linux-kernel - [RFC PATCH 6/6] pkeys: Change mm_pkey

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Date:   Fri, 10 Jun 2022 16:35:33 -0700
From:   ira.weiny@...el.com
To:     linux-api@...r.kernel.org
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Sohil Mehta <sohil.mehta@...el.com>, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org
Subject: [RFC PATCH 6/6] pkeys: Change mm_pkey_free() to void

From: Ira Weiny <ira.weiny@...el.com>

Now that the pkey arch support is no longer checked in mm_pkey_free()
there is no reason to have it return int.

Change the return value to void.

Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Suggested-by: Sohil Mehta <sohil.mehta@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 arch/powerpc/include/asm/pkeys.h | 4 +---
 arch/x86/include/asm/pkeys.h     | 4 +---
 include/linux/pkeys.h            | 5 +----
 mm/mprotect.c                    | 6 ++++--
 4 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index e96aa91f817b..4d01a48ab941 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -105,11 +105,9 @@ static inline int mm_pkey_alloc(struct mm_struct *mm)
 	return ret;
 }
 
-static inline int mm_pkey_free(struct mm_struct *mm, int pkey)
+static inline void mm_pkey_free(struct mm_struct *mm, int pkey)
 {
 	__mm_pkey_free(mm, pkey);
-
-	return 0;
 }
 
 /*
diff --git a/arch/x86/include/asm/pkeys.h b/arch/x86/include/asm/pkeys.h
index da02737cc4d1..1f408f46fa9a 100644
--- a/arch/x86/include/asm/pkeys.h
+++ b/arch/x86/include/asm/pkeys.h
@@ -105,11 +105,9 @@ int mm_pkey_alloc(struct mm_struct *mm)
 }
 
 static inline
-int mm_pkey_free(struct mm_struct *mm, int pkey)
+void mm_pkey_free(struct mm_struct *mm, int pkey)
 {
 	mm_set_pkey_free(mm, pkey);
-
-	return 0;
 }
 
 static inline int vma_pkey(struct vm_area_struct *vma)
diff --git a/include/linux/pkeys.h b/include/linux/pkeys.h
index 86be8bf27b41..bf98c50a3437 100644
--- a/include/linux/pkeys.h
+++ b/include/linux/pkeys.h
@@ -30,10 +30,7 @@ static inline int mm_pkey_alloc(struct mm_struct *mm)
 	return -1;
 }
 
-static inline int mm_pkey_free(struct mm_struct *mm, int pkey)
-{
-	return -EINVAL;
-}
+static inline void mm_pkey_free(struct mm_struct *mm, int pkey) { }
 
 static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
 			unsigned long init_val)
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 41458e729c27..e872bdd2e228 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -809,8 +809,10 @@ SYSCALL_DEFINE1(pkey_free, int, pkey)
 		return ret;
 
 	mmap_write_lock(current->mm);
-	if (mm_pkey_is_allocated(current->mm, pkey))
-		ret = mm_pkey_free(current->mm, pkey);
+	if (mm_pkey_is_allocated(current->mm, pkey)) {
+		mm_pkey_free(current->mm, pkey);
+		ret = 0;
+	}
 	mmap_write_unlock(current->mm);
 
 	/*
-- 
2.35.1