| Message ID | 20240310020509.647319-1-irogers@google.com |
|---|---|
| Headers | show |
| Series | tools header compiler.h update | expand |
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
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
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.