From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
PowerPC <linuxppc-dev@lists.ozlabs.org>,
Paul Mackerras <paulus@ozlabs.org>
Cc: Linux-Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: linux-next: build warnings
Date: Tue, 2 May 2017 16:05:30 +1000 [thread overview]
Message-ID: <20170502160530.34b680b7@canb.auug.org.au> (raw)
Hi all,
The linux-next build (powerpc allyesconfig) produced these warnings
(and have for a while):
arch/powerpc/kvm/book3s_pr_papr.c: In function 'kvmppc_h_pr_enter':
arch/powerpc/kvm/book3s_pr_papr.c:53:2: warning: ignoring return value of 'copy_from_user', declared with attribute warn_unused_result [-Wunused-result]
copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg));
^
arch/powerpc/kvm/book3s_pr_papr.c:74:2: warning: ignoring return value of 'copy_to_user', declared with attribute warn_unused_result [-Wunused-result]
copy_to_user((void __user *)pteg_addr, hpte, HPTE_SIZE);
^
arch/powerpc/kvm/book3s_pr_papr.c: In function 'kvmppc_h_pr_remove':
arch/powerpc/kvm/book3s_pr_papr.c:96:2: warning: ignoring return value of 'copy_from_user', declared with attribute warn_unused_result [-Wunused-result]
copy_from_user(pte, (void __user *)pteg, sizeof(pte));
^
arch/powerpc/kvm/book3s_pr_papr.c:106:2: warning: ignoring return value of 'copy_to_user', declared with attribute warn_unused_result [-Wunused-result]
copy_to_user((void __user *)pteg, &v, sizeof(v));
^
arch/powerpc/kvm/book3s_pr_papr.c: In function 'kvmppc_h_pr_protect':
arch/powerpc/kvm/book3s_pr_papr.c:214:2: warning: ignoring return value of 'copy_from_user', declared with attribute warn_unused_result [-Wunused-result]
copy_from_user(pte, (void __user *)pteg, sizeof(pte));
^
arch/powerpc/kvm/book3s_pr_papr.c:237:2: warning: ignoring return value of 'copy_to_user', declared with attribute warn_unused_result [-Wunused-result]
copy_to_user((void __user *)pteg, pte, sizeof(pte));
^
arch/powerpc/kvm/book3s_pr_papr.c: In function 'kvmppc_h_pr_bulk_remove':
arch/powerpc/kvm/book3s_pr_papr.c:174:3: warning: ignoring return value of 'copy_from_user', declared with attribute warn_unused_result [-Wunused-result]
copy_from_user(pte, (void __user *)pteg, sizeof(pte));
^
arch/powerpc/kvm/book3s_pr_papr.c:187:4: warning: ignoring return value of 'copy_to_user', declared with attribute warn_unused_result [-Wunused-result]
copy_to_user((void __user *)pteg, &v, sizeof(v));
^
These calls have been there since about v3.1-rc8. I assume the
copy_to/from_user() work has pointed them out.
--
Cheers,
Stephen Rothwell
next reply other threads:[~2017-05-02 6:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-02 6:05 Stephen Rothwell [this message]
2017-05-02 9:53 ` linux-next: build warnings Michael Ellerman
2017-05-02 11:17 ` Stephen Rothwell
2017-05-02 11:21 ` Stephen Rothwell
2017-05-02 12:46 ` Michael Ellerman
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