[PATCH] madvise: Avoid returning error code -EBADF for anonymous mappings (1bef4003) · Commits · e / devices / android_kernel_xiaomi_nabu

Revert this recent correctness change: Douglas Crosher <dcrosher@scieneer.com> reported that it broke an existing application, and that madvise() works without error on anonymous mappings on Solaris. This means that madvise() will remain non-standards-compliant: we should return -EBADF for all requests against non-file-backed vma's, but Linux only does this for MADV_WILLNEED requests. Signed-off-by:

Suzuki K P <suzuki@in.ibm.com> Signed-off-by:

Andrew Morton <akpm@osdl.org> Signed-off-by:

Linus Torvalds <torvalds@osdl.org>

mm/madvise.c

+4 −7

Original line number	Diff line number	Diff line
		@@ -83,6 +83,9 @@ static long madvise_willneed(struct vm_area_struct * vma,
		{
		struct file *file = vma->vm_file;

		if (!file)
		return -EBADF;

		if (file->f_mapping->a_ops->get_xip_page) {
		/* no bad return value, but ignore advice */
		return 0;
		@@ -141,11 +144,7 @@ static long
		madvise_vma(struct vm_area_struct vma, struct vm_area_struct *prev,
		unsigned long start, unsigned long end, int behavior)
		{
		struct file *filp = vma->vm_file;
		long error = -EBADF;

		if (!filp)
		goto out;
		long error;

		switch (behavior) {
		case MADV_NORMAL:
		@@ -166,8 +165,6 @@ madvise_vma(struct vm_area_struct vma, struct vm_area_struct *prev,
		error = -EINVAL;
		break;
		}

		out:
		return error;
		}