linux-kernel - [PATCH] dma/idxd: Remove _

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Message-ID: <20250320081807.3688123-1-yi.sun@intel.com>
Date: Thu, 20 Mar 2025 16:18:07 +0800
From: Yi Sun <yi.sun@...el.com>
To: dave.jiang@...el.com,
	anil.s.keshavamurthy@...el.com,
	vkoul@...nel.org,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: gordon.jin@...el.com,
	andriy.shevchenko@...el.com,
	yi.sun@...ux.intel.com,
	Yi Sun <yi.sun@...el.com>
Subject: [PATCH] dma/idxd: Remove __packed from structures

The __packed attribute introduces potential unaligned memory accesses
and endianness portability issues. Instead of relying on compiler-specific
packing, it's much better to explicitly fill structure gaps using padding
fields, ensuring natural alignment.

Since all previously __packed structures already enforce proper alignment
through manual padding, the __packed qualifiers are unnecessary and can be
safely removed.

Signed-off-by: Yi Sun <yi.sun@...el.com>

diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h
index 006ba206ab1b..9c1c546fe443 100644
--- a/drivers/dma/idxd/registers.h
+++ b/drivers/dma/idxd/registers.h
@@ -45,7 +45,7 @@ union gen_cap_reg {
 		u64 rsvd3:32;
 	};
 	u64 bits;
-} __packed;
+};
 #define IDXD_GENCAP_OFFSET		0x10
 
 union wq_cap_reg {
@@ -65,7 +65,7 @@ union wq_cap_reg {
 		u64 rsvd4:8;
 	};
 	u64 bits;
-} __packed;
+};
 #define IDXD_WQCAP_OFFSET		0x20
 #define IDXD_WQCFG_MIN			5
 
@@ -79,7 +79,7 @@ union group_cap_reg {
 		u64 rsvd:45;
 	};
 	u64 bits;
-} __packed;
+};
 #define IDXD_GRPCAP_OFFSET		0x30
 
 union engine_cap_reg {
@@ -88,7 +88,7 @@ union engine_cap_reg {
 		u64 rsvd:56;
 	};
 	u64 bits;
-} __packed;
+};
 
 #define IDXD_ENGCAP_OFFSET		0x38
 
@@ -114,7 +114,7 @@ union offsets_reg {
 		u64 rsvd:48;
 	};
 	u64 bits[2];
-} __packed;
+};
 
 #define IDXD_TABLE_MULT			0x100
 
@@ -128,7 +128,7 @@ union gencfg_reg {
 		u32 rsvd2:18;
 	};
 	u32 bits;
-} __packed;
+};
 
 #define IDXD_GENCTRL_OFFSET		0x88
 union genctrl_reg {
@@ -139,7 +139,7 @@ union genctrl_reg {
 		u32 rsvd:29;
 	};
 	u32 bits;
-} __packed;
+};
 
 #define IDXD_GENSTATS_OFFSET		0x90
 union gensts_reg {
@@ -149,7 +149,7 @@ union gensts_reg {
 		u32 rsvd:28;
 	};
 	u32 bits;
-} __packed;
+};
 
 enum idxd_device_status_state {
 	IDXD_DEVICE_STATE_DISABLED = 0,
@@ -183,7 +183,7 @@ union idxd_command_reg {
 		u32 int_req:1;
 	};
 	u32 bits;
-} __packed;
+};
 
 enum idxd_cmd {
 	IDXD_CMD_ENABLE_DEVICE = 1,
@@ -213,7 +213,7 @@ union cmdsts_reg {
 		u8 active:1;
 	};
 	u32 bits;
-} __packed;
+};
 #define IDXD_CMDSTS_ACTIVE		0x80000000
 #define IDXD_CMDSTS_ERR_MASK		0xff
 #define IDXD_CMDSTS_RES_SHIFT		8
@@ -284,7 +284,7 @@ union sw_err_reg {
 		u64 rsvd5;
 	};
 	u64 bits[4];
-} __packed;
+};
 
 union iaa_cap_reg {
 	struct {
@@ -303,7 +303,7 @@ union iaa_cap_reg {
 		u64 rsvd:52;
 	};
 	u64 bits;
-} __packed;
+};
 
 #define IDXD_IAACAP_OFFSET	0x180
 
@@ -320,7 +320,7 @@ union evlcfg_reg {
 		u64 rsvd2:28;
 	};
 	u64 bits[2];
-} __packed;
+};
 
 #define IDXD_EVL_SIZE_MIN	0x0040
 #define IDXD_EVL_SIZE_MAX	0xffff
@@ -334,7 +334,7 @@ union msix_perm {
 		u32 pasid:20;
 	};
 	u32 bits;
-} __packed;
+};
 
 union group_flags {
 	struct {
@@ -352,13 +352,13 @@ union group_flags {
 		u64 rsvd5:26;
 	};
 	u64 bits;
-} __packed;
+};
 
 struct grpcfg {
 	u64 wqs[4];
 	u64 engines;
 	union group_flags flags;
-} __packed;
+};
 
 union wqcfg {
 	struct {
@@ -410,7 +410,7 @@ union wqcfg {
 		u64 op_config[4];
 	};
 	u32 bits[16];
-} __packed;
+};
 
 #define WQCFG_PASID_IDX                2
 #define WQCFG_PRIVL_IDX		2
@@ -474,7 +474,7 @@ union idxd_perfcap {
 		u64 rsvd3:8;
 	};
 	u64 bits;
-} __packed;
+};
 
 #define IDXD_EVNTCAP_OFFSET		0x80
 union idxd_evntcap {
@@ -483,7 +483,7 @@ union idxd_evntcap {
 		u64 rsvd:36;
 	};
 	u64 bits;
-} __packed;
+};
 
 struct idxd_event {
 	union {
@@ -493,7 +493,7 @@ struct idxd_event {
 		};
 		u32 val;
 	};
-} __packed;
+};
 
 #define IDXD_CNTRCAP_OFFSET		0x800
 struct idxd_cntrcap {
@@ -506,7 +506,7 @@ struct idxd_cntrcap {
 		u32 val;
 	};
 	struct idxd_event events[];
-} __packed;
+};
 
 #define IDXD_PERFRST_OFFSET		0x10
 union idxd_perfrst {
@@ -516,7 +516,7 @@ union idxd_perfrst {
 		u32 rsvd:30;
 	};
 	u32 val;
-} __packed;
+};
 
 #define IDXD_OVFSTATUS_OFFSET		0x30
 #define IDXD_PERFFRZ_OFFSET		0x20
@@ -533,7 +533,7 @@ union idxd_cntrcfg {
 		u64 rsvd3:4;
 	};
 	u64 val;
-} __packed;
+};
 
 #define IDXD_FLTCFG_OFFSET		0x300
 
@@ -543,7 +543,7 @@ union idxd_cntrdata {
 		u64 event_count_value;
 	};
 	u64 val;
-} __packed;
+};
 
 union event_cfg {
 	struct {
@@ -551,7 +551,7 @@ union event_cfg {
 		u64 event_enc:28;
 	};
 	u64 val;
-} __packed;
+};
 
 union filter_cfg {
 	struct {
@@ -562,7 +562,7 @@ union filter_cfg {
 		u64 eng:8;
 	};
 	u64 val;
-} __packed;
+};
 
 #define IDXD_EVLSTATUS_OFFSET		0xf0
 
@@ -580,7 +580,7 @@ union evl_status_reg {
 		u32 bits_upper32;
 	};
 	u64 bits;
-} __packed;
+};
 
 #define IDXD_MAX_BATCH_IDENT	256
 
@@ -620,17 +620,17 @@ struct __evl_entry {
 	};
 	u64 fault_addr;
 	u64 rsvd5;
-} __packed;
+};
 
 struct dsa_evl_entry {
 	struct __evl_entry e;
 	struct dsa_completion_record cr;
-} __packed;
+};
 
 struct iax_evl_entry {
 	struct __evl_entry e;
 	u64 rsvd[4];
 	struct iax_completion_record cr;
-} __packed;
+};
 
 #endif
-- 
2.43.0