linux-kernel - [PATCH] fs/proc/task_mmu: Add display flag for VM

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Date: Thu,  8 Feb 2024 14:18:05 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH] fs/proc/task_mmu: Add display flag for VM_MAYOVERLAY

VM_UFFD_MISSING flag is mutually exclussive with VM_MAYOVERLAY flag as they
both use the same bit position i.e 0x00000200 in the vm_flags. Let's update
show_smap_vma_flags() to display the correct flags depending on CONFIG_MMU.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
This applies on v6.8-rc3

 fs/proc/task_mmu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3f78ebbb795f..1c4eb25cfc17 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -681,7 +681,11 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
 		[ilog2(VM_HUGEPAGE)]	= "hg",
 		[ilog2(VM_NOHUGEPAGE)]	= "nh",
 		[ilog2(VM_MERGEABLE)]	= "mg",
+#ifdef CONFIG_MMU
 		[ilog2(VM_UFFD_MISSING)]= "um",
+#else
+		[ilog2(VM_MAYOVERLAY)]	= "ov",
+#endif /* CONFIG_MMU */
 		[ilog2(VM_UFFD_WP)]	= "uw",
 #ifdef CONFIG_ARM64_MTE
 		[ilog2(VM_MTE)]		= "mt",
-- 
2.25.1