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AJvYcCXYHDIMonbd7NMHARkCO3ZF2rCqAkLq2tNuIePXxAPw7gos+anHXz5UVTnb6Td98TTCavaZnQbmUy7hXRw=@vger.kernel.org X-Gm-Message-State: AOJu0YzR2H9DIqmlCbNSzXnsaCnPlyHci5eahp2/MDtngO+RHTvcTd8B 8yDP6Ig+8mwNHz+sJbDqwvYXLcmVzuna9DoH60d53LHdzI5YEluG9LJuVyeuk0U= X-Google-Smtp-Source: AGHT+IF23h3rP35OdQrEVkqc47eRF5yl1OaSv9GaxlcrSNP3KudzCHntUQv44MhoMobTuNvYO7e7Lw== X-Received: by 2002:a2e:71a:0:b0:2ec:637a:c212 with SMTP id 38308e7fff4ca-2f4f493a108mr65127501fa.39.1724678248005; Mon, 26 Aug 2024 06:17:28 -0700 (PDT) Received: from pathway.suse.cz ([193.86.92.181]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5c044ddc6basm5590989a12.12.2024.08.26.06.17.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Aug 2024 06:17:27 -0700 (PDT) Date: Mon, 26 Aug 2024 15:17:26 +0200 From: Petr Mladek To: Ira Weiny Cc: Dave Jiang , Fan Ni , Jonathan Cameron , Navneet Singh , Chris Mason , Josef Bacik , David Sterba , Steven Rostedt , Andy Shevchenko , Rasmus Villemoes , Sergey Senozhatsky , Jonathan Corbet , Andrew Morton , Dan Williams , Davidlohr Bueso , Alison Schofield , Vishal Verma , linux-btrfs@vger.kernel.org, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, nvdimm@lists.linux.dev Subject: Re: [PATCH v3 02/25] printk: Add print format (%par) for struct range Message-ID: References: <20240816-dcd-type2-upstream-v3-0-7c9b96cba6d7@intel.com> <20240816-dcd-type2-upstream-v3-2-7c9b96cba6d7@intel.com> <66c77b1c5c65c_1719d2940@iweiny-mobl.notmuch> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <66c77b1c5c65c_1719d2940@iweiny-mobl.notmuch> On Thu 2024-08-22 12:53:32, Ira Weiny wrote: > Petr Mladek wrote: > > On Fri 2024-08-16 09:44:10, Ira Weiny wrote: > > > The use of struct range in the CXL subsystem is growing. In particular, > > > the addition of Dynamic Capacity devices uses struct range in a number > > > of places which are reported in debug and error messages. > > > > > > To wit requiring the printing of the start/end fields in each print > > > became cumbersome. Dan Williams mentions in [1] that it might be time > > > to have a print specifier for struct range similar to struct resource > > > > > > A few alternatives were considered including '%pn' for 'print raNge' but > > > %par follows that struct range is most often used to store a range of > > > physical addresses. So use '%par' for 'print address range'. > > > > > > diff --git a/lib/vsprintf.c b/lib/vsprintf.c > > > index 2d71b1115916..c132178fac07 100644 > > > --- a/lib/vsprintf.c > > > +++ b/lib/vsprintf.c > > > @@ -1140,6 +1140,39 @@ char *resource_string(char *buf, char *end, struct resource *res, > > > return string_nocheck(buf, end, sym, spec); > > > } > > > > > > +static noinline_for_stack > > > +char *range_string(char *buf, char *end, const struct range *range, > > > + struct printf_spec spec, const char *fmt) > > > +{ > > > +#define RANGE_PRINTK_SIZE 16 > > > +#define RANGE_DECODED_BUF_SIZE ((2 * sizeof(struct range)) + 4) > > > +#define RANGE_PRINT_BUF_SIZE sizeof("[range - ]") [...] > > > + static const struct printf_spec range_spec = { > > > + .base = 16, > > > + .field_width = RANGE_PRINTK_SIZE, > > However, my testing indicates this needs to be. > > .field_width = 18, /* 2 (0x) + 2 * 8 (bytes) */ Makes sense. Great catch! > ... to properly zero pad the value. Does that make sense? > > > > + .precision = -1, > > > + .flags = SPECIAL | SMALL | ZEROPAD, > > > + }; > > > + > > > + *p++ = '['; > > > + p = string_nocheck(p, pend, "range ", str_spec); > > > + p = number(p, pend, range->start, range_spec); > > > + *p++ = '-'; > > > + p = number(p, pend, range->end, range_spec); > > > + *p++ = ']'; > > > + *p = '\0'; Best Regards, Petr