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c7E5M+/NpslPCmYnDjs5qg0/3ihh6XuOGggZQOqrYPC3PnsNs3NxirwOkVPQgO6mXxpuifvJ DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: <6645ee79-c1b2-cb0d-455c-337b41bf4f5b@ozlabs.ru> Date: Tue, 29 Jan 2019 12:39:31 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1548696702-20686-1-git-send-email-arbab@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Aneesh Kumar K.V" , Charles Johns , Paul Mackerras Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 29/01/2019 04:31, Reza Arbab wrote: > In htab_convert_pte_flags(), _PAGE_CACHE_CTL is used to check for the > _PAGE_SAO flag: > > else if ((pteflags & _PAGE_CACHE_CTL) == _PAGE_SAO) > rflags |= (HPTE_R_W | HPTE_R_I | HPTE_R_M); > > But, it isn't defined to include that flag: > > #define _PAGE_CACHE_CTL (_PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT) > > This happens to work, but only because of the flag values: > > #define _PAGE_SAO 0x00010 /* Strong access order */ > #define _PAGE_NON_IDEMPOTENT 0x00020 /* non idempotent memory */ > #define _PAGE_TOLERANT 0x00030 /* tolerant memory, cache inhibited */ > > To prevent any issues if these particulars ever change, add _PAGE_SAO to > the mask. This does not feel right, doing #define _PAGE_CACHE_CTL 0x30 would make more sense as SAO/NI/TOLERANT is enum so applying "|" to them just seems wrong. > > Suggested-by: Charles Johns > Signed-off-by: Reza Arbab > --- > arch/powerpc/include/asm/book3s/64/pgtable.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h > index 2e6ada2..1d97a28 100644 > --- a/arch/powerpc/include/asm/book3s/64/pgtable.h > +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h > @@ -811,7 +811,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, > return hash__set_pte_at(mm, addr, ptep, pte, percpu); > } > > -#define _PAGE_CACHE_CTL (_PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT) > +#define _PAGE_CACHE_CTL (_PAGE_SAO | _PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT) > > #define pgprot_noncached pgprot_noncached > static inline pgprot_t pgprot_noncached(pgprot_t prot) > -- Alexey