On Sat, 28 Jan 2017 12:13:10 +0100 Helge Deller <del...@gmx.de> wrote:
> The prctl(PR_GET_ENDIAN) syscall was added to Kernel 2.6.18, but > implemented for PowerPC only. > This trivial patch adds support for this syscall for all other architectures. Seems reasonable. I guess. Why is this needed? The man page will need updating. It says "PowerPC only". > > diff --git a/kernel/sys.c b/kernel/sys.c > index 842914e..5818e5e 100644 > --- a/kernel/sys.c > +++ b/kernel/sys.c > @@ -79,9 +79,6 @@ > #ifndef GET_FPEXC_CTL > # define GET_FPEXC_CTL(a, b) (-EINVAL) > #endif > -#ifndef GET_ENDIAN > -# define GET_ENDIAN(a, b) (-EINVAL) > -#endif > #ifndef SET_ENDIAN > # define SET_ENDIAN(a, b) (-EINVAL) > #endif > @@ -2136,7 +2133,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, > arg2, unsigned long, arg3, > return -EFAULT; > break; > case PR_GET_ENDIAN: > +#ifdef GET_ENDIAN > error = GET_ENDIAN(me, arg2); > +#elif defined(__BIG_ENDIAN) > + error = put_user(PR_ENDIAN_BIG, (unsigned int __user *)arg2); > +#else > + error = put_user(PR_ENDIAN_LITTLE, (unsigned int __user *)arg2); > +#endif > break; > case PR_SET_ENDIAN: > error = SET_ENDIAN(me, arg2);
