FAILED: patch "[PATCH] MIPS: KVM: Fix a build warning about variable set but not" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] MIPS: KVM: Fix a build warning about variable set but not" failed to apply to 5.15-stable tree

[gregkh]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 83767a67e7b6a0291cde5681ec7e3708f3f8f877
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023112431-slapping-pureblood-ab79@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

83767a67e7b6 ("MIPS: KVM: Fix a build warning about variable set but not used")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 83767a67e7b6a0291cde5681ec7e3708f3f8f877 Mon Sep 17 00:00:00 2001
From: Huacai Chen <chenhuacai@kernel.org>
Date: Tue, 10 Oct 2023 16:54:34 +0800
Subject: [PATCH] MIPS: KVM: Fix a build warning about variable set but not
 used
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

After commit 411740f5422a ("KVM: MIPS/MMU: Implement KVM_CAP_SYNC_MMU")
old_pte is no longer used in kvm_mips_map_page(). So remove it to fix a
build warning about variable set but not used:

   arch/mips/kvm/mmu.c: In function 'kvm_mips_map_page':
>> arch/mips/kvm/mmu.c:701:29: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
     701 |         pte_t *ptep, entry, old_pte;
         |                             ^~~~~~~

Cc: stable@vger.kernel.org
Fixes: 411740f5422a960 ("KVM: MIPS/MMU: Implement KVM_CAP_SYNC_MMU")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310070530.aARZCSfh-lkp@intel.com/
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 7b2ac1319d70..467ee6b95ae1 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -592,7 +592,7 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa,
 	gfn_t gfn = gpa >> PAGE_SHIFT;
 	int srcu_idx, err;
 	kvm_pfn_t pfn;
-	pte_t *ptep, entry, old_pte;
+	pte_t *ptep, entry;
 	bool writeable;
 	unsigned long prot_bits;
 	unsigned long mmu_seq;
@@ -664,7 +664,6 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa,
 	entry = pfn_pte(pfn, __pgprot(prot_bits));
 
 	/* Write the PTE */
-	old_pte = *ptep;
 	set_pte(ptep, entry);
 
 	err = 0;