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Message-ID: <20230706100133-mutt-send-email-mst@kernel.org>
Date: Thu, 6 Jul 2023 10:02:13 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Yang Rong <yangrong@...o.com>
Cc: Harry Wentland <harry.wentland@....com>,
Leo Li <sunpeng.li@....com>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Jens Axboe <axboe@...nel.dk>,
Pavel Begunkov <asml.silence@...il.com>,
Alvin Lee <Alvin.Lee2@....com>, Jun Lei <Jun.Lei@....com>,
Qingqing Zhuo <qingqing.zhuo@....com>,
Max Tseng <Max.Tseng@....com>,
Josip Pavic <Josip.Pavic@....com>,
Cruise Hung <cruise.hung@....com>,
"open list:AMD DISPLAY CORE" <amd-gfx@...ts.freedesktop.org>,
"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:VIRTIO CORE AND NET DRIVERS"
<virtualization@...ts.linux-foundation.org>,
"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
"open list:IO_URING" <io-uring@...r.kernel.org>,
opensource.kernel@...o.com, luhongfei@...o.com
Subject: Re: [PATCH] Fix max/min warnings in virtio_net, amd/display, and
io_uring
On Thu, Jul 06, 2023 at 10:06:16AM +0800, Yang Rong wrote:
> The files drivers/net/virtio_net.c, drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c, and io_uring/io_uring.c were modified to fix warnings.
what warnings? the point of the warning is to analyze it not "fix" it
blindly.
> Specifically, the opportunities for max() and min() were utilized to address the warnings.
>
> Signed-off-by: Yang Rong <yangrong@...o.com>
> ---
> drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 6 +++---
> drivers/net/virtio_net.c | 3 ++-
> io_uring/io_uring.c | 3 ++-
> 3 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
> index c753c6f30dd7..df79aea49a3c 100644
> --- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
> +++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
> @@ -22,7 +22,7 @@
> * Authors: AMD
> *
> */
> -
> +#include <linux/minmax.h>
> #include "dc.h"
> #include "dc_dmub_srv.h"
> #include "../dmub/dmub_srv.h"
> @@ -481,7 +481,7 @@ static void populate_subvp_cmd_drr_info(struct dc *dc,
> max_drr_vblank_us = div64_u64((subvp_active_us - prefetch_us -
> dc->caps.subvp_fw_processing_delay_us - drr_active_us), 2) + drr_active_us;
> max_drr_mallregion_us = subvp_active_us - prefetch_us - mall_region_us - dc->caps.subvp_fw_processing_delay_us;
> - max_drr_supported_us = max_drr_vblank_us > max_drr_mallregion_us ? max_drr_vblank_us : max_drr_mallregion_us;
> + max_drr_supported_us = max(max_drr_vblank_us, max_drr_mallregion_us);
> max_vtotal_supported = div64_u64(((uint64_t)drr_timing->pix_clk_100hz * 100 * max_drr_supported_us),
> (((uint64_t)drr_timing->h_total * 1000000)));
>
> @@ -771,7 +771,7 @@ void dc_dmub_setup_subvp_dmub_command(struct dc *dc,
> wm_val_refclk = context->bw_ctx.bw.dcn.watermarks.a.cstate_pstate.pstate_change_ns *
> (dc->res_pool->ref_clocks.dchub_ref_clock_inKhz / 1000) / 1000;
>
> - cmd.fw_assisted_mclk_switch_v2.config_data.watermark_a_cache = wm_val_refclk < 0xFFFF ? wm_val_refclk : 0xFFFF;
> + cmd.fw_assisted_mclk_switch_v2.config_data.watermark_a_cache = min(wm_val_refclk, 0xFFFF);
> }
>
> dm_execute_dmub_cmd(dc->ctx, &cmd, DM_DMUB_WAIT_TYPE_WAIT);
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 9b3721424e71..5bb7da885f00 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -22,6 +22,7 @@
> #include <net/route.h>
> #include <net/xdp.h>
> #include <net/net_failover.h>
> +#include <linux/minmax.h>
>
> static int napi_weight = NAPI_POLL_WEIGHT;
> module_param(napi_weight, int, 0444);
> @@ -1291,7 +1292,7 @@ static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev,
> __skb_put(skb, data_len);
>
> metasize = xdp->data - xdp->data_meta;
> - metasize = metasize > 0 ? metasize : 0;
> + metasize = max(metasize, 0);
> if (metasize)
> skb_metadata_set(skb, metasize);
>
> diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
> index e8096d502a7c..875ca657227d 100644
> --- a/io_uring/io_uring.c
> +++ b/io_uring/io_uring.c
> @@ -47,6 +47,7 @@
> #include <linux/refcount.h>
> #include <linux/uio.h>
> #include <linux/bits.h>
> +#include <linux/minmax.h>
>
> #include <linux/sched/signal.h>
> #include <linux/fs.h>
> @@ -2660,7 +2661,7 @@ static void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
> page_array);
> if (ret != nr_pages) {
> err:
> - io_pages_free(&page_array, ret > 0 ? ret : 0);
> + io_pages_free(&page_array, max(ret, 0));
> return ret < 0 ? ERR_PTR(ret) : ERR_PTR(-EFAULT);
> }
> /*
> --
> 2.35.3
>
>
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