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SubjectRe: [PATCH] drm: Reduce object size of DRM_ERROR and DRM_DEBUG uses
On Tue, Mar 13, 2018 at 03:02:15PM -0700, Joe Perches wrote:
> drm_printk is used for both DRM_ERROR and DRM_DEBUG with unnecessary
> arguments that can be removed by creating separate functins.
>
> Create specific functions for these calls to reduce x86/64 defconfig
> size by ~20k.
>
> Modify the existing macros to use the specific calls.
>
> new:
> $ size -t drivers/gpu/drm/built-in.a | tail -1
> 1876562 44542 995 1922099 1d5433 (TOTALS)
>
> old:
> $ size -t drivers/gpu/drm/built-in.a | tail -1
> 1897565 44542 995 1943102 1da63e (TOTALS)
>
> Miscellanea:
>
> o intel_display requires a change to use the specific calls.

How much would we lose if we move the (drm_debug&FOO) outside the
functions again? I'm somewhat concerned about all the function call
overhead when debugs aren't even enabled.

>
> Signed-off-by: Joe Perches <joe@perches.com>
> ---
> drivers/gpu/drm/drm_print.c | 28 +++++++++++++++++++++-------
> drivers/gpu/drm/i915/intel_display.c | 15 ++++-----------
> include/drm/drm_print.h | 27 ++++++++++++++-------------
> 3 files changed, 39 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index 781518fd88e3..79abf6d5b4db 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -89,23 +89,37 @@ void drm_dev_printk(const struct device *dev, const char *level,
> }
> EXPORT_SYMBOL(drm_dev_printk);
>
> -void drm_printk(const char *level, unsigned int category,
> - const char *format, ...)
> +void drm_dbg(unsigned int category, const char *format, ...)
> {
> struct va_format vaf;
> va_list args;
>
> - if (category != DRM_UT_NONE && !(drm_debug & category))
> + if (!(drm_debug & category))
> return;
>
> va_start(args, format);
> vaf.fmt = format;
> vaf.va = &args;
>
> - printk("%s" "[" DRM_NAME ":%ps]%s %pV",
> - level, __builtin_return_address(0),
> - strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf);
> + printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
> + __builtin_return_address(0), &vaf);
> +
> + va_end(args);
> +}
> +EXPORT_SYMBOL(drm_dbg);
> +
> +void drm_err(const char *format, ...)
> +{
> + struct va_format vaf;
> + va_list args;
> +
> + va_start(args, format);
> + vaf.fmt = format;
> + vaf.va = &args;
> +
> + printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
> + __builtin_return_address(0), &vaf);
>
> va_end(args);
> }
> -EXPORT_SYMBOL(drm_printk);
> +EXPORT_SYMBOL(drm_err);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 2933ad38094f..d8e522e3cd39 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11059,24 +11059,17 @@ intel_compare_link_m_n(const struct intel_link_m_n *m_n,
> static void __printf(3, 4)
> pipe_config_err(bool adjust, const char *name, const char *format, ...)
> {
> - char *level;
> - unsigned int category;
> struct va_format vaf;
> va_list args;
>
> - if (adjust) {
> - level = KERN_DEBUG;
> - category = DRM_UT_KMS;
> - } else {
> - level = KERN_ERR;
> - category = DRM_UT_NONE;
> - }
> -
> va_start(args, format);
> vaf.fmt = format;
> vaf.va = &args;
>
> - drm_printk(level, category, "mismatch in %s %pV", name, &vaf);
> + if (adjust)
> + drm_dbg(DRM_UT_KMS, "mismatch in %s %pV", name, &vaf);
> + else
> + drm_err("mismatch in %s %pV", name, &vaf);
>
> va_end(args);
> }
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index 2a4a42e59a47..3a40c5a3a5fa 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -200,9 +200,10 @@ __printf(6, 7)
> void drm_dev_printk(const struct device *dev, const char *level,
> unsigned int category, const char *function_name,
> const char *prefix, const char *format, ...);
> -__printf(3, 4)
> -void drm_printk(const char *level, unsigned int category,
> - const char *format, ...);
> +__printf(2, 3)
> +void drm_dbg(unsigned int category, const char *format, ...);
> +__printf(1, 2)
> +void drm_err(const char *format, ...);
>
> /* Macros to make printk easier */
>
> @@ -236,7 +237,7 @@ void drm_printk(const char *level, unsigned int category,
> drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\
> fmt, ##__VA_ARGS__)
> #define DRM_ERROR(fmt, ...) \
> - drm_printk(KERN_ERR, DRM_UT_NONE, fmt, ##__VA_ARGS__)
> + drm_err(fmt, ##__VA_ARGS__)
>
> /**
> * Rate limited error output. Like DRM_ERROR() but won't flood the log.
> @@ -279,40 +280,40 @@ void drm_printk(const char *level, unsigned int category,
> drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt, \
> ##args)
> #define DRM_DEBUG(fmt, ...) \
> - drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__)
> + drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
>
> #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...) \
> drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "", \
> fmt, ##args)
> #define DRM_DEBUG_DRIVER(fmt, ...) \
> - drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
> + drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
>
> #define DRM_DEV_DEBUG_KMS(dev, fmt, args...) \
> drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt, \
> ##args)
> -#define DRM_DEBUG_KMS(fmt, ...) \
> - drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__)
> +#define DRM_DEBUG_KMS(fmt, ...) \
> + drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
>
> #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...) \
> drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "", \
> fmt, ##args)
> #define DRM_DEBUG_PRIME(fmt, ...) \
> - drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
> + drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
>
> #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...) \
> drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "", \
> fmt, ##args)
> #define DRM_DEBUG_ATOMIC(fmt, ...) \
> - drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
> + drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
>
> #define DRM_DEV_DEBUG_VBL(dev, fmt, args...) \
> drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt, \
> ##args)
> -#define DRM_DEBUG_VBL(fmt, ...) \
> - drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__)
> +#define DRM_DEBUG_VBL(fmt, ...) \
> + drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
>
> #define DRM_DEBUG_LEASE(fmt, ...) \
> - drm_printk(KERN_DEBUG, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
> + drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
>
> #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...) \
> ({ \
> --
> 2.15.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

--
Ville Syrjälä
Intel OTC

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