linux-kernel - [PATCH] drm/amd/amdgpu: Use “__packed“ instead of "pragma pack()"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230620085543.576733-1-suhui@nfschina.com>
Date:   Tue, 20 Jun 2023 16:55:43 +0800
From:   Su Hui <suhui@...china.com>
To:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch
Cc:     dan.carpenter@...aro.org, Jane.Jian@....com, Likun.Gao@....com,
        David.Francis@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, Su Hui <suhui@...china.com>
Subject: [PATCH] drm/amd/amdgpu: Use “__packed“ instead of "pragma pack()"

use "__packed" is clearer amd better than “pragma pack()”.

Signed-off-by: Su Hui <suhui@...china.com>
---
As Dan Carpenter mentioned:
'"Mark the associated types properly packed individually, rather than
use the disgusting "pragma pack()" that should never be used."
https://lore.kernel.org/linux-sparse/CAHk-=wi7jGZ+bVbt-UfXOkpEQdHzF3Z2HBjkGdjh8q4dvPPGWQ@mail.gmail.com/'
use "__packed" is better.
the previous wrong patch's address:
https://lore.kernel.org/kernel-janitors/c12c4031-52fb-25a2-b411-e668eb9baaa2@tom.com/T/#t
 drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h b/drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h
index 24d42d24e6a0..025adc950026 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgv_sriovmsg.h
@@ -83,8 +83,6 @@ enum amd_sriov_ucode_engine_id {
 	AMD_SRIOV_UCODE_ID__MAX
 };
 
-#pragma pack(push, 1) // PF2VF / VF2PF data areas are byte packed
-
 union amd_sriov_msg_feature_flags {
 	struct {
 		uint32_t error_log_collect : 1;
@@ -210,7 +208,7 @@ struct amd_sriov_msg_pf2vf_info {
 	uint32_t pcie_atomic_ops_support_flags;
 	/* reserved */
 	uint32_t reserved[256 - AMD_SRIOV_MSG_PF2VF_INFO_FILLED_SIZE];
-};
+} __packed;
 
 struct amd_sriov_msg_vf2pf_info_header {
 	/* the total structure size in byte */
@@ -263,7 +261,7 @@ struct amd_sriov_msg_vf2pf_info {
 	struct {
 		uint8_t id;
 		uint32_t version;
-	} ucode_info[AMD_SRIOV_MSG_RESERVE_UCODE];
+	} __packed ucode_info[AMD_SRIOV_MSG_RESERVE_UCODE];
 	uint64_t dummy_page_addr;
 
 	/* reserved */
@@ -301,8 +299,6 @@ enum amd_sriov_gpu_init_data_version {
 	GPU_INIT_DATA_READY_V1 = 1,
 };
 
-#pragma pack(pop) // Restore previous packing option
-
 /* checksum function between host and guest */
 unsigned int amd_sriov_msg_checksum(void *obj, unsigned long obj_size, unsigned int key,
 				    unsigned int checksum);
-- 
2.30.2