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allocator: Ignore madvise ENOSYS error

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Support kernels built without CONFIG_ADVISE_SYSCALLS on small
embedded devices.
This commit is contained in:
klzgrad 2022-11-12 15:13:24 +08:00
parent eb7afd95ee
commit 97be7f162a
1 changed files with 6 additions and 1 deletions
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7
src/base/allocator/partition_allocator/page_allocator_internals_posix.h
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@ -410,7 +410,12 @@ void DiscardSystemPagesInternal(uintptr_t address, size_t length) {
// performance benefits unclear. // performance benefits unclear.
// //
// Therefore, we just do the simple thing: MADV_DONTNEED. // Therefore, we just do the simple thing: MADV_DONTNEED.
PA_PCHECK(0 == madvise(ptr, length, MADV_DONTNEED)); int ret = madvise(ptr, length, MADV_DONTNEED);
if (ret && errno == ENOSYS) {
// Ignores when the kernel is built without CONFIG_ADVISE_SYSCALLS
return;
}
PA_PCHECK(ret == 0);
#endif // BUILDFLAG(IS_APPLE) #endif // BUILDFLAG(IS_APPLE)
} }