[PATCH] tools: Rename __fallthrough to fallthrough

Liam Howlett
2022-11-25T15:50:54Z

Rename the fallthrough attribute to better align with the kernel
version. Copy the definition from include/linux/compiler_attributes.h
including the #else clause. Adding the #else clause allows the tools
compiler.h header to drop the check for a definition entirely and keeps
both definitions together.

Change any __fallthrough statements to fallthrough anywhere it was used
within perf.

This allows other tools to use the same key word as the kernel.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Tom Rix <trix@redhat.com>
Signed-off-by: Liam Howlett <Liam.Howlett@oracle.com>
---
tools/include/linux/compiler-gcc.h | 6 ++++--
tools/include/linux/compiler.h | 4 ----
tools/perf/builtin-probe.c | 2 +-
tools/perf/builtin-stat.c | 2 +-
tools/perf/builtin-top.c | 2 +-
tools/perf/util/callchain.c | 4 ++--
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 6 +++---
tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c | 2 +-
tools/perf/util/ordered-events.c | 2 +-
tools/perf/util/strfilter.c | 2 +-
tools/perf/util/string.c | 2 +-
11 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
index 8816f06fc6c7..62e7c901ac28 100644
--- a/tools/include/linux/compiler-gcc.h
+++ b/tools/include/linux/compiler-gcc.h
@@ -12,8 +12,10 @@
+ __GNUC_PATCHLEVEL__)
#endif

-#if GCC_VERSION >= 70000 && !defined(__CHECKER__)
-# define __fallthrough __attribute__ ((fallthrough))
+#if __has_attribute(__fallthrough__)
+# define fallthrough __attribute__((__fallthrough__))
+#else
+# define fallthrough do {} while (0) /* fallthrough */
#endif

#if __has_attribute(__error__)
diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index 90ba44a99199..9d36c8ce1fe7 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -186,10 +186,6 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
})

-#ifndef __fallthrough
-# define __fallthrough
-#endif
-
/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
#define ___PASTE(a, b) a##b
#define __PASTE(a, b) ___PASTE(a, b)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index f62298f5db3b..8539843d1909 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -706,7 +706,7 @@ __cmd_probe(int argc, const char **argv)
pr_err(" Error: --bootconfig doesn't support uprobes.\n");
return -EINVAL;
}
- __fallthrough;
+ fallthrough;
case 'a':

/* Ensure the last given target is used */
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 265b05157972..19b0278d496c 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -616,7 +616,7 @@ static void process_evlist(struct evlist *evlist, unsigned int interval)
if (evlist__ctlfd_process(evlist, &cmd) > 0) {
switch (cmd) {
case EVLIST_CTL_CMD_ENABLE:
- __fallthrough;
+ fallthrough;
case EVLIST_CTL_CMD_DISABLE:
if (interval)
process_interval();
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 4b3ff7687236..cfe1cde35528 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -707,7 +707,7 @@ static void *display_thread(void *arg)
case -1:
if (errno == EINTR)
continue;
- __fallthrough;
+ fallthrough;
default:
c = getc(stdin);
tcsetattr(0, TCSAFLUSH, &save);
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index a093a15f048f..588f86a84eaa 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -724,7 +724,7 @@ static enum match_result match_chain(struct callchain_cursor_node *node,
if (match != MATCH_ERROR)
break;
/* otherwise fall-back to symbol-based comparison below */
- __fallthrough;
+ fallthrough;
case CCKEY_FUNCTION:
if (node->ms.sym && cnode->ms.sym) {
/*
@@ -745,7 +745,7 @@ static enum match_result match_chain(struct callchain_cursor_node *node,
}
}
/* otherwise fall-back to IP-based comparison below */
- __fallthrough;
+ fallthrough;
case CCKEY_ADDRESS:
default:
match = match_chain_dso_addresses(cnode->ms.map, cnode->ip, node->ms.map, node->ip);
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 0ac860c8dd2b..57dea8074777 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -3544,7 +3544,7 @@ static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
switch (decoder->packet.type) {
case INTEL_PT_TIP_PGD:
decoder->continuous_period = false;
- __fallthrough;
+ fallthrough;
case INTEL_PT_TIP_PGE:
case INTEL_PT_TIP:
case INTEL_PT_PTWRITE:
@@ -3614,7 +3614,7 @@ static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
decoder->pge = false;
decoder->continuous_period = false;
intel_pt_clear_tx_flags(decoder);
- __fallthrough;
+ fallthrough;

case INTEL_PT_TNT:
decoder->have_tma = false;
@@ -3978,7 +3978,7 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
decoder->have_last_ip = false;
decoder->last_ip = 0;
decoder->ip = 0;
- __fallthrough;
+ fallthrough;
case INTEL_PT_STATE_ERR_RESYNC:
err = intel_pt_sync_ip(decoder);
break;
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c
index 18f97f43e01a..af9710622a1f 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c
@@ -730,7 +730,7 @@ int intel_pt_pkt_desc(const struct intel_pt_pkt *packet, char *buf,
case INTEL_PT_FUP:
if (!(packet->count))
return snprintf(buf, buf_len, "%s no ip", name);
- __fallthrough;
+ fallthrough;
case INTEL_PT_CYC:
case INTEL_PT_VMCS:
case INTEL_PT_MTC:
diff --git a/tools/perf/util/ordered-events.c b/tools/perf/util/ordered-events.c
index b887dfeea673..8c62611f10aa 100644
--- a/tools/perf/util/ordered-events.c
+++ b/tools/perf/util/ordered-events.c
@@ -284,7 +284,7 @@ static int __ordered_events__flush(struct ordered_events *oe, enum oe_flush how,
switch (how) {
case OE_FLUSH__FINAL:
show_progress = true;
- __fallthrough;
+ fallthrough;
case OE_FLUSH__TOP:
oe->next_flush = ULLONG_MAX;
break;
diff --git a/tools/perf/util/strfilter.c b/tools/perf/util/strfilter.c
index 78aa4c3b990d..02807b9d4122 100644
--- a/tools/perf/util/strfilter.c
+++ b/tools/perf/util/strfilter.c
@@ -274,7 +274,7 @@ static int strfilter_node__sprint(struct strfilter_node *node, char *buf)
len = strfilter_node__sprint_pt(node->l, buf);
if (len < 0)
return len;
- __fallthrough;
+ fallthrough;
case '!':
if (buf) {
*(buf + len++) = *node->p;
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
index 4f12a96f33cc..cf05b0b56c57 100644
--- a/tools/perf/util/string.c
+++ b/tools/perf/util/string.c
@@ -35,7 +35,7 @@ s64 perf_atoll(const char *str)
if (*p)
goto out_err;

- __fallthrough;
+ fallthrough;
case '\0':
return length;
default:
--
2.35.1