linux-kernel - [PATCH 5.0 019/139] mm/gup: Remove the write parameter from gup_fast

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Date:   Thu, 23 May 2019 21:05:07 +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, Ira Weiny <ira.weiny@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>, linux-mm@...ck.org,
        Ingo Molnar <mingo@...nel.org>,
        Justin Forbes <jmforbes@...uxtx.org>
Subject: [PATCH 5.0 019/139] mm/gup: Remove the write parameter from gup_fast_permitted()

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

commit ad8cfb9c42ef83ecf4079bc7d77e6557648e952b upstream.

The 'write' parameter is unused in gup_fast_permitted() so remove it.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/20190210223424.13934-1-ira.weiny@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Justin Forbes <jmforbes@...uxtx.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/include/asm/pgtable_64.h |    3 +--
 mm/gup.c                          |    6 +++---
 2 files changed, 4 insertions(+), 5 deletions(-)

--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -259,8 +259,7 @@ extern void init_extra_mapping_uc(unsign
 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
 
 #define gup_fast_permitted gup_fast_permitted
-static inline bool gup_fast_permitted(unsigned long start, int nr_pages,
-		int write)
+static inline bool gup_fast_permitted(unsigned long start, int nr_pages)
 {
 	unsigned long len, end;
 
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1811,7 +1811,7 @@ static void gup_pgd_range(unsigned long
  * Check if it's allowed to use __get_user_pages_fast() for the range, or
  * we need to fall back to the slow version:
  */
-bool gup_fast_permitted(unsigned long start, int nr_pages, int write)
+bool gup_fast_permitted(unsigned long start, int nr_pages)
 {
 	unsigned long len, end;
 
@@ -1853,7 +1853,7 @@ int __get_user_pages_fast(unsigned long
 	 * block IPIs that come from THPs splitting.
 	 */
 
-	if (gup_fast_permitted(start, nr_pages, write)) {
+	if (gup_fast_permitted(start, nr_pages)) {
 		local_irq_save(flags);
 		gup_pgd_range(start, end, write, pages, &nr);
 		local_irq_restore(flags);
@@ -1895,7 +1895,7 @@ int get_user_pages_fast(unsigned long st
 	if (unlikely(!access_ok((void __user *)start, len)))
 		return -EFAULT;
 
-	if (gup_fast_permitted(start, nr_pages, write)) {
+	if (gup_fast_permitted(start, nr_pages)) {
 		local_irq_disable();
 		gup_pgd_range(addr, end, write, pages, &nr);
 		local_irq_enable();