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R . Silva" , Miguel Ojeda , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , clang-built-linux@googlegroups.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/3] Revert "lib: Revert use of fallthrough pseudo-keyword in lib/" Message-ID: <20201117030214.GB1340689@ubuntu-m3-large-x86> References: <20201116043532.4032932-1-ndesaulniers@google.com> <20201116043532.4032932-3-ndesaulniers@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201116043532.4032932-3-ndesaulniers@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Nov 15, 2020 at 08:35:31PM -0800, Nick Desaulniers wrote: > This reverts commit 6a9dc5fd6170 ("lib: Revert use of fallthrough > pseudo-keyword in lib/") > > Now that we can build arch/powerpc/boot/ free of -Wimplicit-fallthrough, > re-enable these fixes for lib/. > > Link: https://github.com/ClangBuiltLinux/linux/issues/236 > Signed-off-by: Nick Desaulniers Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor > --- > lib/asn1_decoder.c | 4 ++-- > lib/assoc_array.c | 2 +- > lib/bootconfig.c | 4 ++-- > lib/cmdline.c | 10 +++++----- > lib/dim/net_dim.c | 2 +- > lib/dim/rdma_dim.c | 4 ++-- > lib/glob.c | 2 +- > lib/siphash.c | 36 ++++++++++++++++++------------------ > lib/ts_fsm.c | 2 +- > lib/vsprintf.c | 14 +++++++------- > lib/xz/xz_dec_lzma2.c | 4 ++-- > lib/xz/xz_dec_stream.c | 16 ++++++++-------- > lib/zstd/bitstream.h | 10 +++++----- > lib/zstd/compress.c | 2 +- > lib/zstd/decompress.c | 12 ++++++------ > lib/zstd/huf_compress.c | 4 ++-- > 16 files changed, 64 insertions(+), 64 deletions(-) > > diff --git a/lib/asn1_decoder.c b/lib/asn1_decoder.c > index 58f72b25f8e9..13da529e2e72 100644 > --- a/lib/asn1_decoder.c > +++ b/lib/asn1_decoder.c > @@ -381,7 +381,7 @@ int asn1_ber_decoder(const struct asn1_decoder *decoder, > case ASN1_OP_END_SET_ACT: > if (unlikely(!(flags & FLAG_MATCHED))) > goto tag_mismatch; > - /* fall through */ > + fallthrough; > > case ASN1_OP_END_SEQ: > case ASN1_OP_END_SET_OF: > @@ -448,7 +448,7 @@ int asn1_ber_decoder(const struct asn1_decoder *decoder, > pc += asn1_op_lengths[op]; > goto next_op; > } > - /* fall through */ > + fallthrough; > > case ASN1_OP_ACT: > ret = actions[machine[pc + 1]](context, hdr, tag, data + tdp, len); > diff --git a/lib/assoc_array.c b/lib/assoc_array.c > index 6f4bcf524554..04c98799c3ba 100644 > --- a/lib/assoc_array.c > +++ b/lib/assoc_array.c > @@ -1113,7 +1113,7 @@ struct assoc_array_edit *assoc_array_delete(struct assoc_array *array, > index_key)) > goto found_leaf; > } > - /* fall through */ > + fallthrough; > case assoc_array_walk_tree_empty: > case assoc_array_walk_found_wrong_shortcut: > default: > diff --git a/lib/bootconfig.c b/lib/bootconfig.c > index 649ed44f199c..9f8c70a98fcf 100644 > --- a/lib/bootconfig.c > +++ b/lib/bootconfig.c > @@ -827,7 +827,7 @@ int __init xbc_init(char *buf, const char **emsg, int *epos) > q - 2); > break; > } > - /* fall through */ > + fallthrough; > case '=': > ret = xbc_parse_kv(&p, q, c); > break; > @@ -836,7 +836,7 @@ int __init xbc_init(char *buf, const char **emsg, int *epos) > break; > case '#': > q = skip_comment(q); > - /* fall through */ > + fallthrough; > case ';': > case '\n': > ret = xbc_parse_key(&p, q); > diff --git a/lib/cmdline.c b/lib/cmdline.c > index 9e186234edc0..46f2cb4ce6d1 100644 > --- a/lib/cmdline.c > +++ b/lib/cmdline.c > @@ -144,23 +144,23 @@ unsigned long long memparse(const char *ptr, char **retptr) > case 'E': > case 'e': > ret <<= 10; > - /* fall through */ > + fallthrough; > case 'P': > case 'p': > ret <<= 10; > - /* fall through */ > + fallthrough; > case 'T': > case 't': > ret <<= 10; > - /* fall through */ > + fallthrough; > case 'G': > case 'g': > ret <<= 10; > - /* fall through */ > + fallthrough; > case 'M': > case 'm': > ret <<= 10; > - /* fall through */ > + fallthrough; > case 'K': > case 'k': > ret <<= 10; > diff --git a/lib/dim/net_dim.c b/lib/dim/net_dim.c > index a4db51c21266..06811d866775 100644 > --- a/lib/dim/net_dim.c > +++ b/lib/dim/net_dim.c > @@ -233,7 +233,7 @@ void net_dim(struct dim *dim, struct dim_sample end_sample) > schedule_work(&dim->work); > break; > } > - /* fall through */ > + fallthrough; > case DIM_START_MEASURE: > dim_update_sample(end_sample.event_ctr, end_sample.pkt_ctr, > end_sample.byte_ctr, &dim->start_sample); > diff --git a/lib/dim/rdma_dim.c b/lib/dim/rdma_dim.c > index f7e26c7b4749..15462d54758d 100644 > --- a/lib/dim/rdma_dim.c > +++ b/lib/dim/rdma_dim.c > @@ -59,7 +59,7 @@ static bool rdma_dim_decision(struct dim_stats *curr_stats, struct dim *dim) > break; > case DIM_STATS_WORSE: > dim_turn(dim); > - /* fall through */ > + fallthrough; > case DIM_STATS_BETTER: > step_res = rdma_dim_step(dim); > if (step_res == DIM_ON_EDGE) > @@ -94,7 +94,7 @@ void rdma_dim(struct dim *dim, u64 completions) > schedule_work(&dim->work); > break; > } > - /* fall through */ > + fallthrough; > case DIM_START_MEASURE: > dim->state = DIM_MEASURE_IN_PROGRESS; > dim_update_sample_with_comps(curr_sample->event_ctr, 0, 0, > diff --git a/lib/glob.c b/lib/glob.c > index 52e3ed7e4a9b..85ecbda45cd8 100644 > --- a/lib/glob.c > +++ b/lib/glob.c > @@ -102,7 +102,7 @@ bool __pure glob_match(char const *pat, char const *str) > break; > case '\\': > d = *pat++; > - /* fall through */ > + fallthrough; > default: /* Literal character */ > literal: > if (c == d) { > diff --git a/lib/siphash.c b/lib/siphash.c > index c47bb6ff2149..a90112ee72a1 100644 > --- a/lib/siphash.c > +++ b/lib/siphash.c > @@ -68,11 +68,11 @@ u64 __siphash_aligned(const void *data, size_t len, const siphash_key_t *key) > bytemask_from_count(left))); > #else > switch (left) { > - case 7: b |= ((u64)end[6]) << 48; /* fall through */ > - case 6: b |= ((u64)end[5]) << 40; /* fall through */ > - case 5: b |= ((u64)end[4]) << 32; /* fall through */ > + case 7: b |= ((u64)end[6]) << 48; fallthrough; > + case 6: b |= ((u64)end[5]) << 40; fallthrough; > + case 5: b |= ((u64)end[4]) << 32; fallthrough; > case 4: b |= le32_to_cpup(data); break; > - case 3: b |= ((u64)end[2]) << 16; /* fall through */ > + case 3: b |= ((u64)end[2]) << 16; fallthrough; > case 2: b |= le16_to_cpup(data); break; > case 1: b |= end[0]; > } > @@ -101,11 +101,11 @@ u64 __siphash_unaligned(const void *data, size_t len, const siphash_key_t *key) > bytemask_from_count(left))); > #else > switch (left) { > - case 7: b |= ((u64)end[6]) << 48; /* fall through */ > - case 6: b |= ((u64)end[5]) << 40; /* fall through */ > - case 5: b |= ((u64)end[4]) << 32; /* fall through */ > + case 7: b |= ((u64)end[6]) << 48; fallthrough; > + case 6: b |= ((u64)end[5]) << 40; fallthrough; > + case 5: b |= ((u64)end[4]) << 32; fallthrough; > case 4: b |= get_unaligned_le32(end); break; > - case 3: b |= ((u64)end[2]) << 16; /* fall through */ > + case 3: b |= ((u64)end[2]) << 16; fallthrough; > case 2: b |= get_unaligned_le16(end); break; > case 1: b |= end[0]; > } > @@ -268,11 +268,11 @@ u32 __hsiphash_aligned(const void *data, size_t len, const hsiphash_key_t *key) > bytemask_from_count(left))); > #else > switch (left) { > - case 7: b |= ((u64)end[6]) << 48; /* fall through */ > - case 6: b |= ((u64)end[5]) << 40; /* fall through */ > - case 5: b |= ((u64)end[4]) << 32; /* fall through */ > + case 7: b |= ((u64)end[6]) << 48; fallthrough; > + case 6: b |= ((u64)end[5]) << 40; fallthrough; > + case 5: b |= ((u64)end[4]) << 32; fallthrough; > case 4: b |= le32_to_cpup(data); break; > - case 3: b |= ((u64)end[2]) << 16; /* fall through */ > + case 3: b |= ((u64)end[2]) << 16; fallthrough; > case 2: b |= le16_to_cpup(data); break; > case 1: b |= end[0]; > } > @@ -301,11 +301,11 @@ u32 __hsiphash_unaligned(const void *data, size_t len, > bytemask_from_count(left))); > #else > switch (left) { > - case 7: b |= ((u64)end[6]) << 48; /* fall through */ > - case 6: b |= ((u64)end[5]) << 40; /* fall through */ > - case 5: b |= ((u64)end[4]) << 32; /* fall through */ > + case 7: b |= ((u64)end[6]) << 48; fallthrough; > + case 6: b |= ((u64)end[5]) << 40; fallthrough; > + case 5: b |= ((u64)end[4]) << 32; fallthrough; > case 4: b |= get_unaligned_le32(end); break; > - case 3: b |= ((u64)end[2]) << 16; /* fall through */ > + case 3: b |= ((u64)end[2]) << 16; fallthrough; > case 2: b |= get_unaligned_le16(end); break; > case 1: b |= end[0]; > } > @@ -431,7 +431,7 @@ u32 __hsiphash_aligned(const void *data, size_t len, const hsiphash_key_t *key) > v0 ^= m; > } > switch (left) { > - case 3: b |= ((u32)end[2]) << 16; /* fall through */ > + case 3: b |= ((u32)end[2]) << 16; fallthrough; > case 2: b |= le16_to_cpup(data); break; > case 1: b |= end[0]; > } > @@ -454,7 +454,7 @@ u32 __hsiphash_unaligned(const void *data, size_t len, > v0 ^= m; > } > switch (left) { > - case 3: b |= ((u32)end[2]) << 16; /* fall through */ > + case 3: b |= ((u32)end[2]) << 16; fallthrough; > case 2: b |= get_unaligned_le16(end); break; > case 1: b |= end[0]; > } > diff --git a/lib/ts_fsm.c b/lib/ts_fsm.c > index ab749ec10ab5..64fd9015ad80 100644 > --- a/lib/ts_fsm.c > +++ b/lib/ts_fsm.c > @@ -193,7 +193,7 @@ static unsigned int fsm_find(struct ts_config *conf, struct ts_state *state) > TOKEN_MISMATCH(); > > block_idx++; > - /* fall through */ > + fallthrough; > > case TS_FSM_ANY: > if (next == NULL) > diff --git a/lib/vsprintf.c b/lib/vsprintf.c > index 14c9a6af1b23..d3c5c16f391c 100644 > --- a/lib/vsprintf.c > +++ b/lib/vsprintf.c > @@ -1265,7 +1265,7 @@ char *mac_address_string(char *buf, char *end, u8 *addr, > > case 'R': > reversed = true; > - /* fall through */ > + fallthrough; > > default: > separator = ':'; > @@ -1682,7 +1682,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr, > switch (*(++fmt)) { > case 'L': > uc = true; > - /* fall through */ > + fallthrough; > case 'l': > index = guid_index; > break; > @@ -2219,7 +2219,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, > case 'S': > case 's': > ptr = dereference_symbol_descriptor(ptr); > - /* fall through */ > + fallthrough; > case 'B': > return symbol_string(buf, end, ptr, spec, fmt); > case 'R': > @@ -2450,7 +2450,7 @@ int format_decode(const char *fmt, struct printf_spec *spec) > > case 'x': > spec->flags |= SMALL; > - /* fall through */ > + fallthrough; > > case 'X': > spec->base = 16; > @@ -2468,7 +2468,7 @@ int format_decode(const char *fmt, struct printf_spec *spec) > * utility, treat it as any other invalid or > * unsupported format specifier. > */ > - /* fall through */ > + fallthrough; > > default: > WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); > @@ -3411,10 +3411,10 @@ int vsscanf(const char *buf, const char *fmt, va_list args) > break; > case 'i': > base = 0; > - /* fall through */ > + fallthrough; > case 'd': > is_sign = true; > - /* fall through */ > + fallthrough; > case 'u': > break; > case '%': > diff --git a/lib/xz/xz_dec_lzma2.c b/lib/xz/xz_dec_lzma2.c > index 65a1aad8c223..ca2603abee08 100644 > --- a/lib/xz/xz_dec_lzma2.c > +++ b/lib/xz/xz_dec_lzma2.c > @@ -1043,7 +1043,7 @@ XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, > > s->lzma2.sequence = SEQ_LZMA_PREPARE; > > - /* fall through */ > + fallthrough; > > case SEQ_LZMA_PREPARE: > if (s->lzma2.compressed < RC_INIT_BYTES) > @@ -1055,7 +1055,7 @@ XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s, > s->lzma2.compressed -= RC_INIT_BYTES; > s->lzma2.sequence = SEQ_LZMA_RUN; > > - /* fall through */ > + fallthrough; > > case SEQ_LZMA_RUN: > /* > diff --git a/lib/xz/xz_dec_stream.c b/lib/xz/xz_dec_stream.c > index 32ab2a08b7cb..fea86deaaa01 100644 > --- a/lib/xz/xz_dec_stream.c > +++ b/lib/xz/xz_dec_stream.c > @@ -583,7 +583,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > if (ret != XZ_OK) > return ret; > > - /* fall through */ > + fallthrough; > > case SEQ_BLOCK_START: > /* We need one byte of input to continue. */ > @@ -608,7 +608,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > s->temp.pos = 0; > s->sequence = SEQ_BLOCK_HEADER; > > - /* fall through */ > + fallthrough; > > case SEQ_BLOCK_HEADER: > if (!fill_temp(s, b)) > @@ -620,7 +620,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > > s->sequence = SEQ_BLOCK_UNCOMPRESS; > > - /* fall through */ > + fallthrough; > > case SEQ_BLOCK_UNCOMPRESS: > ret = dec_block(s, b); > @@ -629,7 +629,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > > s->sequence = SEQ_BLOCK_PADDING; > > - /* fall through */ > + fallthrough; > > case SEQ_BLOCK_PADDING: > /* > @@ -651,7 +651,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > > s->sequence = SEQ_BLOCK_CHECK; > > - /* fall through */ > + fallthrough; > > case SEQ_BLOCK_CHECK: > if (s->check_type == XZ_CHECK_CRC32) { > @@ -675,7 +675,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > > s->sequence = SEQ_INDEX_PADDING; > > - /* fall through */ > + fallthrough; > > case SEQ_INDEX_PADDING: > while ((s->index.size + (b->in_pos - s->in_start)) > @@ -699,7 +699,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > > s->sequence = SEQ_INDEX_CRC32; > > - /* fall through */ > + fallthrough; > > case SEQ_INDEX_CRC32: > ret = crc32_validate(s, b); > @@ -709,7 +709,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b) > s->temp.size = STREAM_HEADER_SIZE; > s->sequence = SEQ_STREAM_FOOTER; > > - /* fall through */ > + fallthrough; > > case SEQ_STREAM_FOOTER: > if (!fill_temp(s, b)) > diff --git a/lib/zstd/bitstream.h b/lib/zstd/bitstream.h > index 3a49784d5c61..7c65c66e41fd 100644 > --- a/lib/zstd/bitstream.h > +++ b/lib/zstd/bitstream.h > @@ -259,15 +259,15 @@ ZSTD_STATIC size_t BIT_initDStream(BIT_DStream_t *bitD, const void *srcBuffer, s > bitD->bitContainer = *(const BYTE *)(bitD->start); > switch (srcSize) { > case 7: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[6]) << (sizeof(bitD->bitContainer) * 8 - 16); > - /* fall through */ > + fallthrough; > case 6: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[5]) << (sizeof(bitD->bitContainer) * 8 - 24); > - /* fall through */ > + fallthrough; > case 5: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[4]) << (sizeof(bitD->bitContainer) * 8 - 32); > - /* fall through */ > + fallthrough; > case 4: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[3]) << 24; > - /* fall through */ > + fallthrough; > case 3: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[2]) << 16; > - /* fall through */ > + fallthrough; > case 2: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[1]) << 8; > default:; > } > diff --git a/lib/zstd/compress.c b/lib/zstd/compress.c > index 5e0b67003e55..b080264ed3ad 100644 > --- a/lib/zstd/compress.c > +++ b/lib/zstd/compress.c > @@ -3182,7 +3182,7 @@ static size_t ZSTD_compressStream_generic(ZSTD_CStream *zcs, void *dst, size_t * > zcs->outBuffFlushedSize = 0; > zcs->stage = zcss_flush; /* pass-through to flush stage */ > } > - /* fall through */ > + fallthrough; > > case zcss_flush: { > size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize; > diff --git a/lib/zstd/decompress.c b/lib/zstd/decompress.c > index db6761ea4deb..66cd487a326a 100644 > --- a/lib/zstd/decompress.c > +++ b/lib/zstd/decompress.c > @@ -442,7 +442,7 @@ size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx *dctx, const void *src, size_t srcSize > case set_repeat: > if (dctx->litEntropy == 0) > return ERROR(dictionary_corrupted); > - /* fall through */ > + fallthrough; > case set_compressed: > if (srcSize < 5) > return ERROR(corruption_detected); /* srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for case 3 */ > @@ -1768,7 +1768,7 @@ size_t ZSTD_decompressContinue(ZSTD_DCtx *dctx, void *dst, size_t dstCapacity, c > return 0; > } > dctx->expected = 0; /* not necessary to copy more */ > - /* fall through */ > + fallthrough; > > case ZSTDds_decodeFrameHeader: > memcpy(dctx->headerBuffer + ZSTD_frameHeaderSize_prefix, src, dctx->expected); > @@ -2309,7 +2309,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream *zds, ZSTD_outBuffer *output, ZSTD_inB > switch (zds->stage) { > case zdss_init: > ZSTD_resetDStream(zds); /* transparent reset on starting decoding a new frame */ > - /* fall through */ > + fallthrough; > > case zdss_loadHeader: { > size_t const hSize = ZSTD_getFrameParams(&zds->fParams, zds->headerBuffer, zds->lhSize); > @@ -2376,7 +2376,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream *zds, ZSTD_outBuffer *output, ZSTD_inB > } > zds->stage = zdss_read; > } > - /* fall through */ > + fallthrough; > > case zdss_read: { > size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zds->dctx); > @@ -2405,7 +2405,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream *zds, ZSTD_outBuffer *output, ZSTD_inB > zds->stage = zdss_load; > /* pass-through */ > } > - /* fall through */ > + fallthrough; > > case zdss_load: { > size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zds->dctx); > @@ -2438,7 +2438,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream *zds, ZSTD_outBuffer *output, ZSTD_inB > /* pass-through */ > } > } > - /* fall through */ > + fallthrough; > > case zdss_flush: { > size_t const toFlushSize = zds->outEnd - zds->outStart; > diff --git a/lib/zstd/huf_compress.c b/lib/zstd/huf_compress.c > index e727812d12aa..08b4ae80aed4 100644 > --- a/lib/zstd/huf_compress.c > +++ b/lib/zstd/huf_compress.c > @@ -556,9 +556,9 @@ size_t HUF_compress1X_usingCTable(void *dst, size_t dstSize, const void *src, si > n = srcSize & ~3; /* join to mod 4 */ > switch (srcSize & 3) { > case 3: HUF_encodeSymbol(&bitC, ip[n + 2], CTable); HUF_FLUSHBITS_2(&bitC); > - /* fall through */ > + fallthrough; > case 2: HUF_encodeSymbol(&bitC, ip[n + 1], CTable); HUF_FLUSHBITS_1(&bitC); > - /* fall through */ > + fallthrough; > case 1: HUF_encodeSymbol(&bitC, ip[n + 0], CTable); HUF_FLUSHBITS(&bitC); > case 0: > default:; > -- > 2.29.2.299.gdc1121823c-goog >