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build: upgrade to golangci-lint v1.39.0 (#22696)

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* build: upgrade to golangci-lint v1.39.0

* consensus/ethash: fix go vet warning regarding reflect.SliceHeader

* eth/catalyst: fix lint issue

* consensus/ethash: fix bug in memoryMapFile
This commit is contained in:
Felix Lange
2021-04-27 10:49:06 +02:00
committed by GitHub
parent 854f068ed6
commit a3f0da1ac4
4 changed files with 40 additions and 26 deletions
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13
consensus/ethash/ethash.go
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@ -112,12 +112,13 @@ func memoryMapFile(file *os.File, write bool) (mmap.MMap, []uint32, error) {
if err != nil {
return nil, nil, err
}
// Yay, we managed to memory map the file, here be dragons
header := *(*reflect.SliceHeader)(unsafe.Pointer(&mem))
header.Len /= 4
header.Cap /= 4
return mem, *(*[]uint32)(unsafe.Pointer(&header)), nil
// The file is now memory-mapped. Create a []uint32 view of the file.
var view []uint32
header := (*reflect.SliceHeader)(unsafe.Pointer(&view))
header.Data = (*reflect.SliceHeader)(unsafe.Pointer(&mem)).Data
header.Cap = len(mem) / 4
header.Len = header.Cap
return mem, view, nil
}
// memoryMapAndGenerate tries to memory map a temporary file of uint32s for write