On Wed, Jan 23, 2013 at 07:13:21PM +0900, Takuya Yoshikawa wrote:
> The expression (sp)->gfn should not be expanded using @gfn.
>
> Although no user of these macros passes a string other than gfn now,
> this should be fixed before anyone sees strange errors.
>
> Also, the counter-intuitive conditions, which had been used before these
> macros were introduced to avoid extra indentations, should not be used.
>
Not sure what do you mean here. This counter-intuitive conditions are
used so that if "else" follows the macro it will not be interpreted as
belonging to the hidden if(). Like in the following code:
if (x)
for_each_gfn_sp()
else
do_y();
You do not expect do_y() to be called for each sp->gfn != gfn.
> Note: ignored the following checkpatch report:
> ERROR: Macros with complex values should be enclosed in parenthesis
>
> Signed-off-by: Takuya Yoshikawa <[email protected]>
> ---
> arch/x86/kvm/mmu.c | 18 ++++++++----------
> 1 files changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index 9f628f7..376cec8 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -1658,16 +1658,14 @@ static int kvm_mmu_prepare_zap_page(struct kvm *kvm,
> struct kvm_mmu_page *sp,
> static void kvm_mmu_commit_zap_page(struct kvm *kvm,
> struct list_head *invalid_list);
>
> -#define for_each_gfn_sp(kvm, sp, gfn, pos) \
> - hlist_for_each_entry(sp, pos,
> \
> - &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link)
> \
> - if ((sp)->gfn != (gfn)) {} else
> -
> -#define for_each_gfn_indirect_valid_sp(kvm, sp, gfn, pos) \
> - hlist_for_each_entry(sp, pos,
> \
> - &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link)
> \
> - if ((sp)->gfn != (gfn) || (sp)->role.direct || \
> - (sp)->role.invalid) {} else
> +#define for_each_gfn_sp(_kvm, _sp, _gfn, _pos)
> \
> + hlist_for_each_entry(_sp, _pos, \
> + &(_kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(_gfn)], hash_link) \
> + if ((_sp)->gfn == (_gfn))
> +
> +#define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn, _pos)
> \
> + for_each_gfn_sp(_kvm, _sp, _gfn, _pos) \
> + if (!(_sp)->role.direct && !(_sp)->role.invalid)
>
> /* @sp->gfn should be write-protected at the call site */
> static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
> --
> 1.7.5.4
--
Gleb.
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