linux-kernel - linux-next: build warnings

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Date:   Tue, 2 May 2017 16:05:30 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Paul Mackerras <paulus@...abs.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: linux-next: build warnings

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