diff mbox series

[v1,13/13] tools headers: Rename noinline to __noinline

Message ID 20240310020509.647319-14-irogers@google.com (mailing list archive)
State Not Applicable
Headers show
Series tools header compiler.h update | expand

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Context Check Description
netdev/tree_selection success Not a local patch, async
bpf/vmtest-bpf-PR fail merge-conflict
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Commit Message

Ian Rogers March 10, 2024, 2:05 a.m. UTC 
An issue was reported with clang and llvm libc where the noinline
attribute [1] was being expanded due to the #define in
linux/compiler.h (now in compiler_attributes.h). The expansion caused
the __attribute__ to appear twice and break the build. To avoid this
conflict, rename noinline to __noinline which is more consistent with
other compiler attributes.

[1] https://clang.llvm.org/docs/AttributeReference.html#noinline
Reported-by: Christopher Di Bella <cjdb@google.com>

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/include/linux/compiler_attributes.h |  4 ++--
 tools/perf/arch/x86/tests/bp-modify.c     |  4 ++--
 tools/perf/bench/find-bit-bench.c         |  2 +-
 tools/perf/tests/bp_account.c             |  2 +-
 tools/perf/tests/bp_signal.c              |  2 +-
 tools/perf/tests/bp_signal_overflow.c     |  2 +-
 tools/perf/tests/dwarf-unwind.c           | 12 ++++++------
 tools/perf/tests/workloads/leafloop.c     |  8 ++++----
 tools/perf/tests/workloads/thloop.c       |  4 ++--
 9 files changed, 20 insertions(+), 20 deletions(-)

Comments

Miguel Ojeda March 10, 2024, 11:24 a.m. UTC | #1 
On Sun, Mar 10, 2024 at 3:06 AM Ian Rogers <irogers@google.com> wrote:
>
> [1] https://clang.llvm.org/docs/AttributeReference.html#noinline
> Reported-by: Christopher Di Bella <cjdb@google.com>

Out of curiosity, was this due to the `[[gnu::noinline]]` or similar
in e.g. `src/string/memset_explicit.h`?

> -#define   noinline                      __attribute__((__noinline__))
> +#define   __noinline                      __attribute__((__noinline__))

I guess it does not matter since I don't see it used in `tools/`, but
should the one inside `__fix_address` be updated too? Or is the idea
to keep the diff as minimal as possible?

Cheers,
Miguel
Nick Desaulniers March 11, 2024, 3:33 p.m. UTC | #2 
On Sun, Mar 10, 2024 at 4:25 AM Miguel Ojeda
<miguel.ojeda.sandonis@gmail.com> wrote:
>
> On Sun, Mar 10, 2024 at 3:06 AM Ian Rogers <irogers@google.com> wrote:
> >
> > [1] https://clang.llvm.org/docs/AttributeReference.html#noinline
> > Reported-by: Christopher Di Bella <cjdb@google.com>
>
> Out of curiosity, was this due to the `[[gnu::noinline]]` or similar
> in e.g. `src/string/memset_explicit.h`?

Yes, and in src/__support/threads/linux/thread.cpp's definition of
start_thread().

Thanks for the patch!

Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Michael S. Tsirkin March 11, 2024, 3:43 p.m. UTC | #3 
On Sat, Mar 09, 2024 at 06:05:08PM -0800, Ian Rogers wrote:
> An issue was reported with clang and llvm libc where the noinline
> attribute [1] was being expanded due to the #define in
> linux/compiler.h (now in compiler_attributes.h). The expansion caused
> the __attribute__ to appear twice and break the build. To avoid this
> conflict, rename noinline to __noinline which is more consistent with
> other compiler attributes.
> 
> [1] https://clang.llvm.org/docs/AttributeReference.html#noinline

Following this link, I don't see __noinline there - only __noinline__ and
noinline. What's up?


Als, pls add an empty line before tags.

> Reported-by: Christopher Di Bella <cjdb@google.com>
> 
> Signed-off-by: Ian Rogers <irogers@google.com>


tags should not have empty lines between them.

> ---
>  tools/include/linux/compiler_attributes.h |  4 ++--
>  tools/perf/arch/x86/tests/bp-modify.c     |  4 ++--
>  tools/perf/bench/find-bit-bench.c         |  2 +-
>  tools/perf/tests/bp_account.c             |  2 +-
>  tools/perf/tests/bp_signal.c              |  2 +-
>  tools/perf/tests/bp_signal_overflow.c     |  2 +-
>  tools/perf/tests/dwarf-unwind.c           | 12 ++++++------
>  tools/perf/tests/workloads/leafloop.c     |  8 ++++----
>  tools/perf/tests/workloads/thloop.c       |  4 ++--
>  9 files changed, 20 insertions(+), 20 deletions(-)
> 
> diff --git a/tools/include/linux/compiler_attributes.h b/tools/include/linux/compiler_attributes.h
> index 9bfaec783e48..1ff3d85f5af3 100644
> --- a/tools/include/linux/compiler_attributes.h
> +++ b/tools/include/linux/compiler_attributes.h
> @@ -267,12 +267,12 @@
>  # define __flatten			__attribute__((flatten))
>  
>  /*
> - * Note the missing underscores.
> + * Note, the kernel version is missing the underscores.
>   *
>   *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-noinline-function-attribute
>   * clang: mentioned
>   */
> -#define   noinline                      __attribute__((__noinline__))
> +#define   __noinline                      __attribute__((__noinline__))
>  
>  /*
>   * Optional: only supported since gcc >= 8
> diff --git a/tools/perf/arch/x86/tests/bp-modify.c b/tools/perf/arch/x86/tests/bp-modify.c
> index 0924ccd9e36d..65493ff7a76f 100644
> --- a/tools/perf/arch/x86/tests/bp-modify.c
> +++ b/tools/perf/arch/x86/tests/bp-modify.c
> @@ -15,13 +15,13 @@
>  #include "tests/tests.h"
>  #include "arch-tests.h"
>  
> -static noinline int bp_1(void)
> +static __noinline int bp_1(void)
>  {
>  	pr_debug("in %s\n", __func__);
>  	return 0;
>  }
>  
> -static noinline int bp_2(void)
> +static __noinline int bp_2(void)
>  {
>  	pr_debug("in %s\n", __func__);
>  	return 0;
> diff --git a/tools/perf/bench/find-bit-bench.c b/tools/perf/bench/find-bit-bench.c
> index 7e25b0e413f6..dd97a51649bc 100644
> --- a/tools/perf/bench/find-bit-bench.c
> +++ b/tools/perf/bench/find-bit-bench.c
> @@ -31,7 +31,7 @@ static const char *const bench_usage[] = {
>  static unsigned int accumulator;
>  static unsigned int use_of_val;
>  
> -static noinline void workload(int val)
> +static __noinline void workload(int val)
>  {
>  	use_of_val += val;
>  	accumulator++;
> diff --git a/tools/perf/tests/bp_account.c b/tools/perf/tests/bp_account.c
> index 6f921db33cf9..459f61752a71 100644
> --- a/tools/perf/tests/bp_account.c
> +++ b/tools/perf/tests/bp_account.c
> @@ -34,7 +34,7 @@
>  
>  static volatile long the_var;
>  
> -static noinline int test_function(void)
> +static __noinline int test_function(void)
>  {
>  	return 0;
>  }
> diff --git a/tools/perf/tests/bp_signal.c b/tools/perf/tests/bp_signal.c
> index 1f2908f02389..484a7e7f96ee 100644
> --- a/tools/perf/tests/bp_signal.c
> +++ b/tools/perf/tests/bp_signal.c
> @@ -59,7 +59,7 @@ static void __test_function(volatile long *ptr)
>  }
>  #endif
>  
> -static noinline int test_function(void)
> +static __noinline int test_function(void)
>  {
>  	__test_function(&the_var);
>  	the_var++;
> diff --git a/tools/perf/tests/bp_signal_overflow.c b/tools/perf/tests/bp_signal_overflow.c
> index 4e897c2cf26b..9436bf2973f8 100644
> --- a/tools/perf/tests/bp_signal_overflow.c
> +++ b/tools/perf/tests/bp_signal_overflow.c
> @@ -30,7 +30,7 @@
>  
>  static int overflows;
>  
> -static noinline int test_function(void)
> +static __noinline int test_function(void)
>  {
>  	return time(NULL);
>  }
> diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
> index d01aa931fe81..a669c69a9242 100644
> --- a/tools/perf/tests/dwarf-unwind.c
> +++ b/tools/perf/tests/dwarf-unwind.c
> @@ -109,7 +109,7 @@ static int unwind_entry(struct unwind_entry *entry, void *arg)
>  	return strcmp((const char *) symbol, funcs[idx]);
>  }
>  
> -NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__thread(struct thread *thread)
> +NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__thread(struct thread *thread)
>  {
>  	struct perf_sample sample;
>  	unsigned long cnt = 0;
> @@ -140,7 +140,7 @@ NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__thread(struct thread *thr
>  
>  static int global_unwind_retval = -INT_MAX;
>  
> -NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__compare(void *p1, void *p2)
> +NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__compare(void *p1, void *p2)
>  {
>  	/* Any possible value should be 'thread' */
>  	struct thread *thread = *(struct thread **)p1;
> @@ -159,7 +159,7 @@ NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__compare(void *p1, void *p
>  	return p1 - p2;
>  }
>  
> -NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_3(struct thread *thread)
> +NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__krava_3(struct thread *thread)
>  {
>  	struct thread *array[2] = {thread, thread};
>  	void *fp = &bsearch;
> @@ -178,7 +178,7 @@ NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_3(struct thread *th
>  	return global_unwind_retval;
>  }
>  
> -NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_2(struct thread *thread)
> +NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__krava_2(struct thread *thread)
>  {
>  	int ret;
>  
> @@ -187,7 +187,7 @@ NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_2(struct thread *th
>  	return ret;
>  }
>  
> -NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_1(struct thread *thread)
> +NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__krava_1(struct thread *thread)
>  {
>  	int ret;
>  
> @@ -196,7 +196,7 @@ NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_1(struct thread *th
>  	return ret;
>  }
>  
> -noinline int test__dwarf_unwind(struct test_suite *test __maybe_unused,
> +__noinline int test__dwarf_unwind(struct test_suite *test __maybe_unused,
>  				int subtest __maybe_unused)
>  {
>  	struct machine *machine;
> diff --git a/tools/perf/tests/workloads/leafloop.c b/tools/perf/tests/workloads/leafloop.c
> index 1bf5cc97649b..89d2cec2f461 100644
> --- a/tools/perf/tests/workloads/leafloop.c
> +++ b/tools/perf/tests/workloads/leafloop.c
> @@ -4,18 +4,18 @@
>  #include "../tests.h"
>  
>  /* We want to check these symbols in perf script */
> -noinline void leaf(volatile int b);
> -noinline void parent(volatile int b);
> +__noinline void leaf(volatile int b);
> +__noinline void parent(volatile int b);
>  
>  static volatile int a;
>  
> -noinline void leaf(volatile int b)
> +__noinline void leaf(volatile int b)
>  {
>  	for (;;)
>  		a += b;
>  }
>  
> -noinline void parent(volatile int b)
> +__noinline void parent(volatile int b)
>  {
>  	leaf(b);
>  }
> diff --git a/tools/perf/tests/workloads/thloop.c b/tools/perf/tests/workloads/thloop.c
> index 457b29f91c3e..e252efb76203 100644
> --- a/tools/perf/tests/workloads/thloop.c
> +++ b/tools/perf/tests/workloads/thloop.c
> @@ -9,14 +9,14 @@
>  static volatile sig_atomic_t done;
>  
>  /* We want to check this symbol in perf report */
> -noinline void test_loop(void);
> +__noinline void test_loop(void);
>  
>  static void sighandler(int sig __maybe_unused)
>  {
>  	done = 1;
>  }
>  
> -noinline void test_loop(void)
> +__noinline void test_loop(void)
>  {
>  	while (!done);
>  }
> -- 
> 2.44.0.278.ge034bb2e1d-goog
Nick Desaulniers March 11, 2024, 4:21 p.m. UTC | #4 
On Mon, Mar 11, 2024 at 8:44 AM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Sat, Mar 09, 2024 at 06:05:08PM -0800, Ian Rogers wrote:
> > An issue was reported with clang and llvm libc where the noinline
> > attribute [1] was being expanded due to the #define in
> > linux/compiler.h (now in compiler_attributes.h). The expansion caused
> > the __attribute__ to appear twice and break the build. To avoid this
> > conflict, rename noinline to __noinline which is more consistent with
> > other compiler attributes.
> >
> > [1] https://clang.llvm.org/docs/AttributeReference.html#noinline
>
> Following this link, I don't see __noinline there - only __noinline__ and
> noinline. What's up?

__noinline (which is what this patch is changing the preprocessor
define to) will not be expanded in the presence of
__attribute__((__noinline__)), __attribute__((noinline)), or
[[gnu::inline]], unlike the previous macro definition.
diff mbox series

Patch

diff --git a/tools/include/linux/compiler_attributes.h b/tools/include/linux/compiler_attributes.h
index 9bfaec783e48..1ff3d85f5af3 100644
--- a/tools/include/linux/compiler_attributes.h
+++ b/tools/include/linux/compiler_attributes.h
@@ -267,12 +267,12 @@ 
 # define __flatten			__attribute__((flatten))
 
 /*
- * Note the missing underscores.
+ * Note, the kernel version is missing the underscores.
  *
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-noinline-function-attribute
  * clang: mentioned
  */
-#define   noinline                      __attribute__((__noinline__))
+#define   __noinline                      __attribute__((__noinline__))
 
 /*
  * Optional: only supported since gcc >= 8
diff --git a/tools/perf/arch/x86/tests/bp-modify.c b/tools/perf/arch/x86/tests/bp-modify.c
index 0924ccd9e36d..65493ff7a76f 100644
--- a/tools/perf/arch/x86/tests/bp-modify.c
+++ b/tools/perf/arch/x86/tests/bp-modify.c
@@ -15,13 +15,13 @@ 
 #include "tests/tests.h"
 #include "arch-tests.h"
 
-static noinline int bp_1(void)
+static __noinline int bp_1(void)
 {
 	pr_debug("in %s\n", __func__);
 	return 0;
 }
 
-static noinline int bp_2(void)
+static __noinline int bp_2(void)
 {
 	pr_debug("in %s\n", __func__);
 	return 0;
diff --git a/tools/perf/bench/find-bit-bench.c b/tools/perf/bench/find-bit-bench.c
index 7e25b0e413f6..dd97a51649bc 100644
--- a/tools/perf/bench/find-bit-bench.c
+++ b/tools/perf/bench/find-bit-bench.c
@@ -31,7 +31,7 @@  static const char *const bench_usage[] = {
 static unsigned int accumulator;
 static unsigned int use_of_val;
 
-static noinline void workload(int val)
+static __noinline void workload(int val)
 {
 	use_of_val += val;
 	accumulator++;
diff --git a/tools/perf/tests/bp_account.c b/tools/perf/tests/bp_account.c
index 6f921db33cf9..459f61752a71 100644
--- a/tools/perf/tests/bp_account.c
+++ b/tools/perf/tests/bp_account.c
@@ -34,7 +34,7 @@ 
 
 static volatile long the_var;
 
-static noinline int test_function(void)
+static __noinline int test_function(void)
 {
 	return 0;
 }
diff --git a/tools/perf/tests/bp_signal.c b/tools/perf/tests/bp_signal.c
index 1f2908f02389..484a7e7f96ee 100644
--- a/tools/perf/tests/bp_signal.c
+++ b/tools/perf/tests/bp_signal.c
@@ -59,7 +59,7 @@  static void __test_function(volatile long *ptr)
 }
 #endif
 
-static noinline int test_function(void)
+static __noinline int test_function(void)
 {
 	__test_function(&the_var);
 	the_var++;
diff --git a/tools/perf/tests/bp_signal_overflow.c b/tools/perf/tests/bp_signal_overflow.c
index 4e897c2cf26b..9436bf2973f8 100644
--- a/tools/perf/tests/bp_signal_overflow.c
+++ b/tools/perf/tests/bp_signal_overflow.c
@@ -30,7 +30,7 @@ 
 
 static int overflows;
 
-static noinline int test_function(void)
+static __noinline int test_function(void)
 {
 	return time(NULL);
 }
diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
index d01aa931fe81..a669c69a9242 100644
--- a/tools/perf/tests/dwarf-unwind.c
+++ b/tools/perf/tests/dwarf-unwind.c
@@ -109,7 +109,7 @@  static int unwind_entry(struct unwind_entry *entry, void *arg)
 	return strcmp((const char *) symbol, funcs[idx]);
 }
 
-NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__thread(struct thread *thread)
+NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__thread(struct thread *thread)
 {
 	struct perf_sample sample;
 	unsigned long cnt = 0;
@@ -140,7 +140,7 @@  NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__thread(struct thread *thr
 
 static int global_unwind_retval = -INT_MAX;
 
-NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__compare(void *p1, void *p2)
+NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__compare(void *p1, void *p2)
 {
 	/* Any possible value should be 'thread' */
 	struct thread *thread = *(struct thread **)p1;
@@ -159,7 +159,7 @@  NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__compare(void *p1, void *p
 	return p1 - p2;
 }
 
-NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_3(struct thread *thread)
+NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__krava_3(struct thread *thread)
 {
 	struct thread *array[2] = {thread, thread};
 	void *fp = &bsearch;
@@ -178,7 +178,7 @@  NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_3(struct thread *th
 	return global_unwind_retval;
 }
 
-NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_2(struct thread *thread)
+NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__krava_2(struct thread *thread)
 {
 	int ret;
 
@@ -187,7 +187,7 @@  NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_2(struct thread *th
 	return ret;
 }
 
-NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_1(struct thread *thread)
+NO_TAIL_CALL_ATTRIBUTE __noinline int test_dwarf_unwind__krava_1(struct thread *thread)
 {
 	int ret;
 
@@ -196,7 +196,7 @@  NO_TAIL_CALL_ATTRIBUTE noinline int test_dwarf_unwind__krava_1(struct thread *th
 	return ret;
 }
 
-noinline int test__dwarf_unwind(struct test_suite *test __maybe_unused,
+__noinline int test__dwarf_unwind(struct test_suite *test __maybe_unused,
 				int subtest __maybe_unused)
 {
 	struct machine *machine;
diff --git a/tools/perf/tests/workloads/leafloop.c b/tools/perf/tests/workloads/leafloop.c
index 1bf5cc97649b..89d2cec2f461 100644
--- a/tools/perf/tests/workloads/leafloop.c
+++ b/tools/perf/tests/workloads/leafloop.c
@@ -4,18 +4,18 @@ 
 #include "../tests.h"
 
 /* We want to check these symbols in perf script */
-noinline void leaf(volatile int b);
-noinline void parent(volatile int b);
+__noinline void leaf(volatile int b);
+__noinline void parent(volatile int b);
 
 static volatile int a;
 
-noinline void leaf(volatile int b)
+__noinline void leaf(volatile int b)
 {
 	for (;;)
 		a += b;
 }
 
-noinline void parent(volatile int b)
+__noinline void parent(volatile int b)
 {
 	leaf(b);
 }
diff --git a/tools/perf/tests/workloads/thloop.c b/tools/perf/tests/workloads/thloop.c
index 457b29f91c3e..e252efb76203 100644
--- a/tools/perf/tests/workloads/thloop.c
+++ b/tools/perf/tests/workloads/thloop.c
@@ -9,14 +9,14 @@ 
 static volatile sig_atomic_t done;
 
 /* We want to check this symbol in perf report */
-noinline void test_loop(void);
+__noinline void test_loop(void);
 
 static void sighandler(int sig __maybe_unused)
 {
 	done = 1;
 }
 
-noinline void test_loop(void)
+__noinline void test_loop(void)
 {
 	while (!done);
 }