6a9dc5fd61
The following build error for powerpc64 was reported by Nathan Chancellor:
"$ scripts/config --file arch/powerpc/configs/powernv_defconfig -e KERNEL_XZ
$ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux- distclean powernv_defconfig zImage
...
In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:234,
from arch/powerpc/boot/decompress.c:38:
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c: In function 'dec_main':
arch/powerpc/boot/../../../lib/xz/xz_dec_stream.c:586:4: error: 'fallthrough' undeclared (first use in this function)
586 | fallthrough;
| ^~~~~~~~~~~
This will end up affecting distribution configurations such as Debian
and OpenSUSE according to my testing. I am not sure what the solution
is, the PowerPC wrapper does not set -D__KERNEL__ so I am not sure
that compiler_attributes.h can be safely included."
In order to avoid these sort of problems, it seems that the best
solution is to use /* fall through */ comments instead of the
fallthrough pseudo-keyword macro in lib/, for now.
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Fixes: df561f6688fe ("treewide: Use fallthrough pseudo-keyword")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-and-tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
|
|
/*
|
|
* Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/dim.h>
|
|
|
|
static int rdma_dim_step(struct dim *dim)
|
|
{
|
|
if (dim->tune_state == DIM_GOING_RIGHT) {
|
|
if (dim->profile_ix == (RDMA_DIM_PARAMS_NUM_PROFILES - 1))
|
|
return DIM_ON_EDGE;
|
|
dim->profile_ix++;
|
|
dim->steps_right++;
|
|
}
|
|
if (dim->tune_state == DIM_GOING_LEFT) {
|
|
if (dim->profile_ix == 0)
|
|
return DIM_ON_EDGE;
|
|
dim->profile_ix--;
|
|
dim->steps_left++;
|
|
}
|
|
|
|
return DIM_STEPPED;
|
|
}
|
|
|
|
static int rdma_dim_stats_compare(struct dim_stats *curr,
|
|
struct dim_stats *prev)
|
|
{
|
|
/* first stat */
|
|
if (!prev->cpms)
|
|
return DIM_STATS_SAME;
|
|
|
|
if (IS_SIGNIFICANT_DIFF(curr->cpms, prev->cpms))
|
|
return (curr->cpms > prev->cpms) ? DIM_STATS_BETTER :
|
|
DIM_STATS_WORSE;
|
|
|
|
if (IS_SIGNIFICANT_DIFF(curr->cpe_ratio, prev->cpe_ratio))
|
|
return (curr->cpe_ratio > prev->cpe_ratio) ? DIM_STATS_BETTER :
|
|
DIM_STATS_WORSE;
|
|
|
|
return DIM_STATS_SAME;
|
|
}
|
|
|
|
static bool rdma_dim_decision(struct dim_stats *curr_stats, struct dim *dim)
|
|
{
|
|
int prev_ix = dim->profile_ix;
|
|
u8 state = dim->tune_state;
|
|
int stats_res;
|
|
int step_res;
|
|
|
|
if (state != DIM_PARKING_ON_TOP && state != DIM_PARKING_TIRED) {
|
|
stats_res = rdma_dim_stats_compare(curr_stats,
|
|
&dim->prev_stats);
|
|
|
|
switch (stats_res) {
|
|
case DIM_STATS_SAME:
|
|
if (curr_stats->cpe_ratio <= 50 * prev_ix)
|
|
dim->profile_ix = 0;
|
|
break;
|
|
case DIM_STATS_WORSE:
|
|
dim_turn(dim);
|
|
/* fall through */
|
|
case DIM_STATS_BETTER:
|
|
step_res = rdma_dim_step(dim);
|
|
if (step_res == DIM_ON_EDGE)
|
|
dim_turn(dim);
|
|
break;
|
|
}
|
|
}
|
|
|
|
dim->prev_stats = *curr_stats;
|
|
|
|
return dim->profile_ix != prev_ix;
|
|
}
|
|
|
|
void rdma_dim(struct dim *dim, u64 completions)
|
|
{
|
|
struct dim_sample *curr_sample = &dim->measuring_sample;
|
|
struct dim_stats curr_stats;
|
|
u32 nevents;
|
|
|
|
dim_update_sample_with_comps(curr_sample->event_ctr + 1, 0, 0,
|
|
curr_sample->comp_ctr + completions,
|
|
&dim->measuring_sample);
|
|
|
|
switch (dim->state) {
|
|
case DIM_MEASURE_IN_PROGRESS:
|
|
nevents = curr_sample->event_ctr - dim->start_sample.event_ctr;
|
|
if (nevents < DIM_NEVENTS)
|
|
break;
|
|
dim_calc_stats(&dim->start_sample, curr_sample, &curr_stats);
|
|
if (rdma_dim_decision(&curr_stats, dim)) {
|
|
dim->state = DIM_APPLY_NEW_PROFILE;
|
|
schedule_work(&dim->work);
|
|
break;
|
|
}
|
|
/* fall through */
|
|
case DIM_START_MEASURE:
|
|
dim->state = DIM_MEASURE_IN_PROGRESS;
|
|
dim_update_sample_with_comps(curr_sample->event_ctr, 0, 0,
|
|
curr_sample->comp_ctr,
|
|
&dim->start_sample);
|
|
break;
|
|
case DIM_APPLY_NEW_PROFILE:
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(rdma_dim);
|