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2023-11-22 d0a428a6556ea5a006e22e28b0b1cd037885fe20

 kernel/fs/squashfs/decompressor_multi_percpu.c
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@@ -10,6 +10,7 @@
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 #include <linux/slab.h>
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 #include <linux/percpu.h>
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 #include <linux/buffer_head.h>
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+#include <linux/locallock.h>
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 #include "squashfs_fs.h"
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 #include "squashfs_fs_sb.h"
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@@ -24,6 +25,8 @@
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 struct squashfs_stream {
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 	void		*stream;
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 };
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+
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+static DEFINE_LOCAL_IRQ_LOCK(stream_lock);
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 void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
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 						void *comp_opts)
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@@ -79,10 +82,15 @@
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 {
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 	struct squashfs_stream __percpu *percpu =
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 			(struct squashfs_stream __percpu *) msblk->stream;
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-	struct squashfs_stream *stream = get_cpu_ptr(percpu);
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-	int res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
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-		offset, length, output);
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-	put_cpu_ptr(stream);
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+	struct squashfs_stream *stream;
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+	int res;
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+
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+	stream = get_locked_ptr(stream_lock, percpu);
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+
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+	res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
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+			offset, length, output);
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+
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+	put_locked_ptr(stream_lock, stream);
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 	if (res < 0)
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 		ERROR("%s decompression failed, data probably corrupt\n",