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Message-ID: <CADnq5_Pr1=69rwce-bkDA7y-16MgYwCg8z2ghOvDqooMMj3r6A@mail.gmail.com>
Date: Fri, 5 Jul 2019 16:32:39 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Fuqian Huang <huangfq.daxian@...il.com>
Cc: David Zhou <David1.Zhou@....com>, David Airlie <airlied@...ux.ie>,
LKML <linux-kernel@...r.kernel.org>,
amd-gfx list <amd-gfx@...ts.freedesktop.org>,
Leo Li <sunpeng.li@....com>,
Maling list - DRI developers
<dri-devel@...ts.freedesktop.org>, Daniel Vetter <daniel@...ll.ch>,
Alex Deucher <alexander.deucher@....com>,
Harry Wentland <harry.wentland@....com>,
Christian König <christian.koenig@....com>
Subject: Re: [PATCH v2 07/35] drm/amdgpu: Use kmemdup rather than duplicating
its implementation
On Wed, Jul 3, 2019 at 1:13 PM Fuqian Huang <huangfq.daxian@...il.com> wrote:
>
> kmemdup is introduced to duplicate a region of memory in a neat way.
> Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
> write the size twice (sometimes lead to mistakes), kmemdup improves
> readability, leads to smaller code and also reduce the chances of mistakes.
> Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.
>
> Reviewed-by: Emil Velikov <emil.velikov@...labora.com>
> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
> ---
> Changes in v2:
> - Fix a typo in commit message (memset -> memcpy)
>
> drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 5 ++---
> drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 5 ++---
> drivers/gpu/drm/amd/display/dc/core/dc.c | 6 ++----
> drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 4 +---
> 4 files changed, 7 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> index 02955e6e9dd9..48e38479d634 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> @@ -3925,11 +3925,10 @@ static int gfx_v8_0_init_save_restore_list(struct amdgpu_device *adev)
>
> int list_size;
> unsigned int *register_list_format =
> - kmalloc(adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
> + kmemdup(adev->gfx.rlc.register_list_format,
> + adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
> if (!register_list_format)
> return -ENOMEM;
> - memcpy(register_list_format, adev->gfx.rlc.register_list_format,
> - adev->gfx.rlc.reg_list_format_size_bytes);
>
> gfx_v8_0_parse_ind_reg_list(register_list_format,
> RLC_FormatDirectRegListLength,
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> index b610e3b30d95..09d901ef216d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> @@ -2092,11 +2092,10 @@ static int gfx_v9_1_init_rlc_save_restore_list(struct amdgpu_device *adev)
> u32 tmp = 0;
>
> u32 *register_list_format =
> - kmalloc(adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
> + kmemdup(adev->gfx.rlc.register_list_format,
> + adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
> if (!register_list_format)
> return -ENOMEM;
> - memcpy(register_list_format, adev->gfx.rlc.register_list_format,
> - adev->gfx.rlc.reg_list_format_size_bytes);
>
> /* setup unique_indirect_regs array and indirect_start_offsets array */
> unique_indirect_reg_count = ARRAY_SIZE(unique_indirect_regs);
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
> index 18c775a950cc..6ced3b9cdce2 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
> @@ -1263,14 +1263,12 @@ struct dc_state *dc_create_state(struct dc *dc)
> struct dc_state *dc_copy_state(struct dc_state *src_ctx)
> {
> int i, j;
> - struct dc_state *new_ctx = kzalloc(sizeof(struct dc_state),
> - GFP_KERNEL);
> + struct dc_state *new_ctx = kmemdup(src_ctx,
> + sizeof(struct dc_state), GFP_KERNEL);
>
> if (!new_ctx)
> return NULL;
>
> - memcpy(new_ctx, src_ctx, sizeof(struct dc_state));
> -
> for (i = 0; i < MAX_PIPES; i++) {
> struct pipe_ctx *cur_pipe = &new_ctx->res_ctx.pipe_ctx[i];
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
> index 96e97d25d639..d4b563a2e220 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
> @@ -167,12 +167,10 @@ struct dc_stream_state *dc_copy_stream(const struct dc_stream_state *stream)
> {
> struct dc_stream_state *new_stream;
>
> - new_stream = kzalloc(sizeof(struct dc_stream_state), GFP_KERNEL);
> + new_stream = kzalloc(stream, sizeof(struct dc_stream_state), GFP_KERNEL);
This doesn't compile. I've gone ahead and fixed it up locally and
applied it. Please check that your patches compile before sending
them out.
Thanks,
Alex
> if (!new_stream)
> return NULL;
>
> - memcpy(new_stream, stream, sizeof(struct dc_stream_state));
> -
> if (new_stream->sink)
> dc_sink_retain(new_stream->sink);
>
> --
> 2.11.0
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
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