract-page-tag-references.patch
alloc_tag-support-for-page-allocation-tag-compression.patch
mm-convert-mm_lock_seq-to-a-proper-seqcount.patch
mm-introduce-mmap_lock_speculation_beginend.patch
mm-codetag-uninline-and-move-pgalloc_tag_copy-and-pgalloc_tag_split.patch
