iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drivers/perf: thunderx2_pmu: Change data in size tx2_uncore_event_update()

Browse Source 
A LSL of 32 requires > 32b value to hold the result. However in
tx2_uncore_event_update(), 1UL << 32 currently only works as unsigned
long is 64b on a 64b system.

If we want to compile test for a 32b system, we need unsigned long long,
whose min size is 64b.

Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1633085326-156653-2-git-send-email-john.garry@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
John Garry 2021-10-01 18:48:45 +08:00 committed by Will Deacon
parent 16cc4af286
commit 78cac393b4
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/perf/thunderx2_pmu.c
View File

@ -487,7 +487,7 @@ static void tx2_uncore_event_update(struct perf_event *event)
new = reg_readl(hwc->event_base);
prev = local64_xchg(&hwc->prev_count, new);
/* handles rollover of 32 bit counter */
delta = (u32)(((1UL << 32) - prev) + new);
delta = (u32)(((1ULL << 32) - prev) + new);
}
/* DMC event data_transfers granularity is 16 Bytes, convert it to 64 */