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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/uapi/linux/mmc/ioctl.h
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@@ -6,7 +6,10 @@
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 #include <linux/major.h>
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 struct mmc_ioc_cmd {
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-	/* Implies direction of data.  true = write, false = read */
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+	/*
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+	 * Direction of data: nonzero = write, zero = read.
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+	 * Bit 31 selects 'Reliable Write' for RPMB.
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+	 */
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 	int write_flag;
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 	/* Application-specific command.  true = precede with CMD55 */