| Message ID | 1436474552-31789-7-git-send-email-julien.grall@citrix.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, 9 Jul 2015, Julien Grall wrote: > All the usage of the field pfn are done using the same idiom: > > pfn_to_page(grant->pfn) > > This will return always the same page. Store directly the page in the > grant to clean up the code. > > Signed-off-by: Julien Grall <julien.grall@citrix.com> > Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> > Cc: Roger Pau Monné <roger.pau@citrix.com> > Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> > Cc: David Vrabel <david.vrabel@citrix.com> > --- > Changes in v2: > - Patch added > --- > drivers/block/xen-blkfront.c | 37 ++++++++++++++++++------------------- > 1 file changed, 18 insertions(+), 19 deletions(-) > > diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c > index 7107d58..7b81d23 100644 > --- a/drivers/block/xen-blkfront.c > +++ b/drivers/block/xen-blkfront.c > @@ -67,7 +67,7 @@ enum blkif_state { > > struct grant { > grant_ref_t gref; > - unsigned long pfn; > + struct page *page; > struct list_head node; > }; > > @@ -219,7 +219,7 @@ static int fill_grant_buffer(struct blkfront_info *info, int num) > kfree(gnt_list_entry); > goto out_of_memory; > } > - gnt_list_entry->pfn = page_to_pfn(granted_page); > + gnt_list_entry->page = granted_page; > } > > gnt_list_entry->gref = GRANT_INVALID_REF; > @@ -234,7 +234,7 @@ out_of_memory: > &info->grants, node) { > list_del(&gnt_list_entry->node); > if (info->feature_persistent) > - __free_page(pfn_to_page(gnt_list_entry->pfn)); > + __free_page(gnt_list_entry->page); > kfree(gnt_list_entry); > i--; > } > @@ -243,7 +243,7 @@ out_of_memory: > } > > static struct grant *get_grant(grant_ref_t *gref_head, > - unsigned long pfn, > + struct page *page, > struct blkfront_info *info) indentation Aside from this: Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> > { > struct grant *gnt_list_entry; > @@ -263,10 +263,10 @@ static struct grant *get_grant(grant_ref_t *gref_head, > gnt_list_entry->gref = gnttab_claim_grant_reference(gref_head); > BUG_ON(gnt_list_entry->gref == -ENOSPC); > if (!info->feature_persistent) { > - BUG_ON(!pfn); > - gnt_list_entry->pfn = pfn; > + BUG_ON(!page); > + gnt_list_entry->page = page; > } > - buffer_mfn = pfn_to_mfn(gnt_list_entry->pfn); > + buffer_mfn = page_to_mfn(gnt_list_entry->page); > gnttab_grant_foreign_access_ref(gnt_list_entry->gref, > info->xbdev->otherend_id, > buffer_mfn, 0); > @@ -522,7 +522,7 @@ static int blkif_queue_rw_req(struct request *req) > > if ((ring_req->operation == BLKIF_OP_INDIRECT) && > (i % SEGS_PER_INDIRECT_FRAME == 0)) { > - unsigned long uninitialized_var(pfn); > + struct page *uninitialized_var(page); > > if (segments) > kunmap_atomic(segments); > @@ -536,15 +536,15 @@ static int blkif_queue_rw_req(struct request *req) > indirect_page = list_first_entry(&info->indirect_pages, > struct page, lru); > list_del(&indirect_page->lru); > - pfn = page_to_pfn(indirect_page); > + page = indirect_page; > } > - gnt_list_entry = get_grant(&gref_head, pfn, info); > + gnt_list_entry = get_grant(&gref_head, page, info); > info->shadow[id].indirect_grants[n] = gnt_list_entry; > - segments = kmap_atomic(pfn_to_page(gnt_list_entry->pfn)); > + segments = kmap_atomic(gnt_list_entry->page); > ring_req->u.indirect.indirect_grefs[n] = gnt_list_entry->gref; > } > > - gnt_list_entry = get_grant(&gref_head, page_to_pfn(sg_page(sg)), info); > + gnt_list_entry = get_grant(&gref_head, sg_page(sg), info); > ref = gnt_list_entry->gref; > > info->shadow[id].grants_used[i] = gnt_list_entry; > @@ -555,7 +555,7 @@ static int blkif_queue_rw_req(struct request *req) > > BUG_ON(sg->offset + sg->length > PAGE_SIZE); > > - shared_data = kmap_atomic(pfn_to_page(gnt_list_entry->pfn)); > + shared_data = kmap_atomic(gnt_list_entry->page); > bvec_data = kmap_atomic(sg_page(sg)); > > /* > @@ -1002,7 +1002,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) > info->persistent_gnts_c--; > } > if (info->feature_persistent) > - __free_page(pfn_to_page(persistent_gnt->pfn)); > + __free_page(persistent_gnt->page); > kfree(persistent_gnt); > } > } > @@ -1037,7 +1037,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) > persistent_gnt = info->shadow[i].grants_used[j]; > gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); > if (info->feature_persistent) > - __free_page(pfn_to_page(persistent_gnt->pfn)); > + __free_page(persistent_gnt->page); > kfree(persistent_gnt); > } > > @@ -1051,7 +1051,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) > for (j = 0; j < INDIRECT_GREFS(segs); j++) { > persistent_gnt = info->shadow[i].indirect_grants[j]; > gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); > - __free_page(pfn_to_page(persistent_gnt->pfn)); > + __free_page(persistent_gnt->page); > kfree(persistent_gnt); > } > > @@ -1102,8 +1102,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info, > if (bret->operation == BLKIF_OP_READ && info->feature_persistent) { > for_each_sg(s->sg, sg, nseg, i) { > BUG_ON(sg->offset + sg->length > PAGE_SIZE); > - shared_data = kmap_atomic( > - pfn_to_page(s->grants_used[i]->pfn)); > + shared_data = kmap_atomic(s->grants_used[i]->page); > bvec_data = kmap_atomic(sg_page(sg)); > memcpy(bvec_data + sg->offset, > shared_data + sg->offset, > @@ -1154,7 +1153,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info, > * Add the used indirect page back to the list of > * available pages for indirect grefs. > */ > - indirect_page = pfn_to_page(s->indirect_grants[i]->pfn); > + indirect_page = s->indirect_grants[i]->page; > list_add(&indirect_page->lru, &info->indirect_pages); > s->indirect_grants[i]->gref = GRANT_INVALID_REF; > list_add_tail(&s->indirect_grants[i]->node, &info->grants); > -- > 2.1.4 >
El 09/07/15 a les 22.42, Julien Grall ha escrit: > All the usage of the field pfn are done using the same idiom: > > pfn_to_page(grant->pfn) > > This will return always the same page. Store directly the page in the > grant to clean up the code. > > Signed-off-by: Julien Grall <julien.grall@citrix.com> > Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> > Cc: Roger Pau Monné <roger.pau@citrix.com> > Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> > Cc: David Vrabel <david.vrabel@citrix.com> Acked-by: Roger Pau Monné <roger.pau@citrix.com> With one style fix. [...] > static struct grant *get_grant(grant_ref_t *gref_head, > - unsigned long pfn, > + struct page *page, Indentation. Roger.
Hi Roger, On 21/07/15 11:16, Roger Pau Monné wrote: > El 09/07/15 a les 22.42, Julien Grall ha escrit: >> All the usage of the field pfn are done using the same idiom: >> >> pfn_to_page(grant->pfn) >> >> This will return always the same page. Store directly the page in the >> grant to clean up the code. >> >> Signed-off-by: Julien Grall <julien.grall@citrix.com> >> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> >> Cc: Roger Pau Monné <roger.pau@citrix.com> >> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> >> Cc: David Vrabel <david.vrabel@citrix.com> > > Acked-by: Roger Pau Monné <roger.pau@citrix.com> > > With one style fix. > > [...] > >> static struct grant *get_grant(grant_ref_t *gref_head, >> - unsigned long pfn, >> + struct page *page, > > Indentation. The indentation for the parameters of this function wasn't correct: static struct grant *get_grant(grant_ref_t *gref_head, - unsigned long pfn, +^I^I^I struct page *page, struct blkfront_info *info) So "struct page *page" is correctly indent but not the remaining parameter ("struct blkfront_info *info"). I will indent it correctly. Regards,
Hi Stefano, On 16/07/15 16:11, Stefano Stabellini wrote: > On Thu, 9 Jul 2015, Julien Grall wrote: >> All the usage of the field pfn are done using the same idiom: >> >> pfn_to_page(grant->pfn) >> >> This will return always the same page. Store directly the page in the >> grant to clean up the code. >> >> Signed-off-by: Julien Grall <julien.grall@citrix.com> >> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> >> Cc: Roger Pau Monné <roger.pau@citrix.com> >> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> >> Cc: David Vrabel <david.vrabel@citrix.com> >> --- >> Changes in v2: >> - Patch added >> --- >> drivers/block/xen-blkfront.c | 37 ++++++++++++++++++------------------- >> 1 file changed, 18 insertions(+), 19 deletions(-) >> >> diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c >> index 7107d58..7b81d23 100644 >> --- a/drivers/block/xen-blkfront.c >> +++ b/drivers/block/xen-blkfront.c >> @@ -67,7 +67,7 @@ enum blkif_state { >> >> struct grant { >> grant_ref_t gref; >> - unsigned long pfn; >> + struct page *page; >> struct list_head node; >> }; >> >> @@ -219,7 +219,7 @@ static int fill_grant_buffer(struct blkfront_info *info, int num) >> kfree(gnt_list_entry); >> goto out_of_memory; >> } >> - gnt_list_entry->pfn = page_to_pfn(granted_page); >> + gnt_list_entry->page = granted_page; >> } >> >> gnt_list_entry->gref = GRANT_INVALID_REF; >> @@ -234,7 +234,7 @@ out_of_memory: >> &info->grants, node) { >> list_del(&gnt_list_entry->node); >> if (info->feature_persistent) >> - __free_page(pfn_to_page(gnt_list_entry->pfn)); >> + __free_page(gnt_list_entry->page); >> kfree(gnt_list_entry); >> i--; >> } >> @@ -243,7 +243,7 @@ out_of_memory: >> } >> >> static struct grant *get_grant(grant_ref_t *gref_head, >> - unsigned long pfn, >> + struct page *page, >> struct blkfront_info *info) > > indentation The indentation of the parameters wasn't valid. I will indent correctly "struct blkfront_info *info" rather than to use invalid indent. > Aside from this: > > Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Thank you, Regards,
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 7107d58..7b81d23 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -67,7 +67,7 @@ enum blkif_state { struct grant { grant_ref_t gref; - unsigned long pfn; + struct page *page; struct list_head node; }; @@ -219,7 +219,7 @@ static int fill_grant_buffer(struct blkfront_info *info, int num) kfree(gnt_list_entry); goto out_of_memory; } - gnt_list_entry->pfn = page_to_pfn(granted_page); + gnt_list_entry->page = granted_page; } gnt_list_entry->gref = GRANT_INVALID_REF; @@ -234,7 +234,7 @@ out_of_memory: &info->grants, node) { list_del(&gnt_list_entry->node); if (info->feature_persistent) - __free_page(pfn_to_page(gnt_list_entry->pfn)); + __free_page(gnt_list_entry->page); kfree(gnt_list_entry); i--; } @@ -243,7 +243,7 @@ out_of_memory: } static struct grant *get_grant(grant_ref_t *gref_head, - unsigned long pfn, + struct page *page, struct blkfront_info *info) { struct grant *gnt_list_entry; @@ -263,10 +263,10 @@ static struct grant *get_grant(grant_ref_t *gref_head, gnt_list_entry->gref = gnttab_claim_grant_reference(gref_head); BUG_ON(gnt_list_entry->gref == -ENOSPC); if (!info->feature_persistent) { - BUG_ON(!pfn); - gnt_list_entry->pfn = pfn; + BUG_ON(!page); + gnt_list_entry->page = page; } - buffer_mfn = pfn_to_mfn(gnt_list_entry->pfn); + buffer_mfn = page_to_mfn(gnt_list_entry->page); gnttab_grant_foreign_access_ref(gnt_list_entry->gref, info->xbdev->otherend_id, buffer_mfn, 0); @@ -522,7 +522,7 @@ static int blkif_queue_rw_req(struct request *req) if ((ring_req->operation == BLKIF_OP_INDIRECT) && (i % SEGS_PER_INDIRECT_FRAME == 0)) { - unsigned long uninitialized_var(pfn); + struct page *uninitialized_var(page); if (segments) kunmap_atomic(segments); @@ -536,15 +536,15 @@ static int blkif_queue_rw_req(struct request *req) indirect_page = list_first_entry(&info->indirect_pages, struct page, lru); list_del(&indirect_page->lru); - pfn = page_to_pfn(indirect_page); + page = indirect_page; } - gnt_list_entry = get_grant(&gref_head, pfn, info); + gnt_list_entry = get_grant(&gref_head, page, info); info->shadow[id].indirect_grants[n] = gnt_list_entry; - segments = kmap_atomic(pfn_to_page(gnt_list_entry->pfn)); + segments = kmap_atomic(gnt_list_entry->page); ring_req->u.indirect.indirect_grefs[n] = gnt_list_entry->gref; } - gnt_list_entry = get_grant(&gref_head, page_to_pfn(sg_page(sg)), info); + gnt_list_entry = get_grant(&gref_head, sg_page(sg), info); ref = gnt_list_entry->gref; info->shadow[id].grants_used[i] = gnt_list_entry; @@ -555,7 +555,7 @@ static int blkif_queue_rw_req(struct request *req) BUG_ON(sg->offset + sg->length > PAGE_SIZE); - shared_data = kmap_atomic(pfn_to_page(gnt_list_entry->pfn)); + shared_data = kmap_atomic(gnt_list_entry->page); bvec_data = kmap_atomic(sg_page(sg)); /* @@ -1002,7 +1002,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) info->persistent_gnts_c--; } if (info->feature_persistent) - __free_page(pfn_to_page(persistent_gnt->pfn)); + __free_page(persistent_gnt->page); kfree(persistent_gnt); } } @@ -1037,7 +1037,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) persistent_gnt = info->shadow[i].grants_used[j]; gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); if (info->feature_persistent) - __free_page(pfn_to_page(persistent_gnt->pfn)); + __free_page(persistent_gnt->page); kfree(persistent_gnt); } @@ -1051,7 +1051,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) for (j = 0; j < INDIRECT_GREFS(segs); j++) { persistent_gnt = info->shadow[i].indirect_grants[j]; gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); - __free_page(pfn_to_page(persistent_gnt->pfn)); + __free_page(persistent_gnt->page); kfree(persistent_gnt); } @@ -1102,8 +1102,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info, if (bret->operation == BLKIF_OP_READ && info->feature_persistent) { for_each_sg(s->sg, sg, nseg, i) { BUG_ON(sg->offset + sg->length > PAGE_SIZE); - shared_data = kmap_atomic( - pfn_to_page(s->grants_used[i]->pfn)); + shared_data = kmap_atomic(s->grants_used[i]->page); bvec_data = kmap_atomic(sg_page(sg)); memcpy(bvec_data + sg->offset, shared_data + sg->offset, @@ -1154,7 +1153,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info, * Add the used indirect page back to the list of * available pages for indirect grefs. */ - indirect_page = pfn_to_page(s->indirect_grants[i]->pfn); + indirect_page = s->indirect_grants[i]->page; list_add(&indirect_page->lru, &info->indirect_pages); s->indirect_grants[i]->gref = GRANT_INVALID_REF; list_add_tail(&s->indirect_grants[i]->node, &info->grants);
All the usage of the field pfn are done using the same idiom: pfn_to_page(grant->pfn) This will return always the same page. Store directly the page in the grant to clean up the code. Signed-off-by: Julien Grall <julien.grall@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Roger Pau Monné <roger.pau@citrix.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> --- Changes in v2: - Patch added --- drivers/block/xen-blkfront.c | 37 ++++++++++++++++++------------------- 1 file changed, 18 insertions(+), 19 deletions(-)