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base/allocator: Fix recommitted pages not being zeroed when madvise is not available.

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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 81678a8f19
commit 1e83ca4c55
2 changed files with 5 additions and 0 deletions
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2
src/base/allocator/partition_allocator/src/partition_alloc/page_allocator.h
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@ -261,6 +261,8 @@ constexpr PA_COMPONENT_EXPORT(
PARTITION_ALLOC) bool DecommittedMemoryIsAlwaysZeroed() { PARTITION_ALLOC) bool DecommittedMemoryIsAlwaysZeroed() {
#if BUILDFLAG(IS_APPLE) #if BUILDFLAG(IS_APPLE)
return false; return false;
#elif defined(NO_MADVISE_SYSCALL)
return false;
#else #else
return true; return true;
#endif #endif

3
src/base/allocator/partition_allocator/src/partition_alloc/page_allocator_internals_posix.h
View File

@ -418,6 +418,9 @@ void DiscardSystemPagesInternal(uintptr_t address, size_t length) {
ret = madvise(ptr, length, MADV_DONTNEED); ret = madvise(ptr, length, MADV_DONTNEED);
} }
PA_PCHECK(ret == 0); PA_PCHECK(ret == 0);
#elif defined(NO_MADVISE_SYSCALL)
static_cast<void>(ptr);
static_cast<void>(length);
#else // BUILDFLAG(IS_APPLE) #else // BUILDFLAG(IS_APPLE)
// We have experimented with other flags, but with suboptimal results. // We have experimented with other flags, but with suboptimal results.
// //