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47 lines
1.7 KiB
Diff
47 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Sat, 19 Nov 2016 09:56:14 -0500
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Subject: [PATCH] stop implicitly marking mappings as mergeable
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---
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libc/bionic/mmap.cpp | 19 +------------------
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1 file changed, 1 insertion(+), 18 deletions(-)
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diff --git a/libc/bionic/mmap.cpp b/libc/bionic/mmap.cpp
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index 35033199a..c08106892 100644
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--- a/libc/bionic/mmap.cpp
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+++ b/libc/bionic/mmap.cpp
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@@ -39,8 +39,6 @@ extern "C" void* __mmap2(void*, size_t, int, int, int, size_t);
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#define MMAP2_SHIFT 12 // 2**12 == 4096
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-static bool kernel_has_MADV_MERGEABLE = true;
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-
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void* mmap64(void* addr, size_t size, int prot, int flags, int fd, off64_t offset) {
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if (offset < 0 || (offset & ((1UL << MMAP2_SHIFT)-1)) != 0) {
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errno = EINVAL;
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@@ -54,22 +52,7 @@ void* mmap64(void* addr, size_t size, int prot, int flags, int fd, off64_t offse
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return MAP_FAILED;
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}
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- bool is_private_anonymous =
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- (flags & (MAP_PRIVATE | MAP_ANONYMOUS)) == (MAP_PRIVATE | MAP_ANONYMOUS);
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- bool is_stack_or_grows_down = (flags & (MAP_STACK | MAP_GROWSDOWN)) != 0;
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-
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- void* result = __mmap2(addr, size, prot, flags, fd, offset >> MMAP2_SHIFT);
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-
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- if (result != MAP_FAILED && kernel_has_MADV_MERGEABLE &&
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- is_private_anonymous && !is_stack_or_grows_down) {
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- ErrnoRestorer errno_restorer;
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- int rc = madvise(result, size, MADV_MERGEABLE);
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- if (rc == -1 && errno == EINVAL) {
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- kernel_has_MADV_MERGEABLE = false;
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- }
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- }
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-
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- return result;
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+ return __mmap2(addr, size, prot, flags, fd, offset >> MMAP2_SHIFT);
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}
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void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset) {
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