add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/drivers/block/zram/zcomp.c
..
..
@@ -116,12 +116,20 @@
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 struct zcomp_strm *zcomp_stream_get(struct zcomp *comp)
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 {
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-	return *get_cpu_ptr(comp->stream);
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+	struct zcomp_strm *zstrm;
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+
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+	zstrm = *get_local_ptr(comp->stream);
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+	spin_lock(&zstrm->zcomp_lock);
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+	return zstrm;
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 }
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 void zcomp_stream_put(struct zcomp *comp)
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 {
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-	put_cpu_ptr(comp->stream);
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+	struct zcomp_strm *zstrm;
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+
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+	zstrm = *this_cpu_ptr(comp->stream);
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+	spin_unlock(&zstrm->zcomp_lock);
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+	put_local_ptr(zstrm);
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 }
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 int zcomp_compress(struct zcomp_strm *zstrm,
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@@ -171,6 +179,7 @@
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 		pr_err("Can't allocate a compression stream\n");
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 		return -ENOMEM;
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 	}
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+	spin_lock_init(&zstrm->zcomp_lock);
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 	*per_cpu_ptr(comp->stream, cpu) = zstrm;
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 	return 0;
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 }