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Date: Mon, 5 Jun 2023 15:55:34 +0200
From: Janosch Frank <frankja@...ux.ibm.com>
To: Steffen Eiden <seiden@...ux.ibm.com>, kvm@...r.kernel.org,
linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
Viktor Mihajlovski <mihajlov@...ux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@...ux.ibm.com>,
Nico Boehr <nrb@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Hendrik Brueckner <brueckner@...ux.ibm.com>
Subject: Re: [PATCH v2 5/6] s390/uv: replace scnprintf with sysfs_emit
On 5/19/23 11:37, Steffen Eiden wrote:
> Replace scnprintf(page, PAGE_SIZE, ...) with the page size aware
> sysfs_emit(page, ...) which adds some sanity checks.
>
> Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>
> ---
> arch/s390/kernel/uv.c | 36 +++++++++++++++---------------------
> 1 file changed, 15 insertions(+), 21 deletions(-)
>
> diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
> index cb2ee06df286..d5b5d7e83c17 100644
> --- a/arch/s390/kernel/uv.c
> +++ b/arch/s390/kernel/uv.c
> @@ -462,11 +462,11 @@ EXPORT_SYMBOL_GPL(arch_make_page_accessible);
> static ssize_t uv_query_facilities(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
The last argument is called buf so let's also change that over to make
all of the functions look the same.
> {
> - return scnprintf(page, PAGE_SIZE, "%lx\n%lx\n%lx\n%lx\n",
> - uv_info.inst_calls_list[0],
> - uv_info.inst_calls_list[1],
> - uv_info.inst_calls_list[2],
> - uv_info.inst_calls_list[3]);
> + return sysfs_emit(page, "%lx\n%lx\n%lx\n%lx\n",
> + uv_info.inst_calls_list[0],
> + uv_info.inst_calls_list[1],
> + uv_info.inst_calls_list[2],
> + uv_info.inst_calls_list[3]);
> }
>
> static struct kobj_attribute uv_query_facilities_attr =
> @@ -493,8 +493,7 @@ static struct kobj_attribute uv_query_supp_se_hdr_pcf_attr =
> static ssize_t uv_query_dump_cpu_len(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%lx\n",
> - uv_info.guest_cpu_stor_len);
> + return sysfs_emit(page, "%lx\n", uv_info.guest_cpu_stor_len);
> }
>
> static struct kobj_attribute uv_query_dump_cpu_len_attr =
> @@ -503,8 +502,7 @@ static struct kobj_attribute uv_query_dump_cpu_len_attr =
> static ssize_t uv_query_dump_storage_state_len(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%lx\n",
> - uv_info.conf_dump_storage_state_len);
> + return sysfs_emit(page, "%lx\n", uv_info.conf_dump_storage_state_len);
> }
>
> static struct kobj_attribute uv_query_dump_storage_state_len_attr =
> @@ -513,8 +511,7 @@ static struct kobj_attribute uv_query_dump_storage_state_len_attr =
> static ssize_t uv_query_dump_finalize_len(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%lx\n",
> - uv_info.conf_dump_finalize_len);
> + return sysfs_emit(page, "%lx\n", uv_info.conf_dump_finalize_len);
> }
>
> static struct kobj_attribute uv_query_dump_finalize_len_attr =
> @@ -532,8 +529,7 @@ static struct kobj_attribute uv_query_feature_indications_attr =
> static ssize_t uv_query_max_guest_cpus(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%d\n",
> - uv_info.max_guest_cpu_id + 1);
> + return sysfs_emit(page, "%d\n", uv_info.max_guest_cpu_id + 1);
> }
>
> static struct kobj_attribute uv_query_max_guest_cpus_attr =
> @@ -542,8 +538,7 @@ static struct kobj_attribute uv_query_max_guest_cpus_attr =
> static ssize_t uv_query_max_guest_vms(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%d\n",
> - uv_info.max_num_sec_conf);
> + return sysfs_emit(page, "%d\n", uv_info.max_num_sec_conf);
> }
>
> static struct kobj_attribute uv_query_max_guest_vms_attr =
> @@ -552,8 +547,7 @@ static struct kobj_attribute uv_query_max_guest_vms_attr =
> static ssize_t uv_query_max_guest_addr(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%lx\n",
> - uv_info.max_sec_stor_addr);
> + return sysfs_emit(page, "%lx\n", uv_info.max_sec_stor_addr);
> }
>
> static struct kobj_attribute uv_query_max_guest_addr_attr =
> @@ -562,7 +556,7 @@ static struct kobj_attribute uv_query_max_guest_addr_attr =
> static ssize_t uv_query_supp_att_req_hdr_ver(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%lx\n", uv_info.supp_att_req_hdr_ver);
> + return sysfs_emit(page, "%lx\n", uv_info.supp_att_req_hdr_ver);
> }
>
> static struct kobj_attribute uv_query_supp_att_req_hdr_ver_attr =
> @@ -571,7 +565,7 @@ static struct kobj_attribute uv_query_supp_att_req_hdr_ver_attr =
> static ssize_t uv_query_supp_att_pflags(struct kobject *kobj,
> struct kobj_attribute *attr, char *page)
> {
> - return scnprintf(page, PAGE_SIZE, "%lx\n", uv_info.supp_att_pflags);
> + return sysfs_emit(page, "%lx\n", uv_info.supp_att_pflags);
> }
>
> static struct kobj_attribute uv_query_supp_att_pflags_attr =
> @@ -605,7 +599,7 @@ static ssize_t uv_is_prot_virt_guest(struct kobject *kobj,
> #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
> val = prot_virt_guest;
> #endif
> - return scnprintf(page, PAGE_SIZE, "%d\n", val);
> + return sysfs_emit(page, "%d\n", val);
> }
>
> static ssize_t uv_is_prot_virt_host(struct kobject *kobj,
> @@ -617,7 +611,7 @@ static ssize_t uv_is_prot_virt_host(struct kobject *kobj,
> val = prot_virt_host;
> #endif
>
> - return scnprintf(page, PAGE_SIZE, "%d\n", val);
> + return sysfs_emit(page, "%d\n", val);
> }
>
> static struct kobj_attribute uv_prot_virt_guest =
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