linux-kernel - Re: [PATCH v2 8/8] staging: vchiq_core: fix quoted strings split across lines

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Date:   Sun, 24 Oct 2021 16:56:55 -0700
From:   Joe Perches <joe@...ches.com>
To:     Gaston Gonzalez <gascoar@...il.com>, linux-staging@...ts.linux.dev
Cc:     gregkh@...uxfoundation.org, nsaenz@...nel.org,
        stefan.wahren@...e.com, arnd@...db.de, dan.carpenter@...cle.com,
        ojaswin98@...il.com, amarjargal16@...il.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 8/8] staging: vchiq_core: fix quoted strings split
 across lines

On Sun, 2021-10-24 at 18:38 -0300, Gaston Gonzalez wrote:
> Quoted strings should not be split across lines. As put it in [1]:
> "never break user-visible strings such as printk messages because that
> breaks the ability to grep for them."
> 
> While at it, fix the alignment of the arguments in the sentence.
> 
> Note: this introduce a checkpatch CHECK: line length of 123 exceeds 100
> columns, as the line now is:
> 
>  vchiq_loud_error("%d: service %d (%c%c%c%c) version mismatch - local (%d, min %d) vs. remote (%d, min %d)",
> 
> But now the string is grep-able and the whole function call more
> clear.

IMO: All of these should be changed

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h:#define VCHIQ_LOG_PREFIX   KERN_INFO "vchiq: "
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#ifndef vchiq_log_error
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#define vchiq_log_error(cat, fmt, ...) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h- do { if (cat >= VCHIQ_LOG_ERROR) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h:         printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#endif
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#ifndef vchiq_log_warning
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#define vchiq_log_warning(cat, fmt, ...) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h- do { if (cat >= VCHIQ_LOG_WARNING) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h:          printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#endif
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#ifndef vchiq_log_info
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#define vchiq_log_info(cat, fmt, ...) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h- do { if (cat >= VCHIQ_LOG_INFO) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h:         printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#endif
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#ifndef vchiq_log_trace
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#define vchiq_log_trace(cat, fmt, ...) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h- do { if (cat >= VCHIQ_LOG_TRACE) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h:         printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#endif
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-#define vchiq_loud_error(...) \
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h- vchiq_log_error(vchiq_core_log_level, "===== " __VA_ARGS__)
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h-

I suggest using the rather more common vchiq_err, vchiq_warn, vchiq_info
and if necessary vchiq_trace.  Also the cat >= test is unnecessary and
this should just use the more common standard logging facilities.

vchiq_loud_error is IMO unnecessary.

Also several of the uses of these macros already have '\n' terminations
so that just adds unnecessary blank lines in the logging.