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lib: Revert use of fallthrough pseudo-keyword in lib/

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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: df561f6688 ("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>
This commit is contained in:
Gustavo A. R. Silva 2020-08-24 15:36:14 -05:00 committed by Linus Torvalds
parent 9907ab3714
commit 6a9dc5fd61
16 changed files with 64 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/asn1_decoder.c
View File

@ -381,7 +381,7 @@ next_op:
case ASN1_OP_END_SET_ACT:
if (unlikely(!(flags & FLAG_MATCHED)))
goto tag_mismatch;
fallthrough;
/* fall through */
case ASN1_OP_END_SEQ:
case ASN1_OP_END_SET_OF:
@ -448,7 +448,7 @@ next_op:
pc += asn1_op_lengths[op];
goto next_op;
}
fallthrough;
/* fall through */
case ASN1_OP_ACT:
ret = actions[machine[pc + 1]](context, hdr, tag, data + tdp, len);

2
lib/assoc_array.c
View File

@ -1113,7 +1113,7 @@ struct assoc_array_edit *assoc_array_delete(struct assoc_array *array,
index_key))
goto found_leaf;
}
fallthrough;
/* fall through */
case assoc_array_walk_tree_empty:
case assoc_array_walk_found_wrong_shortcut:
default:

4
lib/bootconfig.c
View File

@ -817,7 +817,7 @@ int __init xbc_init(char *buf, const char **emsg, int *epos)
q - 2);
break;
}
fallthrough;
/* fall through */
case '=':
ret = xbc_parse_kv(&p, q, c);
break;
@ -826,7 +826,7 @@ int __init xbc_init(char *buf, const char **emsg, int *epos)
break;
case '#':
q = skip_comment(q);
fallthrough;
/* fall through */
case ';':
case '\n':
ret = xbc_parse_key(&p, q);

10
lib/cmdline.c
View File

@ -132,23 +132,23 @@ unsigned long long memparse(const char *ptr, char **retptr)
case 'E':
case 'e':
ret <<= 10;
fallthrough;
/* fall through */
case 'P':
case 'p':
ret <<= 10;
fallthrough;
/* fall through */
case 'T':
case 't':
ret <<= 10;
fallthrough;
/* fall through */
case 'G':
case 'g':
ret <<= 10;
fallthrough;
/* fall through */
case 'M':
case 'm':
ret <<= 10;
fallthrough;
/* fall through */
case 'K':
case 'k':
ret <<= 10;

2
lib/dim/net_dim.c
View File

@ -233,7 +233,7 @@ void net_dim(struct dim *dim, struct dim_sample end_sample)
schedule_work(&dim->work);
break;
}
fallthrough;
/* fall through */
case DIM_START_MEASURE:
dim_update_sample(end_sample.event_ctr, end_sample.pkt_ctr,
end_sample.byte_ctr, &dim->start_sample);

4
lib/dim/rdma_dim.c
View File

@ -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);
fallthrough;
/* fall through */
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;
}
fallthrough;
/* fall through */
case DIM_START_MEASURE:
dim->state = DIM_MEASURE_IN_PROGRESS;
dim_update_sample_with_comps(curr_sample->event_ctr, 0, 0,

2
lib/glob.c
View File

@ -102,7 +102,7 @@ bool __pure glob_match(char const *pat, char const *str)
break;
case '\\':
d = *pat++;
fallthrough;
/* fall through */
default: /* Literal character */
literal:
if (c == d) {

36
lib/siphash.c
View File

@ -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; fallthrough;
case 6: b |= ((u64)end[5]) << 40; fallthrough;
case 5: b |= ((u64)end[4]) << 32; fallthrough;
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 4: b |= le32_to_cpup(data); break;
case 3: b |= ((u64)end[2]) << 16; fallthrough;
case 3: b |= ((u64)end[2]) << 16; /* fall through */
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; fallthrough;
case 6: b |= ((u64)end[5]) << 40; fallthrough;
case 5: b |= ((u64)end[4]) << 32; fallthrough;
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 4: b |= get_unaligned_le32(end); break;
case 3: b |= ((u64)end[2]) << 16; fallthrough;
case 3: b |= ((u64)end[2]) << 16; /* fall through */
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; fallthrough;
case 6: b |= ((u64)end[5]) << 40; fallthrough;
case 5: b |= ((u64)end[4]) << 32; fallthrough;
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 4: b |= le32_to_cpup(data); break;
case 3: b |= ((u64)end[2]) << 16; fallthrough;
case 3: b |= ((u64)end[2]) << 16; /* fall through */
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; fallthrough;
case 6: b |= ((u64)end[5]) << 40; fallthrough;
case 5: b |= ((u64)end[4]) << 32; fallthrough;
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 4: b |= get_unaligned_le32(end); break;
case 3: b |= ((u64)end[2]) << 16; fallthrough;
case 3: b |= ((u64)end[2]) << 16; /* fall through */
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; fallthrough;
case 3: b |= ((u32)end[2]) << 16; /* fall through */
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; fallthrough;
case 3: b |= ((u32)end[2]) << 16; /* fall through */
case 2: b |= get_unaligned_le16(end); break;
case 1: b |= end[0];
}

2
lib/ts_fsm.c
View File

@ -193,7 +193,7 @@ startover:
TOKEN_MISMATCH();
block_idx++;
fallthrough;
/* fall through */
case TS_FSM_ANY:
if (next == NULL)

14
lib/vsprintf.c
View File

@ -1265,7 +1265,7 @@ char *mac_address_string(char *buf, char *end, u8 *addr,
case 'R':
reversed = true;
fallthrough;
/* fall through */
default:
separator = ':';
@ -1682,7 +1682,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
switch (*(++fmt)) {
case 'L':
uc = true;
fallthrough;
/* fall through */
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);
fallthrough;
/* fall through */
case 'B':
return symbol_string(buf, end, ptr, spec, fmt);
case 'R':
@ -2450,7 +2450,7 @@ qualifier:
case 'x':
spec->flags |= SMALL;
fallthrough;
/* fall through */
case 'X':
spec->base = 16;
@ -2468,7 +2468,7 @@ qualifier:
* utility, treat it as any other invalid or
* unsupported format specifier.
*/
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
case 'd':
is_sign = true;
fallthrough;
/* fall through */
case 'u':
break;
case '%':

4
lib/xz/xz_dec_lzma2.c
View File

@ -1043,7 +1043,7 @@ XZ_EXTERN enum xz_ret xz_dec_lzma2_run(struct xz_dec_lzma2 *s,
s->lzma2.sequence = SEQ_LZMA_PREPARE;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
case SEQ_LZMA_RUN:
/*

16
lib/xz/xz_dec_stream.c
View File

@ -583,7 +583,7 @@ static enum xz_ret dec_main(struct xz_dec *s, struct xz_buf *b)
if (ret != XZ_OK)
return ret;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
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;
fallthrough;
/* fall through */
case SEQ_STREAM_FOOTER:
if (!fill_temp(s, b))

10
lib/zstd/bitstream.h
View File

@ -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);
fallthrough;
/* fall through */
case 6: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[5]) << (sizeof(bitD->bitContainer) * 8 - 24);
fallthrough;
/* fall through */
case 5: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[4]) << (sizeof(bitD->bitContainer) * 8 - 32);
fallthrough;
/* fall through */
case 4: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[3]) << 24;
fallthrough;
/* fall through */
case 3: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[2]) << 16;
fallthrough;
/* fall through */
case 2: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[1]) << 8;
default:;
}

2
lib/zstd/compress.c
View File

@ -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 */
}
fallthrough;
/* fall through */
case zcss_flush: {
size_t const toFlush = zcs->outBuffContentSize - zcs->outBuffFlushedSize;

12
lib/zstd/decompress.c
View File

@ -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);
fallthrough;
/* fall through */
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 */
fallthrough;
/* fall through */
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 */
fallthrough;
/* fall through */
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;
}
fallthrough;
/* fall through */
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 */
}
fallthrough;
/* fall through */
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 */
}
}
fallthrough;
/* fall through */
case zdss_flush: {
size_t const toFlushSize = zds->outEnd - zds->outStart;

4
lib/zstd/huf_compress.c
View File

@ -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);
fallthrough;
/* fall through */
case 2: HUF_encodeSymbol(&bitC, ip[n + 1], CTable); HUF_FLUSHBITS_1(&bitC);
fallthrough;
/* fall through */
case 1: HUF_encodeSymbol(&bitC, ip[n + 0], CTable); HUF_FLUSHBITS(&bitC);
case 0:
default:;