diff options
| -rw-r--r-- | arch/arm64/kvm/nested.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/papr-vpd.c | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_exec.c | 3 | ||||
| -rw-r--r-- | fs/xfs/xfs_log_recover.c | 2 | ||||
| -rw-r--r-- | include/linux/slab.h | 4 | ||||
| -rw-r--r-- | kernel/resource.c | 3 | ||||
| -rw-r--r-- | lib/fortify_kunit.c | 3 | ||||
| -rw-r--r-- | mm/util.c | 100 |
8 files changed, 77 insertions, 44 deletions
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index de789e0f1ae9..1ff3079aabc9 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -62,7 +62,6 @@ int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu) */ num_mmus = atomic_read(&kvm->online_vcpus) * S2_MMU_PER_VCPU; tmp = kvrealloc(kvm->arch.nested_mmus, - size_mul(sizeof(*kvm->arch.nested_mmus), kvm->arch.nested_mmus_size), size_mul(sizeof(*kvm->arch.nested_mmus), num_mmus), GFP_KERNEL_ACCOUNT | __GFP_ZERO); if (!tmp) diff --git a/arch/powerpc/platforms/pseries/papr-vpd.c b/arch/powerpc/platforms/pseries/papr-vpd.c index c29e85db5f35..1574176e3ffc 100644 --- a/arch/powerpc/platforms/pseries/papr-vpd.c +++ b/arch/powerpc/platforms/pseries/papr-vpd.c @@ -156,10 +156,7 @@ static int vpd_blob_extend(struct vpd_blob *blob, const char *data, size_t len) const char *old_ptr = blob->data; char *new_ptr; - new_ptr = old_ptr ? - kvrealloc(old_ptr, old_len, new_len, GFP_KERNEL_ACCOUNT) : - kvmalloc(len, GFP_KERNEL_ACCOUNT); - + new_ptr = kvrealloc(old_ptr, new_len, GFP_KERNEL_ACCOUNT); if (!new_ptr) return -ENOMEM; diff --git a/drivers/gpu/drm/drm_exec.c b/drivers/gpu/drm/drm_exec.c index 2da094bdf8a4..18e366cc4993 100644 --- a/drivers/gpu/drm/drm_exec.c +++ b/drivers/gpu/drm/drm_exec.c @@ -145,8 +145,7 @@ static int drm_exec_obj_locked(struct drm_exec *exec, size_t size = exec->max_objects * sizeof(void *); void *tmp; - tmp = kvrealloc(exec->objects, size, size + PAGE_SIZE, - GFP_KERNEL); + tmp = kvrealloc(exec->objects, size + PAGE_SIZE, GFP_KERNEL); if (!tmp) return -ENOMEM; diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 4423dd344239..1997981827fb 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -2128,7 +2128,7 @@ xlog_recover_add_to_cont_trans( old_ptr = item->ri_buf[item->ri_cnt-1].i_addr; old_len = item->ri_buf[item->ri_cnt-1].i_len; - ptr = kvrealloc(old_ptr, old_len, len + old_len, GFP_KERNEL); + ptr = kvrealloc(old_ptr, len + old_len, GFP_KERNEL); if (!ptr) return -ENOMEM; memcpy(&ptr[old_len], dp, len); diff --git a/include/linux/slab.h b/include/linux/slab.h index eb2bf4629157..c9cb42203183 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -841,8 +841,8 @@ kvmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, int node) #define kvcalloc_node(...) alloc_hooks(kvcalloc_node_noprof(__VA_ARGS__)) #define kvcalloc(...) alloc_hooks(kvcalloc_noprof(__VA_ARGS__)) -extern void *kvrealloc_noprof(const void *p, size_t oldsize, size_t newsize, gfp_t flags) - __realloc_size(3); +void *kvrealloc_noprof(const void *p, size_t size, gfp_t flags) + __realloc_size(2); #define kvrealloc(...) alloc_hooks(kvrealloc_noprof(__VA_ARGS__)) extern void kvfree(const void *addr); diff --git a/kernel/resource.c b/kernel/resource.c index 14777afb0a99..9f747bb7cd03 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -450,8 +450,7 @@ int walk_system_ram_res_rev(u64 start, u64 end, void *arg, /* re-alloc */ struct resource *rams_new; - rams_new = kvrealloc(rams, rams_size * sizeof(struct resource), - (rams_size + 16) * sizeof(struct resource), + rams_new = kvrealloc(rams, (rams_size + 16) * sizeof(struct resource), GFP_KERNEL); if (!rams_new) goto out; diff --git a/lib/fortify_kunit.c b/lib/fortify_kunit.c index f9ad60a9c7bd..ecb638d4cde1 100644 --- a/lib/fortify_kunit.c +++ b/lib/fortify_kunit.c @@ -306,8 +306,7 @@ DEFINE_ALLOC_SIZE_TEST_PAIR(vmalloc) orig = kvmalloc(prev_size, gfp); \ KUNIT_EXPECT_TRUE(test, orig != NULL); \ checker(((expected_pages) * PAGE_SIZE) * 2, \ - kvrealloc(orig, prev_size, \ - ((alloc_pages) * PAGE_SIZE) * 2, gfp), \ + kvrealloc(orig, ((alloc_pages) * PAGE_SIZE) * 2, gfp), \ kvfree(p)); \ } while (0) DEFINE_ALLOC_SIZE_TEST_PAIR(kvmalloc) diff --git a/mm/util.c b/mm/util.c index bd283e2132e0..ac01925a4179 100644 --- a/mm/util.c +++ b/mm/util.c @@ -608,6 +608,28 @@ unsigned long vm_mmap(struct file *file, unsigned long addr, } EXPORT_SYMBOL(vm_mmap); +static gfp_t kmalloc_gfp_adjust(gfp_t flags, size_t size) +{ + /* + * We want to attempt a large physically contiguous block first because + * it is less likely to fragment multiple larger blocks and therefore + * contribute to a long term fragmentation less than vmalloc fallback. + * However make sure that larger requests are not too disruptive - no + * OOM killer and no allocation failure warnings as we have a fallback. + */ + if (size > PAGE_SIZE) { + flags |= __GFP_NOWARN; + + if (!(flags & __GFP_RETRY_MAYFAIL)) + flags |= __GFP_NORETRY; + + /* nofail semantic is implemented by the vmalloc fallback */ + flags &= ~__GFP_NOFAIL; + } + + return flags; +} + /** * __kvmalloc_node - attempt to allocate physically contiguous memory, but upon * failure, fall back to non-contiguous (vmalloc) allocation. @@ -627,32 +649,15 @@ EXPORT_SYMBOL(vm_mmap); */ void *__kvmalloc_node_noprof(DECL_BUCKET_PARAMS(size, b), gfp_t flags, int node) { - gfp_t kmalloc_flags = flags; void *ret; /* - * We want to attempt a large physically contiguous block first because - * it is less likely to fragment multiple larger blocks and therefore - * contribute to a long term fragmentation less than vmalloc fallback. - * However make sure that larger requests are not too disruptive - no - * OOM killer and no allocation failure warnings as we have a fallback. - */ - if (size > PAGE_SIZE) { - kmalloc_flags |= __GFP_NOWARN; - - if (!(kmalloc_flags & __GFP_RETRY_MAYFAIL)) - kmalloc_flags |= __GFP_NORETRY; - - /* nofail semantic is implemented by the vmalloc fallback */ - kmalloc_flags &= ~__GFP_NOFAIL; - } - - ret = __kmalloc_node_noprof(PASS_BUCKET_PARAMS(size, b), kmalloc_flags, node); - - /* * It doesn't really make sense to fallback to vmalloc for sub page * requests */ + ret = __kmalloc_node_noprof(PASS_BUCKET_PARAMS(size, b), + kmalloc_gfp_adjust(flags, size), + node); if (ret || size <= PAGE_SIZE) return ret; @@ -715,18 +720,53 @@ void kvfree_sensitive(const void *addr, size_t len) } EXPORT_SYMBOL(kvfree_sensitive); -void *kvrealloc_noprof(const void *p, size_t oldsize, size_t newsize, gfp_t flags) +/** + * kvrealloc - reallocate memory; contents remain unchanged + * @p: object to reallocate memory for + * @size: the size to reallocate + * @flags: the flags for the page level allocator + * + * If @p is %NULL, kvrealloc() behaves exactly like kvmalloc(). If @size is 0 + * and @p is not a %NULL pointer, the object pointed to is freed. + * + * If __GFP_ZERO logic is requested, callers must ensure that, starting with the + * initial memory allocation, every subsequent call to this API for the same + * memory allocation is flagged with __GFP_ZERO. Otherwise, it is possible that + * __GFP_ZERO is not fully honored by this API. + * + * In any case, the contents of the object pointed to are preserved up to the + * lesser of the new and old sizes. + * + * This function must not be called concurrently with itself or kvfree() for the + * same memory allocation. + * + * Return: pointer to the allocated memory or %NULL in case of error + */ +void *kvrealloc_noprof(const void *p, size_t size, gfp_t flags) { - void *newp; + void *n; - if (oldsize >= newsize) - return (void *)p; - newp = kvmalloc_noprof(newsize, flags); - if (!newp) - return NULL; - memcpy(newp, p, oldsize); - kvfree(p); - return newp; + if (is_vmalloc_addr(p)) + return vrealloc_noprof(p, size, flags); + + n = krealloc_noprof(p, size, kmalloc_gfp_adjust(flags, size)); + if (!n) { + /* We failed to krealloc(), fall back to kvmalloc(). */ + n = kvmalloc_noprof(size, flags); + if (!n) + return NULL; + + if (p) { + /* We already know that `p` is not a vmalloc address. */ + kasan_disable_current(); + memcpy(n, kasan_reset_tag(p), ksize(p)); + kasan_enable_current(); + + kfree(p); + } + } + + return n; } EXPORT_SYMBOL(kvrealloc_noprof); |