From f71fa4e3bb22f534ee668e7f4bdf64e59c193afd Mon Sep 17 00:00:00 2001 From: Ilya Leoshkevich Date: Mon, 25 Jul 2022 15:41:00 +0200 Subject: [PATCH] linux-user: Do not treat madvise()'s advice as a bitmask Advice is enum, not flags. Doing (advice & MADV_DONTNEED) also matches e.g. MADV_MERGEABLE. Signed-off-by: Ilya Leoshkevich Reviewed-by: Laurent Vivier Message-Id: <20220725134100.128035-1-iii@linux.ibm.com> Fixes: 892a4f6a750a ("linux-user: Add partial support for MADV_DONTNEED") Signed-off-by: Laurent Vivier --- linux-user/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 4e7a6be6ee..edceaca4a8 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -891,7 +891,7 @@ abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice) * anonymous mappings. In this case passthrough is safe, so do it. */ mmap_lock(); - if ((advice & MADV_DONTNEED) && + if (advice == MADV_DONTNEED && can_passthrough_madv_dontneed(start, end)) { ret = get_errno(madvise(g2h_untagged(start), len, MADV_DONTNEED)); } -- 2.49.0