Re: [PATCH] MIPS: Display CPU byteorder in /proc/cpuinfo

[David Daney <ddaney.cavm@gmail.com>]

On 01/19/2015 01:02 AM, Joshua Kinard wrote:
> From: Joshua Kinard <kumba@gentoo.org>
>
> This is a small patch to display the CPU byteorder that the kernel was compiled
> with in /proc/cpuinfo.

What would use this?  Or in other words, why is this needed?

Userspace C code doesn't need this as it has its own standard ways of 
determining endianness.

If you need to know as a user you can do:

    readelf -h /bin/sh | grep Data | cut -d, -f2


>
> Signed-off-by: Joshua Kinard <kumba@gentoo.org>
> ---
>   arch/mips/kernel/proc.c |    5 +++++
>   1 file changed, 5 insertions(+)
>
> This patch has been submitted several times prior over the years (I think), but
> I don't recall what, if any, objections there were to it.
>
> linux-mips-proc-cpuinfo-byteorder.patch
> diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
> index 097fc8d..75e6a62 100644
> --- a/arch/mips/kernel/proc.c
> +++ b/arch/mips/kernel/proc.c
> @@ -65,6 +65,11 @@ static int show_cpuinfo(struct seq_file *m, void *v)
>   	seq_printf(m, "BogoMIPS\t\t: %u.%02u\n",
>   		      cpu_data[n].udelay_val / (500000/HZ),
>   		      (cpu_data[n].udelay_val / (5000/HZ)) % 100);
> +#ifdef __MIPSEB__
> +	seq_printf(m, "byteorder\t\t: big endian\n");
> +#else
> +	seq_printf(m, "byteorder\t\t: little endian\n");
> +#endif
>   	seq_printf(m, "wait instruction\t: %s\n", cpu_wait ? "yes" : "no");
>   	seq_printf(m, "microsecond timers\t: %s\n",
>   		      cpu_has_counter ? "yes" : "no");
>
>
>