linux-kernel - [PATCH 5.15 008/201] Revert "selftest/vm: verify remap destination address in mremap

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Date:   Wed, 27 Jul 2022 18:08:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "sidhartha.kumar@...cle.com, stable@...r.kernel.org, Oleksandr
        Tymoshenko" <ovt@...gle.com>, Oleksandr Tymoshenko <ovt@...gle.com>
Subject: [PATCH 5.15 008/201] Revert "selftest/vm: verify remap destination address in mremap_test"

From: Oleksandr Tymoshenko <ovt@...gle.com>

This reverts commit 0b4e16093e081a3ab08b0d6cedf79b249f41b248.

The upstream commit 18d609daa546 ("selftest/vm: verify remap destination
address in mremap_test") was backported as commit 2688d967ec65
("selftest/vm: verify remap destination address in mremap_test").
Repeated backport introduced the duplicate of function
is_remap_region_valid to the file breakign the vm selftest build.

Fixes: 0b4e16093e08 ("selftest/vm: verify remap destination address in mremap_test")
Signed-off-by: Oleksandr Tymoshenko <ovt@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/testing/selftests/vm/mremap_test.c |   24 ------------------------
 1 file changed, 24 deletions(-)

--- a/tools/testing/selftests/vm/mremap_test.c
+++ b/tools/testing/selftests/vm/mremap_test.c
@@ -66,30 +66,6 @@ enum {
 	.expect_failure = should_fail				\
 }
 
-/*
- * Returns false if the requested remap region overlaps with an
- * existing mapping (e.g text, stack) else returns true.
- */
-static bool is_remap_region_valid(void *addr, unsigned long long size)
-{
-	void *remap_addr = NULL;
-	bool ret = true;
-
-	/* Use MAP_FIXED_NOREPLACE flag to ensure region is not mapped */
-	remap_addr = mmap(addr, size, PROT_READ | PROT_WRITE,
-					 MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED,
-					 -1, 0);
-
-	if (remap_addr == MAP_FAILED) {
-		if (errno == EEXIST)
-			ret = false;
-	} else {
-		munmap(remap_addr, size);
-	}
-
-	return ret;
-}
-
 /* Returns mmap_min_addr sysctl tunable from procfs */
 static unsigned long long get_mmap_min_addr(void)
 {