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authorGeert Uytterhoeven <geert+renesas@glider.be>2023-07-05 16:54:04 +0200
committerAndrew Morton <akpm@linux-foundation.org>2023-07-08 09:29:32 -0700
commit8ba388c06bc8056935ec1814b2689bfb42f3b89a (patch)
treec63f71f7e9d6220924bef8e4efebc00ebc5efd98 /lib/dhry_1.c
parentfdb54d96600aafe45951f549866cd6fc1af59954 (diff)
lib: dhry: fix sleeping allocations inside non-preemptable section
The Smatch static checker reports the following warnings: lib/dhry_run.c:38 dhry_benchmark() warn: sleeping in atomic context lib/dhry_run.c:43 dhry_benchmark() warn: sleeping in atomic context Indeed, dhry() does sleeping allocations inside the non-preemptable section delimited by get_cpu()/put_cpu(). Fix this by using atomic allocations instead. Add error handling, as atomic these allocations may fail. Link: https://lkml.kernel.org/r/bac6d517818a7cd8efe217c1ad649fffab9cc371.1688568764.git.geert+renesas@glider.be Fixes: 13684e966d46283e ("lib: dhry: fix unstable smp_processor_id(_) usage") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/r/0469eb3a-02eb-4b41-b189-de20b931fa56@moroto.mountain Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib/dhry_1.c')
-rw-r--r--lib/dhry_1.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/lib/dhry_1.c b/lib/dhry_1.c
index 83247106824c..08edbbb19f57 100644
--- a/lib/dhry_1.c
+++ b/lib/dhry_1.c
@@ -139,8 +139,15 @@ int dhry(int n)
/* Initializations */
- Next_Ptr_Glob = (Rec_Pointer)kzalloc(sizeof(Rec_Type), GFP_KERNEL);
- Ptr_Glob = (Rec_Pointer)kzalloc(sizeof(Rec_Type), GFP_KERNEL);
+ Next_Ptr_Glob = (Rec_Pointer)kzalloc(sizeof(Rec_Type), GFP_ATOMIC);
+ if (!Next_Ptr_Glob)
+ return -ENOMEM;
+
+ Ptr_Glob = (Rec_Pointer)kzalloc(sizeof(Rec_Type), GFP_ATOMIC);
+ if (!Ptr_Glob) {
+ kfree(Next_Ptr_Glob);
+ return -ENOMEM;
+ }
Ptr_Glob->Ptr_Comp = Next_Ptr_Glob;
Ptr_Glob->Discr = Ident_1;