From: "Christian König" <christian.koenig@amd.com>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-kernel@vger.kernel.org
Cc: David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
Alex Deucher <alexander.deucher@amd.com>,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH 00/14] drm/amd/pm: Replace one-element arrays with flexible-array members
Date: Thu, 8 Oct 2020 09:19:47 +0200 [thread overview]
Message-ID: <d71c8436-334c-45d9-d464-9798e75f2a73@amd.com> (raw)
In-Reply-To: <cover.1602020074.git.gustavoars@kernel.org>
Am 07.10.20 um 18:01 schrieb Gustavo A. R. Silva:
> Hi all,
>
> This series aims to replace one-element arrays with flexible-array
> members.
>
> There is a regular need in the kernel to provide a way to declare having
> a dynamically sized set of trailing elements in a structure. Kernel code
> should always use “flexible array members”[1] for these cases. The older
> style of one-element or zero-length arrays should no longer be used[2].
>
> Refactor the code according to the use of flexible-array members, instead
> of one-element arrays, and use the struct_size() helper to calculate the
> size for the dynamic memory allocation.
>
> Also, save some heap space in the process. More on this on each individual
> patch.
Ah! Nice to see that finally be documented and cleaned up.
Feel free to add an Acked-by: Christian König <christian.koenig@amd.com>
I also know about a case where we don't use struct_size in the DMA-buf code.
I'm the maintainer of that stuff as well, so be prepared to get patches
thrown at you to clean that up as well.
Thanks,
Christian.
>
> This series also addresses multiple of the following sorts of warnings:
>
> drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/smu8_hwmgr.c:1515:37:
> warning: array subscript 1 is above array bounds of ‘const struct
> phm_clock_voltage_dependency_record[1]’ [-Warray-bounds]
>
> which, in this case, they are false positives, but nervertheless should be
> fixed in order to enable -Warray-bounds[3][4].
>
> [1] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FFlexible_array_member&data=02%7C01%7Cchristian.koenig%40amd.com%7C5312862a3b8c41838ef508d86ad969c1%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637376829947099179&sdata=5LEWyR8pYSxmHsqhHiYiOS%2BPPk%2Fm5suOc6H7f5cIBL4%3D&reserved=0
> [2] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.kernel.org%2Fdoc%2Fhtml%2Fv5.9-rc1%2Fprocess%2Fdeprecated.html%23zero-length-and-one-element-arrays&data=02%7C01%7Cchristian.koenig%40amd.com%7C5312862a3b8c41838ef508d86ad969c1%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637376829947099179&sdata=wOqxnNkA9FnOI%2BfB3dHn9RU7cqPJ62qqGCK9gsd2i%2Bo%3D&reserved=0
> [3] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Flinus%2F44720996e2d79e47d508b0abe99b931a726a3197&data=02%7C01%7Cchristian.koenig%40amd.com%7C5312862a3b8c41838ef508d86ad969c1%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637376829947099179&sdata=x%2BSJeOrQA11HXoTaZEdyLyNWL9rC4GngDyoDMRBUn4M%3D&reserved=0
> [4] https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FKSPP%2Flinux%2Fissues%2F109&data=02%7C01%7Cchristian.koenig%40amd.com%7C5312862a3b8c41838ef508d86ad969c1%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637376829947099179&sdata=48155uVo7AboCdSZfsTP10i2rHfBJctG%2F432lD%2BpfHo%3D&reserved=0
>
> Gustavo A. R. Silva (14):
> drm/amd/pm: Replace one-element array with flexible-array member
> drm/amd/pm: Replace one-element array with flexible-array member in
> struct vi_dpm_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_clock_array
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_uvd_clock_voltage_dependency_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_acp_clock_voltage_dependency_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_phase_shedding_limits_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_vce_clock_voltage_dependency_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_cac_leakage_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_samu_clock_voltage_dependency_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_ppt_v1_clock_voltage_dependency_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_ppt_v1_mm_clock_voltage_dependency_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_ppt_v1_voltage_lookup_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> phm_ppt_v1_pcie_table
> drm/amd/pm: Replace one-element array with flexible-array in struct
> ATOM_Vega10_GFXCLK_Dependency_Table
>
> drivers/gpu/drm/amd/pm/inc/hwmgr.h | 20 ++---
> .../drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h | 8 +-
> .../powerplay/hwmgr/process_pptables_v1_0.c | 85 +++++++-----------
> .../amd/pm/powerplay/hwmgr/processpptables.c | 85 +++++++-----------
> .../drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c | 2 +-
> .../drm/amd/pm/powerplay/hwmgr/smu_helper.c | 5 +-
> .../amd/pm/powerplay/hwmgr/vega10_pptable.h | 2 +-
> .../powerplay/hwmgr/vega10_processpptables.c | 88 ++++++-------------
> 8 files changed, 107 insertions(+), 188 deletions(-)
>
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next prev parent reply other threads:[~2020-10-08 7:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 16:01 [PATCH 00/14] drm/amd/pm: Replace one-element arrays with flexible-array members Gustavo A. R. Silva
2020-10-07 16:02 ` [PATCH 01/14] drm/amd/pm: Replace one-element array with flexible-array member Gustavo A. R. Silva
2020-10-07 16:03 ` [PATCH 02/14] drm/amd/pm: Replace one-element array with flexible-array member in struct vi_dpm_table Gustavo A. R. Silva
2020-10-07 16:04 ` [PATCH 03/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_clock_array Gustavo A. R. Silva
2020-10-07 16:04 ` [PATCH 04/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_uvd_clock_voltage_dependency_table Gustavo A. R. Silva
2020-10-07 16:05 ` [PATCH 05/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_acp_clock_voltage_dependency_table Gustavo A. R. Silva
2020-10-07 16:06 ` [PATCH 06/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_phase_shedding_limits_table Gustavo A. R. Silva
2020-10-07 16:06 ` [PATCH 07/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_vce_clock_voltage_dependency_table Gustavo A. R. Silva
2020-10-07 16:07 ` [PATCH 08/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_cac_leakage_table Gustavo A. R. Silva
2020-10-07 16:08 ` [PATCH 09/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_samu_clock_voltage_dependency_table Gustavo A. R. Silva
2020-10-07 16:08 ` [PATCH 10/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_ppt_v1_clock_voltage_dependency_table Gustavo A. R. Silva
2020-10-07 16:09 ` [PATCH 11/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_ppt_v1_mm_clock_voltage_dependency_table Gustavo A. R. Silva
2020-10-07 16:10 ` [PATCH 12/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_ppt_v1_voltage_lookup_table Gustavo A. R. Silva
2020-10-07 16:10 ` [PATCH 13/14] drm/amd/pm: Replace one-element array with flexible-array in struct phm_ppt_v1_pcie_table Gustavo A. R. Silva
2020-10-07 16:11 ` [PATCH 14/14] drm/amd/pm: Replace one-element array with flexible-array in struct ATOM_Vega10_GFXCLK_Dependency_Table Gustavo A. R. Silva
2020-10-08 15:46 ` Alex Deucher
2020-10-08 7:19 ` Christian König [this message]
2020-10-08 13:20 ` [PATCH 00/14] drm/amd/pm: Replace one-element arrays with flexible-array members Gustavo A. R. Silva
2020-10-08 15:53 ` Alex Deucher
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